diff --git a/docs/providers.md b/docs/providers.md
index 6e3c39150..d491d082b 100644
--- a/docs/providers.md
+++ b/docs/providers.md
@@ -14,9 +14,15 @@ The only built-in ACP provider today is `copilot` (`copilot-acp-agent.ts`). `Gen
 
 Implement the `AgentClient` and `AgentSession` interfaces from `agent-sdk-types.ts` yourself. This gives full control but requires you to handle process management, streaming, permissions, and session persistence from scratch.
 
-Existing direct providers: `claude` (in `providers/claude/agent.ts`), `codex` (`codex-app-server-agent.ts`), `opencode` (`opencode-agent.ts`), `pi` (`pi-direct-agent.ts`). The dev-only `mock` provider (`mock-load-test-agent.ts`) is also direct.
+Existing direct providers: `claude` (in `providers/claude/agent.ts`), `codex` (`codex-app-server-agent.ts`), `opencode` (`opencode-agent.ts`), `pi` (`providers/pi/agent.ts`). The dev-only `mock` provider (`mock-load-test-agent.ts`) is also direct.
 
-Pi direct embeds Pi's SDK through the `@earendil-works/pi-*` packages. Keep those dependencies in sync with the Pi package-manager behavior expected by current user installs: Pi 0.75+ loads user-scoped npm packages from `~/.pi/agent/npm/`, while older `@mariozechner/pi-coding-agent` releases looked in npm's global package root and can miss or load stale extensions.
+Pi is a process-backed provider. Paseo requires the user to have the `pi` binary installed and talks to it through `pi --mode rpc`; the server package does not embed Pi's SDK/runtime packages.
+
+Paseo's per-agent and daemon-wide system prompts are passed to Pi with `--append-system-prompt`, so Pi keeps its default coding prompt while receiving Paseo's additional instructions.
+
+Pi MCP support depends on the open-source `pi-mcp-adapter` extension being loaded for the agent cwd. Probe with Pi RPC `get_commands`; the adapter registers an extension command named `mcp` (often with `sourceInfo.source` containing `pi-mcp-adapter`). When Paseo injects MCP servers into Pi, write a per-agent MCP config and pass it with `--mcp-config` instead of modifying user or project MCP files. For local HTTP servers such as Paseo's own `/mcp/agents` endpoint, explicitly disable adapter OAuth (`auth: false`, `oauth: false`) in the generated config.
+
+Pi import discovery reads Pi's persisted JSONL session files because Pi RPC does not expose a recent-session listing command. Resume and full history hydration still go through `pi --mode rpc` using the session file as `nativeHandle`.
 
 Draft metadata lookups should avoid creating provider sessions when the upstream provider has top-level APIs for that metadata. Prefer `AgentClient.listModels`, `listModes`, `listCommands`, or `listFeatures` over creating a scratch `AgentSession`; scratch sessions can show up as empty native sessions in provider import/history UIs.
 
diff --git a/package-lock.json b/package-lock.json
index d165c1f36..b8cc87493 100644
--- a/package-lock.json
+++ b/package-lock.json
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-      "resolved": "https://registry.npmjs.org/marked/-/marked-15.0.12.tgz",
-      "integrity": "sha512-8dD6FusOQSrpv9Z1rdNMdlSgQOIP880DHqnohobOmYLElGEqAL/JvxvuxZO16r4HtjTlfPRDC1hbvxC9dPN2nA==",
-      "license": "MIT",
-      "bin": {
-        "marked": "bin/marked.js"
-      },
-      "engines": {
-        "node": ">= 18"
-      }
-    },
     "node_modules/marky": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/marky/-/marky-1.3.0.tgz",
@@ -30859,28 +29488,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/p-retry": {
-      "version": "4.6.2",
-      "resolved": "https://registry.npmjs.org/p-retry/-/p-retry-4.6.2.tgz",
-      "integrity": "sha512-312Id396EbJdvRONlngUx0NydfrIQ5lsYu0znKVUzVvArzEIt08V1qhtyESbGVd1FGX7UKtiFp5uwKZdM8wIuQ==",
-      "license": "MIT",
-      "dependencies": {
-        "@types/retry": "0.12.0",
-        "retry": "^0.13.1"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "node_modules/p-retry/node_modules/retry": {
-      "version": "0.13.1",
-      "resolved": "https://registry.npmjs.org/retry/-/retry-0.13.1.tgz",
-      "integrity": "sha512-XQBQ3I8W1Cge0Seh+6gjj03LbmRFWuoszgK9ooCpwYIrhhoO80pfq4cUkU5DkknwfOfFteRwlZ56PYOGYyFWdg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 4"
-      }
-    },
     "node_modules/p-try": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
@@ -31046,12 +29653,6 @@
         "node": ">= 0.8"
       }
     },
-    "node_modules/partial-json": {
-      "version": "0.1.7",
-      "resolved": "https://registry.npmjs.org/partial-json/-/partial-json-0.1.7.tgz",
-      "integrity": "sha512-Njv/59hHaokb/hRUjce3Hdv12wd60MtM9Z5Olmn+nehe0QDAsRtRbJPvJ0Z91TusF0SuZRIvnM+S4l6EIP8leA==",
-      "license": "MIT"
-    },
     "node_modules/password-prompt": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/password-prompt/-/password-prompt-1.1.3.tgz",
@@ -31102,21 +29703,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/path-expression-matcher": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/path-expression-matcher/-/path-expression-matcher-1.5.0.tgz",
-      "integrity": "sha512-cbrerZV+6rvdQrrD+iGMcZFEiiSrbv9Tfdkvnusy6y0x0GKBXREFg/Y65GhIfm0tnLntThhzCnfKwp1WRjeCyQ==",
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/NaturalIntelligence"
-        }
-      ],
-      "license": "MIT",
-      "engines": {
-        "node": ">=14.0.0"
-      }
-    },
     "node_modules/path-is-absolute": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
@@ -31723,6 +30309,7 @@
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/proper-lockfile/-/proper-lockfile-4.1.2.tgz",
       "integrity": "sha512-TjNPblN4BwAWMXU8s9AEz4JmQxnD1NNL7bNOY/AKUzyamc379FWASUhc/K1pL2noVb+XmZKLL68cjzLsiOAMaA==",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "graceful-fs": "^4.2.4",
@@ -31734,6 +30321,7 @@
       "version": "3.0.7",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",
       "integrity": "sha512-wnD2ZE+l+SPC/uoS0vXeE9L1+0wuaMqKlfz9AMUo38JsyLSBWSFcHR1Rri62LZc12vLr1gb3jl7iwQhgwpAbGQ==",
+      "dev": true,
       "license": "ISC"
     },
     "node_modules/property-information": {
@@ -31746,30 +30334,6 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
-    "node_modules/protobufjs": {
-      "version": "7.6.0",
-      "resolved": "https://registry.npmjs.org/protobufjs/-/protobufjs-7.6.0.tgz",
-      "integrity": "sha512-LtESOsMPTZgyYtwxhvdgdjGL0HmXEaRA/hVD6sol4zA60hVXXXP/SGmxnqDbgGE8gy7pYex7cym+5vYPcmaXBQ==",
-      "hasInstallScript": true,
-      "license": "BSD-3-Clause",
-      "dependencies": {
-        "@protobufjs/aspromise": "^1.1.2",
-        "@protobufjs/base64": "^1.1.2",
-        "@protobufjs/codegen": "^2.0.5",
-        "@protobufjs/eventemitter": "^1.1.0",
-        "@protobufjs/fetch": "^1.1.1",
-        "@protobufjs/float": "^1.0.2",
-        "@protobufjs/inquire": "^1.1.2",
-        "@protobufjs/path": "^1.1.2",
-        "@protobufjs/pool": "^1.1.0",
-        "@protobufjs/utf8": "^1.1.1",
-        "@types/node": ">=13.7.0",
-        "long": "^5.3.2"
-      },
-      "engines": {
-        "node": ">=12.0.0"
-      }
-    },
     "node_modules/proxy-addr": {
       "version": "2.0.7",
       "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
@@ -33395,6 +31959,7 @@
       "version": "0.12.0",
       "resolved": "https://registry.npmjs.org/retry/-/retry-0.12.0.tgz",
       "integrity": "sha512-9LkiTwjUh6rT555DtE9rTX+BKByPfrMzEAtnlEtdEwr3Nkffwiihqe2bWADg+OQRjt9gl6ICdmB/ZFDCGAtSow==",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">= 4"
@@ -35051,18 +33616,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/strnum": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.3.0.tgz",
-      "integrity": "sha512-ums3KNd42PGyx5xaoVTO1mjU1bH3NpY4vsrVlnv9PNGqQj8wd7rJ6nEypLrJ7z5vxK5RP0yMLo6J/Gsm62DI5Q==",
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/NaturalIntelligence"
-        }
-      ],
-      "license": "MIT"
-    },
     "node_modules/structured-headers": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/structured-headers/-/structured-headers-0.4.1.tgz",
@@ -36113,12 +34666,6 @@
         "node": ">= 0.6"
       }
     },
-    "node_modules/typebox": {
-      "version": "1.1.38",
-      "resolved": "https://registry.npmjs.org/typebox/-/typebox-1.1.38.tgz",
-      "integrity": "sha512-pZ0aQPmMmXoUvSbeuWf/Hzsc+avNw/Zd6VeE8CFgkVGWyuHPJvqeJJDeJqLve+K70LvjYIoleGcoJHPT17cWoA==",
-      "license": "MIT"
-    },
     "node_modules/typed-array-buffer": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/typed-array-buffer/-/typed-array-buffer-1.0.3.tgz",
@@ -37657,21 +36204,6 @@
         "node": ">=12"
       }
     },
-    "node_modules/xml-naming": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/xml-naming/-/xml-naming-0.1.0.tgz",
-      "integrity": "sha512-k8KO9hrMyNk6tUWqUfkTEZbezRRpONVOzUTnc97VnCvyj6Tf9lyUR9EDAIeiVLv56jsMcoXEwjW8Kv5yPY52lw==",
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/NaturalIntelligence"
-        }
-      ],
-      "license": "MIT",
-      "engines": {
-        "node": ">=16.0.0"
-      }
-    },
     "node_modules/xml-reader": {
       "version": "2.4.3",
       "resolved": "https://registry.npmjs.org/xml-reader/-/xml-reader-2.4.3.tgz",
@@ -38268,9 +36800,6 @@
       "dependencies": {
         "@agentclientprotocol/sdk": "^0.17.1",
         "@anthropic-ai/claude-agent-sdk": "^0.2.133",
-        "@earendil-works/pi-agent-core": "^0.75.3",
-        "@earendil-works/pi-ai": "^0.75.3",
-        "@earendil-works/pi-coding-agent": "^0.75.3",
         "@getpaseo/highlight": "0.1.78",
         "@getpaseo/relay": "0.1.78",
         "@isaacs/ttlcache": "^2.1.4",
diff --git a/packages/cli/src/commands/agent/import.test.ts b/packages/cli/src/commands/agent/import.test.ts
index 28fef48d5..48a678de4 100644
--- a/packages/cli/src/commands/agent/import.test.ts
+++ b/packages/cli/src/commands/agent/import.test.ts
@@ -1,5 +1,16 @@
-import { describe, expect, it } from "vitest";
-import { resolveImportCwd } from "./import.js";
+import { describe, expect, it, vi } from "vitest";
+import { resolveImportCwd, runImportCommand } from "./import.js";
+
+const importAgent = vi.fn();
+const close = vi.fn();
+
+vi.mock("../../utils/client.js", () => ({
+  connectToDaemon: vi.fn(async () => ({
+    importAgent,
+    close,
+  })),
+  getDaemonHost: vi.fn(() => "ws://127.0.0.1:6767"),
+}));
 
 describe("resolveImportCwd", () => {
   it("uses the invoking process cwd when --cwd is omitted", () => {
@@ -19,4 +30,30 @@ describe("resolveImportCwd", () => {
       }),
     );
   });
+
+  it("accepts pi as an import provider", async () => {
+    importAgent.mockResolvedValueOnce({
+      id: "agent-1",
+      status: "idle",
+      provider: "pi",
+      cwd: "/tmp/project",
+      title: "Imported Pi session",
+    });
+
+    const result = await runImportCommand(
+      "pi-session-1",
+      {
+        provider: "pi",
+        cwd: "/tmp/project",
+      },
+      {} as never,
+    );
+
+    expect(importAgent).toHaveBeenCalledWith({
+      provider: "pi",
+      sessionId: "pi-session-1",
+      cwd: "/tmp/project",
+    });
+    expect(result.data.provider).toBe("pi");
+  });
 });
diff --git a/packages/cli/src/commands/agent/import.ts b/packages/cli/src/commands/agent/import.ts
index 9bd7d1507..32f99623a 100644
--- a/packages/cli/src/commands/agent/import.ts
+++ b/packages/cli/src/commands/agent/import.ts
@@ -5,13 +5,15 @@ import type { CommandError, CommandOptions, SingleResult } from "../../output/in
 import { agentRunSchema, type AgentRunResult } from "./run.js";
 import type { AgentSnapshotPayload } from "@getpaseo/server";
 
-const IMPORT_PROVIDERS = new Set(["claude", "codex", "opencode", "acp"]);
+const IMPORT_PROVIDER_LIST = ["claude", "codex", "opencode", "pi", "acp"] as const;
+const IMPORT_PROVIDERS = new Set<string>(IMPORT_PROVIDER_LIST);
+const IMPORT_PROVIDER_HELP = IMPORT_PROVIDER_LIST.join(", ");
 
 export function addImportOptions(cmd: Command): Command {
   return cmd
     .description("Import an existing provider session as a Paseo agent")
     .argument("<id>", "Provider session/thread ID to import")
-    .requiredOption("--provider <provider>", "Agent provider: claude, codex, opencode, or acp")
+    .requiredOption("--provider <provider>", `Agent provider: ${IMPORT_PROVIDER_HELP}`)
     .option("--cwd <path>", "Working directory for providers that require it")
     .option(
       "--label <key=value>",
@@ -54,7 +56,7 @@ function parseImportProvider(provider: string | undefined): string {
     throw {
       code: "INVALID_PROVIDER",
       message: `Unsupported provider: ${normalizedProvider}`,
-      details: "Supported providers: claude, codex, opencode, acp",
+      details: `Supported providers: ${IMPORT_PROVIDER_HELP}`,
     } satisfies CommandError;
   }
 
diff --git a/packages/server/package.json b/packages/server/package.json
index d3832ba9a..09137073f 100644
--- a/packages/server/package.json
+++ b/packages/server/package.json
@@ -63,9 +63,6 @@
   "dependencies": {
     "@agentclientprotocol/sdk": "^0.17.1",
     "@anthropic-ai/claude-agent-sdk": "^0.2.133",
-    "@earendil-works/pi-agent-core": "^0.75.3",
-    "@earendil-works/pi-ai": "^0.75.3",
-    "@earendil-works/pi-coding-agent": "^0.75.3",
     "@getpaseo/highlight": "0.1.78",
     "@getpaseo/relay": "0.1.78",
     "@isaacs/ttlcache": "^2.1.4",
diff --git a/packages/server/src/server/agent/agent-manager.test.ts b/packages/server/src/server/agent/agent-manager.test.ts
index 384b81c0a..b22cbffee 100644
--- a/packages/server/src/server/agent/agent-manager.test.ts
+++ b/packages/server/src/server/agent/agent-manager.test.ts
@@ -425,7 +425,7 @@ test("createAgent injects daemon append system prompt at runtime only", async ()
   expect(record?.config).not.toHaveProperty("daemonAppendSystemPrompt");
 });
 
-test("daemon append system prompt is not injected into Pi", async () => {
+test("daemon append system prompt is injected into Pi configs", async () => {
   const workdir = mkdtempSync(join(tmpdir(), "agent-manager-test-"));
   const storagePath = join(workdir, "agents");
   const storage = new AgentStorage(storagePath, logger);
@@ -449,7 +449,7 @@ test("daemon append system prompt is not injected into Pi", async () => {
     systemPrompt: "Agent instructions.",
   });
 
-  expect(client.createdConfigs[0]?.daemonAppendSystemPrompt).toBeUndefined();
+  expect(client.createdConfigs[0]?.daemonAppendSystemPrompt).toBe("Daemon instructions.");
 });
 
 test("setAgentMode persists the selected mode across session reload", async () => {
diff --git a/packages/server/src/server/agent/agent-manager.ts b/packages/server/src/server/agent/agent-manager.ts
index d13ac0e72..3c3a95d79 100644
--- a/packages/server/src/server/agent/agent-manager.ts
+++ b/packages/server/src/server/agent/agent-manager.ts
@@ -1073,6 +1073,7 @@ export class AgentManager {
     }
 
     const { archivedAt } = await this.markRecordArchived(stored);
+    agent.updatedAt = new Date(archivedAt);
     await this.closeAgent(agentId);
 
     await this.cascadeArchiveChildren(agentId);
@@ -3456,23 +3457,16 @@ export class AgentManager {
   }
 
   private applyDaemonAppendSystemPrompt(config: AgentSessionConfig): AgentSessionConfig {
-    if (config.provider === "pi") {
-      const next = { ...config };
-      delete next.daemonAppendSystemPrompt;
-      return next;
-    }
+    const daemonAppendSystemPrompt = this.appendSystemPrompt.trim();
+    const next = { ...config };
+    delete next.daemonAppendSystemPrompt;
 
-    const trimmed = this.appendSystemPrompt.trim();
-    if (!trimmed) {
-      const next = { ...config };
-      delete next.daemonAppendSystemPrompt;
-      return next;
-    }
-
-    return {
-      ...config,
-      daemonAppendSystemPrompt: trimmed,
-    };
+    return daemonAppendSystemPrompt
+      ? {
+          ...next,
+          daemonAppendSystemPrompt,
+        }
+      : next;
   }
 
   private buildLaunchContext(agentId: string): AgentLaunchContext {
diff --git a/packages/server/src/server/agent/import-sessions.test.ts b/packages/server/src/server/agent/import-sessions.test.ts
index f46f26f95..91584ac61 100644
--- a/packages/server/src/server/agent/import-sessions.test.ts
+++ b/packages/server/src/server/agent/import-sessions.test.ts
@@ -1,4 +1,7 @@
 import { beforeEach, expect, test, vi } from "vitest";
+import { mkdirSync, mkdtempSync, realpathSync, symlinkSync } from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
 import type { AgentManager, ManagedAgent } from "./agent-manager.js";
 import type { AgentStorage, StoredAgentRecord } from "./agent-storage.js";
 import type { FetchRecentProviderSessionsRequestMessage } from "../../shared/messages.js";
@@ -10,6 +13,8 @@ import {
   normalizeImportAgentRequest,
 } from "./import-sessions.js";
 
+const directorySymlinkType = process.platform === "win32" ? "junction" : "dir";
+
 const TEST_CAPABILITIES = {
   supportsStreaming: true,
   supportsSessionPersistence: true,
@@ -275,6 +280,39 @@ test("listImportableProviderSessions filters out metadata generation sessions",
   expect(result.filteredAlreadyImportedCount).toBe(0);
 });
 
+test("listImportableProviderSessions keeps realpath-equivalent cwd matches", async () => {
+  const root = mkdtempSync(path.join(tmpdir(), "paseo-import-cwd-"));
+  const realCwd = path.join(root, "real-project");
+  const linkedCwd = path.join(root, "linked-project");
+  mkdirSync(realCwd, { recursive: true });
+  symlinkSync(realCwd, linkedCwd, directorySymlinkType);
+  const persistedCwd = realpathSync(linkedCwd);
+
+  const result = await listImportableProviderSessions({
+    request: makeRequest({ cwd: linkedCwd, providers: ["pi"] }),
+    agentManager: {
+      listAgents: () => [],
+      listImportablePersistedAgents: async () => [
+        makeDescriptor({
+          provider: "pi",
+          sessionId: "pi-session",
+          nativeHandle: "pi-handle",
+          cwd: persistedCwd,
+          title: "Pi session",
+          lastActivityAt: "2026-04-30T12:00:00.000Z",
+          firstPrompt: "remember this",
+        }),
+      ],
+    } satisfies Pick<AgentManager, "listAgents" | "listImportablePersistedAgents">,
+    agentStorage: {
+      list: async () => [],
+    } satisfies Pick<AgentStorage, "list">,
+    providerRegistry: { pi: { label: "Pi" } },
+  });
+
+  expect(result.entries.map((entry) => entry.providerHandleId)).toEqual(["pi-handle"]);
+});
+
 test("listImportableProviderSessions rejects invalid since values", async () => {
   await expect(
     listImportableProviderSessions({
diff --git a/packages/server/src/server/agent/import-sessions.ts b/packages/server/src/server/agent/import-sessions.ts
index 9741b1418..746d42215 100644
--- a/packages/server/src/server/agent/import-sessions.ts
+++ b/packages/server/src/server/agent/import-sessions.ts
@@ -20,7 +20,7 @@ import type {
   RecentProviderSessionDescriptorPayload,
 } from "../../shared/messages.js";
 import type { WorkspaceGitService } from "../workspace-git-service.js";
-import { createPathEquivalenceMatcher } from "../../utils/path.js";
+import { createRealpathAwarePathMatcher } from "../../utils/path.js";
 
 type ImportAgentRequestMessage = z.infer<typeof ImportAgentRequestMessageSchema>;
 
@@ -112,7 +112,7 @@ export async function listImportableProviderSessions(
   });
   let filteredAlreadyImportedCount = 0;
   const candidates: PersistedAgentDescriptor[] = [];
-  const matchesRequestCwd = request.cwd ? createPathEquivalenceMatcher(request.cwd) : null;
+  const matchesRequestCwd = request.cwd ? createRealpathAwarePathMatcher(request.cwd) : null;
   for (const descriptor of descriptors) {
     if (matchesRequestCwd && !matchesRequestCwd(descriptor.cwd)) {
       continue;
diff --git a/packages/server/src/server/agent/mcp-server.test.ts b/packages/server/src/server/agent/mcp-server.test.ts
index c1f59cc8f..1c1e18d1c 100644
--- a/packages/server/src/server/agent/mcp-server.test.ts
+++ b/packages/server/src/server/agent/mcp-server.test.ts
@@ -1987,6 +1987,7 @@ describe("provider listing MCP tool", () => {
     });
     const tool = registeredTool(server, "list_providers");
     const response = await tool.handler({});
+    const modelVisibleText = String(response.content[0]?.text);
 
     expect(response.structuredContent).toEqual({
       providers: [
@@ -2008,6 +2009,9 @@ describe("provider listing MCP tool", () => {
         },
       ],
     });
+    expect(modelVisibleText).toContain("providers_count=2");
+    expect(modelVisibleText).toContain("providers_ids=claude,zai");
+    expect(modelVisibleText).toContain('"providers"');
   });
 
   it("returns disabled providers with metadata without checking availability", async () => {
diff --git a/packages/server/src/server/agent/mcp-server.ts b/packages/server/src/server/agent/mcp-server.ts
index 577e9f495..4727c654d 100644
--- a/packages/server/src/server/agent/mcp-server.ts
+++ b/packages/server/src/server/agent/mcp-server.ts
@@ -3,7 +3,11 @@ import { z } from "zod";
 import { ensureValidJson } from "../json-utils.js";
 import type { Logger } from "pino";
 import type { RequestHandlerExtra } from "@modelcontextprotocol/sdk/shared/protocol.js";
-import type { ServerNotification, ServerRequest } from "@modelcontextprotocol/sdk/types.js";
+import type {
+  CallToolResult,
+  ServerNotification,
+  ServerRequest,
+} from "@modelcontextprotocol/sdk/types.js";
 
 import type { AgentProvider } from "./agent-sdk-types.js";
 import type { AgentManager, WaitForAgentResult } from "./agent-manager.js";
@@ -154,6 +158,54 @@ function mapModeAcrossProviders(
   return sourceMode;
 }
 
+function addModelVisibleStructuredContent(result: CallToolResult): CallToolResult {
+  if (result.structuredContent === undefined || result.content.length > 0) {
+    return result;
+  }
+
+  return {
+    ...result,
+    content: [
+      {
+        type: "text",
+        text: formatStructuredContentForModel(result.structuredContent),
+      },
+    ],
+  };
+}
+
+function formatStructuredContentForModel(structuredContent: unknown): string {
+  if (
+    !structuredContent ||
+    typeof structuredContent !== "object" ||
+    Array.isArray(structuredContent)
+  ) {
+    return JSON.stringify(structuredContent, null, 2);
+  }
+
+  const record = structuredContent as Record<string, unknown>;
+  const summary: string[] = [];
+  for (const [key, value] of Object.entries(record)) {
+    if (!Array.isArray(value)) {
+      continue;
+    }
+    summary.push(`${key}_count=${value.length}`);
+    const ids = value
+      .map((item) =>
+        item && typeof item === "object" && !Array.isArray(item)
+          ? (item as Record<string, unknown>).id
+          : null,
+      )
+      .filter((id): id is string => typeof id === "string" && id.length > 0);
+    if (ids.length === value.length && ids.length > 0) {
+      summary.push(`${key}_ids=${ids.join(",")}`);
+    }
+  }
+
+  const json = JSON.stringify(structuredContent, null, 2);
+  return summary.length > 0 ? `${summary.join("\n")}\n\n${json}` : json;
+}
+
 type McpToolContext = RequestHandlerExtra<ServerRequest, ServerNotification>;
 
 function parseTimestamp(value: string | null | undefined): number {
@@ -454,6 +506,10 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     name: "agent-mcp",
     version: "2.0.0",
   });
+  const registerRawTool = server.registerTool.bind(server);
+  const registerTool: McpServer["registerTool"] = (name, config, handler) =>
+    registerRawTool(name, config, (async (args: never, extra: never) =>
+      addModelVisibleStructuredContent(await handler(args, extra))) as typeof handler);
 
   const resolveCallerAgent = () => {
     if (!callerAgentId) {
@@ -750,7 +806,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
   };
 
   if (options.voiceOnly || options.enableVoiceTools || callerContext?.enableVoiceTools) {
-    server.registerTool(
+    registerTool(
       "speak",
       {
         title: "Speak",
@@ -954,7 +1010,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     };
   };
 
-  server.registerTool(
+  registerTool(
     "create_agent",
     {
       title: "Create agent",
@@ -1099,7 +1155,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "wait_for_agent",
     {
       title: "Wait for agent",
@@ -1176,7 +1232,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "send_agent_prompt",
     {
       title: "Send agent prompt",
@@ -1277,7 +1333,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "get_agent_status",
     {
       title: "Get agent status",
@@ -1327,7 +1383,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "list_agents",
     {
       title: "List agents",
@@ -1386,7 +1442,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "cancel_agent",
     {
       title: "Cancel agent run",
@@ -1410,7 +1466,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "archive_agent",
     {
       title: "Archive agent",
@@ -1433,7 +1489,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "kill_agent",
     {
       title: "Kill agent",
@@ -1455,7 +1511,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "update_agent",
     {
       title: "Update agent",
@@ -1513,7 +1569,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "list_terminals",
     {
       title: "List terminals",
@@ -1561,7 +1617,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "create_terminal",
     {
       title: "Create terminal",
@@ -1596,7 +1652,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "kill_terminal",
     {
       title: "Kill terminal",
@@ -1627,7 +1683,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "capture_terminal",
     {
       title: "Capture terminal",
@@ -1671,7 +1727,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "send_terminal_keys",
     {
       title: "Send terminal keys",
@@ -1707,7 +1763,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "create_schedule",
     {
       title: "Create schedule",
@@ -1788,7 +1844,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "list_schedules",
     {
       title: "List schedules",
@@ -1813,7 +1869,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "inspect_schedule",
     {
       title: "Inspect schedule",
@@ -1836,7 +1892,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "pause_schedule",
     {
       title: "Pause schedule",
@@ -1861,7 +1917,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "resume_schedule",
     {
       title: "Resume schedule",
@@ -1886,7 +1942,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "delete_schedule",
     {
       title: "Delete schedule",
@@ -1911,7 +1967,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "update_schedule",
     {
       title: "Update schedule",
@@ -1973,7 +2029,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "schedule_logs",
     {
       title: "Schedule logs",
@@ -1998,7 +2054,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "list_providers",
     {
       title: "List providers",
@@ -2021,7 +2077,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "list_models",
     {
       title: "List models",
@@ -2058,7 +2114,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "inspect_provider",
     {
       title: "Inspect provider",
@@ -2122,7 +2178,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "list_worktrees",
     {
       title: "List worktrees",
@@ -2153,7 +2209,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "create_worktree",
     {
       title: "Create worktree",
@@ -2218,7 +2274,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "archive_worktree",
     {
       title: "Archive worktree",
@@ -2310,7 +2366,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "get_agent_activity",
     {
       title: "Get agent activity",
@@ -2366,7 +2422,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "set_agent_mode",
     {
       title: "Set agent session mode",
@@ -2390,7 +2446,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "list_pending_permissions",
     {
       title: "List pending permissions",
@@ -2424,7 +2480,7 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
     },
   );
 
-  server.registerTool(
+  registerTool(
     "respond_to_permission",
     {
       title: "Respond to permission",
diff --git a/packages/server/src/server/agent/provider-registry.test.ts b/packages/server/src/server/agent/provider-registry.test.ts
index c6f507b3e..9d8acc8ae 100644
--- a/packages/server/src/server/agent/provider-registry.test.ts
+++ b/packages/server/src/server/agent/provider-registry.test.ts
@@ -193,8 +193,8 @@ vi.mock("./providers/copilot-acp-agent.js", () => ({
   },
 }));
 
-vi.mock("./providers/pi-direct-agent.js", () => ({
-  PiDirectAgentClient: class PiDirectAgentClient {
+vi.mock("./providers/pi/agent.js", () => ({
+  PiRpcAgentClient: class PiRpcAgentClient {
     readonly capabilities = {
       supportsStreaming: true,
       supportsSessionPersistence: true,
diff --git a/packages/server/src/server/agent/provider-registry.ts b/packages/server/src/server/agent/provider-registry.ts
index 1af17a12d..6cc26ca85 100644
--- a/packages/server/src/server/agent/provider-registry.ts
+++ b/packages/server/src/server/agent/provider-registry.ts
@@ -29,7 +29,7 @@ import { CursorACPAgentClient } from "./providers/cursor-acp-agent.js";
 import { GenericACPAgentClient } from "./providers/generic-acp-agent.js";
 import { OpenCodeAgentClient } from "./providers/opencode-agent.js";
 import { OpenCodeServerManager } from "./providers/opencode/server-manager.js";
-import { PiDirectAgentClient } from "./providers/pi-direct-agent.js";
+import { PiRpcAgentClient } from "./providers/pi/agent.js";
 import { MockLoadTestAgentClient } from "./providers/mock-load-test-agent.js";
 import {
   AGENT_PROVIDER_DEFINITIONS,
@@ -121,7 +121,7 @@ const PROVIDER_CLIENT_FACTORIES: Record<string, ProviderClientFactory> = {
     }),
   opencode: (logger, runtimeSettings) => new OpenCodeAgentClient(logger, runtimeSettings),
   pi: (logger, runtimeSettings) =>
-    new PiDirectAgentClient({
+    new PiRpcAgentClient({
       logger,
       runtimeSettings,
     }),
diff --git a/packages/server/src/server/agent/providers/acp-agent.test.ts b/packages/server/src/server/agent/providers/acp-agent.test.ts
index b8f889c56..21b417172 100644
--- a/packages/server/src/server/agent/providers/acp-agent.test.ts
+++ b/packages/server/src/server/agent/providers/acp-agent.test.ts
@@ -36,7 +36,7 @@ import {
   transformCopilotSessionResponse,
   writeCopilotProviderMode,
 } from "./copilot-acp-agent.js";
-import { transformPiModels } from "./pi-direct-agent.js";
+import { transformPiModels } from "./pi/agent.js";
 import type { AgentStreamEvent } from "../agent-sdk-types.js";
 import { createTestLogger } from "../../../test-utils/test-logger.js";
 import { asInternals } from "../../test-utils/class-mocks.js";
diff --git a/packages/server/src/server/agent/providers/pi-direct-agent.test.ts b/packages/server/src/server/agent/providers/pi-direct-agent.test.ts
deleted file mode 100644
index 92dc2b982..000000000
--- a/packages/server/src/server/agent/providers/pi-direct-agent.test.ts
+++ /dev/null
@@ -1,373 +0,0 @@
-import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
-import { join } from "node:path";
-import { tmpdir } from "node:os";
-import { describe, expect, test, vi } from "vitest";
-import type { Api, AssistantMessage, Model } from "@earendil-works/pi-ai";
-import pino from "pino";
-
-import type { AgentStreamEvent } from "../agent-sdk-types.js";
-import {
-  PiDirectAgentClient,
-  PiDirectAgentSession,
-  type PiDirectSessionRuntimeAdapter,
-  type PiDirectSessionAdapter,
-} from "./pi-direct-agent.js";
-
-function createPiAssistantErrorMessage(errorMessage: string): AssistantMessage {
-  return {
-    role: "assistant",
-    content: [],
-    api: "openai-responses",
-    provider: "github-copilot",
-    model: "gpt-5.4",
-    usage: {
-      input: 0,
-      output: 0,
-      cacheRead: 0,
-      cacheWrite: 0,
-      totalTokens: 0,
-      cost: {
-        input: 0,
-        output: 0,
-        cacheRead: 0,
-        cacheWrite: 0,
-        total: 0,
-      },
-    },
-    stopReason: "error",
-    errorMessage,
-    timestamp: Date.now(),
-  };
-}
-
-function createPiSession(
-  prompt: () => Promise<void>,
-  options: {
-    compact?: () => Promise<void>;
-    messages?: PiDirectSessionAdapter["messages"];
-    errorMessage?: string | null;
-  } = {},
-): PiDirectSessionAdapter {
-  return {
-    sessionId: "pi-session-1",
-    thinkingLevel: "medium",
-    model: undefined,
-    messages: options.messages ?? [],
-    extensionRunner: undefined,
-    promptTemplates: [],
-    resourceLoader: {
-      getSkills: () => ({ skills: [] }),
-    },
-    agent: {
-      state: {
-        systemPrompt: "",
-        errorMessage: options.errorMessage ?? null,
-      },
-    },
-    sessionManager: {
-      getSessionFile: () => "/tmp/pi-session.json",
-      getCwd: () => "/tmp/paseo-pi-test",
-    },
-    subscribe: vi.fn(),
-    prompt,
-    compact: options.compact ?? vi.fn(async () => undefined),
-    abort: vi.fn(),
-    dispose: vi.fn(),
-    getSessionStats: vi.fn(() => ({})),
-    setModel: vi.fn(),
-    setThinkingLevel: vi.fn(),
-  };
-}
-
-function createPiRuntime(
-  session: PiDirectSessionAdapter,
-  dispose: () => Promise<void> = vi.fn(async () => undefined),
-): PiDirectSessionRuntimeAdapter {
-  return {
-    session,
-    dispose,
-  };
-}
-
-function createPiModel(provider: string, id: string): Model<Api> {
-  return {
-    provider,
-    id,
-    name: id,
-    api: "openai-completions",
-    baseUrl: "https://example.invalid/v1",
-    reasoning: true,
-    input: ["text"],
-    cost: { input: 1, output: 2, cacheRead: 0, cacheWrite: 0 },
-    contextWindow: 200000,
-    maxTokens: 8192,
-  } as Model<Api>;
-}
-
-describe("PiDirectAgentSession", () => {
-  test("treats SDK request abort rejections as turn cancellations", async () => {
-    const session = new PiDirectAgentSession(
-      createPiRuntime(createPiSession(() => Promise.reject(new Error("Request was aborted.")))),
-      { find: vi.fn(), getAll: vi.fn(() => []) },
-      {
-        provider: "pi",
-        cwd: "/tmp/paseo-pi-test",
-      },
-    );
-    const events: AgentStreamEvent[] = [];
-    session.subscribe((event) => events.push(event));
-
-    const { turnId } = await session.startTurn("hello");
-    await Promise.resolve();
-
-    expect(events).toEqual([
-      {
-        type: "turn_canceled",
-        provider: "pi",
-        turnId,
-        reason: "Request was aborted.",
-      },
-    ]);
-  });
-
-  test("compacts stale Copilot 413 sessions before prompting again", async () => {
-    const callOrder: string[] = [];
-    const sdkSession = createPiSession(
-      vi.fn(async () => {
-        callOrder.push("prompt");
-      }),
-      {
-        messages: [createPiAssistantErrorMessage("413 failed to parse request")],
-        errorMessage: "413 failed to parse request",
-        compact: vi.fn(async () => {
-          callOrder.push("compact");
-        }),
-      },
-    );
-    const session = new PiDirectAgentSession(
-      createPiRuntime(sdkSession),
-      { find: vi.fn(), getAll: vi.fn(() => []) },
-      {
-        provider: "pi",
-        cwd: "/tmp/paseo-pi-test",
-      },
-    );
-
-    await session.startTurn("continue");
-
-    expect(sdkSession.compact).toHaveBeenCalledTimes(1);
-    expect(sdkSession.prompt).toHaveBeenCalledTimes(1);
-    expect(callOrder).toEqual(["compact", "prompt"]);
-  });
-
-  test("does not compact other Pi errors before prompting", async () => {
-    const sdkSession = createPiSession(
-      vi.fn(async () => undefined),
-      {
-        messages: [createPiAssistantErrorMessage("413 unrelated provider error")],
-        compact: vi.fn(async () => {
-          throw new Error("should not compact");
-        }),
-      },
-    );
-    const session = new PiDirectAgentSession(
-      createPiRuntime(sdkSession),
-      { find: vi.fn(), getAll: vi.fn(() => []) },
-      {
-        provider: "pi",
-        cwd: "/tmp/paseo-pi-test",
-      },
-    );
-
-    await session.startTurn("continue");
-
-    expect(sdkSession.compact).not.toHaveBeenCalled();
-    expect(sdkSession.prompt).toHaveBeenCalledTimes(1);
-  });
-
-  test("setModel creates a minimal model for new ids under a known provider", async () => {
-    const sdkSession = createPiSession(async () => undefined);
-    const session = new PiDirectAgentSession(
-      createPiRuntime(sdkSession),
-      {
-        find: vi.fn(() => undefined),
-        getAll: vi.fn(() => [createPiModel("openrouter", "known-model")]),
-      },
-      {
-        provider: "pi",
-        cwd: "/tmp/paseo-pi-test",
-      },
-    );
-
-    await session.setModel("openrouter/blabal");
-
-    expect(sdkSession.setModel).toHaveBeenCalledWith({
-      id: "blabal",
-      name: "blabal",
-      api: "openai-completions",
-      provider: "openrouter",
-      baseUrl: "https://example.invalid/v1",
-      reasoning: false,
-      input: ["text"],
-      cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
-      contextWindow: 128000,
-      maxTokens: 16384,
-      compat: undefined,
-    });
-  });
-});
-
-describe("PiDirectAgentClient", () => {
-  test("lists only Pi models with configured auth", async () => {
-    const client = new PiDirectAgentClient({
-      logger: pino({ level: "silent" }),
-    });
-    const registry = {
-      find: vi.fn(),
-      getAll: vi.fn(() => [createPiModel("amazon-bedrock", "claude-sonnet-4")]),
-      getAvailable: vi.fn(() => [createPiModel("anthropic", "claude-opus-4-5")]),
-    };
-    (client as unknown as { modelRegistry: typeof registry }).modelRegistry = registry;
-
-    const models = await client.listModels({ cwd: "/tmp/paseo-pi-test", force: false });
-
-    expect(registry.getAvailable).toHaveBeenCalledTimes(1);
-    expect(registry.getAll).not.toHaveBeenCalled();
-    expect(models.map((model) => model.id)).toEqual(["anthropic/claude-opus-4-5"]);
-  });
-
-  test("loads project extensions before listing available models", async () => {
-    const testRoot = await mkdtemp(join(tmpdir(), "paseo-pi-extension-"));
-    const previousAgentDir = process.env.PI_CODING_AGENT_DIR;
-
-    try {
-      const agentDir = join(testRoot, "agent");
-      const cwd = join(testRoot, "project");
-      const extensionDir = join(cwd, ".pi", "extensions");
-      process.env.PI_CODING_AGENT_DIR = agentDir;
-
-      await mkdir(extensionDir, { recursive: true });
-      await writeFile(
-        join(extensionDir, "dummy-provider.ts"),
-        `
-export default function(pi) {
-  pi.registerProvider("paseo-dummy", {
-    baseUrl: "https://example.invalid/v1",
-    apiKey: "paseo-test-key",
-    api: "openai-responses",
-    models: [
-      {
-        id: "extension-model",
-        name: "Extension Model",
-        reasoning: true,
-        input: ["text"],
-        cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
-        contextWindow: 128000,
-        maxTokens: 4096
-      }
-    ]
-  });
-}
-`,
-        "utf-8",
-      );
-
-      const client = new PiDirectAgentClient({
-        logger: pino({ level: "silent" }),
-      });
-
-      const models = await client.listModels({ cwd, force: false });
-
-      expect(models.map((model) => model.id)).toContain("paseo-dummy/extension-model");
-    } finally {
-      if (previousAgentDir === undefined) {
-        delete process.env.PI_CODING_AGENT_DIR;
-      } else {
-        process.env.PI_CODING_AGENT_DIR = previousAgentDir;
-      }
-      await rm(testRoot, { recursive: true, force: true });
-    }
-  });
-
-  test("creates sessions with project extension models and exposes extension commands", async () => {
-    const testRoot = await mkdtemp(join(tmpdir(), "paseo-pi-extension-session-"));
-    const previousAgentDir = process.env.PI_CODING_AGENT_DIR;
-
-    try {
-      const agentDir = join(testRoot, "agent");
-      const cwd = join(testRoot, "project");
-      const extensionDir = join(cwd, ".pi", "extensions");
-      const shutdownMarker = join(testRoot, "shutdown.txt");
-      process.env.PI_CODING_AGENT_DIR = agentDir;
-
-      await mkdir(extensionDir, { recursive: true });
-      await writeFile(
-        join(extensionDir, "dummy-command.ts"),
-        `
-import { writeFileSync } from "node:fs";
-
-export default function(pi) {
-  pi.registerProvider("paseo-dummy", {
-    baseUrl: "https://example.invalid/v1",
-    apiKey: "paseo-test-key",
-    api: "openai-responses",
-    models: [
-      {
-        id: "extension-model",
-        name: "Extension Model",
-        reasoning: true,
-        input: ["text"],
-        cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
-        contextWindow: 128000,
-        maxTokens: 4096
-      }
-    ]
-  });
-
-  pi.registerCommand("dummy-command", {
-    description: "Dummy extension command",
-    handler: async () => {}
-  });
-
-  pi.on("session_shutdown", async () => {
-    writeFileSync(${JSON.stringify(shutdownMarker)}, "closed");
-  });
-}
-`,
-        "utf-8",
-      );
-
-      const client = new PiDirectAgentClient({
-        logger: pino({ level: "silent" }),
-      });
-      const session = await client.createSession({
-        provider: "pi",
-        cwd,
-        model: "paseo-dummy/extension-model",
-      });
-      let closed = false;
-
-      try {
-        await expect(session.listCommands()).resolves.toContainEqual({
-          name: "dummy-command",
-          description: "Dummy extension command",
-          argumentHint: "",
-        });
-        await session.close();
-        closed = true;
-        await expect(readFile(shutdownMarker, "utf-8")).resolves.toBe("closed");
-      } finally {
-        if (!closed) {
-          await session.close();
-        }
-      }
-    } finally {
-      if (previousAgentDir === undefined) {
-        delete process.env.PI_CODING_AGENT_DIR;
-      } else {
-        process.env.PI_CODING_AGENT_DIR = previousAgentDir;
-      }
-      await rm(testRoot, { recursive: true, force: true });
-    }
-  });
-});
diff --git a/packages/server/src/server/agent/providers/pi-direct-agent.ts b/packages/server/src/server/agent/providers/pi-direct-agent.ts
deleted file mode 100644
index edaee537d..000000000
--- a/packages/server/src/server/agent/providers/pi-direct-agent.ts
+++ /dev/null
@@ -1,1565 +0,0 @@
-import { randomUUID } from "node:crypto";
-import { existsSync } from "node:fs";
-import { join } from "node:path";
-import { homedir } from "node:os";
-import type { Logger } from "pino";
-import {
-  AuthStorage,
-  ModelRegistry,
-  SessionManager,
-  createAgentSessionFromServices,
-  createAgentSessionRuntime,
-  createAgentSessionServices,
-  getAgentDir,
-  type AgentSession as PiAgentSession,
-  type AgentSessionEvent,
-  type AgentSessionServices,
-  type BashToolInput,
-  type CreateAgentSessionRuntimeFactory,
-  type EditToolInput,
-  type FindToolInput,
-  type GrepToolInput,
-  type LsToolInput,
-  type ReadToolInput,
-  type ResourceLoader,
-  type ResolvedCommand,
-  type Skill,
-  type WriteToolInput,
-} from "@earendil-works/pi-coding-agent";
-import type { ThinkingLevel } from "@earendil-works/pi-agent-core";
-import type { Api, ImageContent, Model, TextContent } from "@earendil-works/pi-ai";
-import { z } from "zod";
-
-import {
-  getAgentStreamEventTurnId,
-  type AgentCapabilityFlags,
-  type AgentClient,
-  type AgentLaunchContext,
-  type AgentMetadata,
-  type AgentMode,
-  type AgentModelDefinition,
-  type AgentPermissionRequest,
-  type AgentPermissionResponse,
-  type AgentPersistenceHandle,
-  type AgentPromptInput,
-  type AgentRunOptions,
-  type AgentRunResult,
-  type AgentRuntimeInfo,
-  type AgentSession,
-  type AgentSessionConfig,
-  type AgentSlashCommand,
-  type AgentStreamEvent,
-  type AgentTimelineItem,
-  type AgentUsage,
-  type ListModesOptions,
-  type ListModelsOptions,
-  type ToolCallDetail,
-} from "../agent-sdk-types.js";
-import type { ProviderRuntimeSettings } from "../provider-launch-config.js";
-import { renderPromptAttachmentAsText } from "../prompt-attachments.js";
-import { findExecutable, isCommandAvailable } from "../../../utils/executable.js";
-import {
-  formatDiagnosticStatus,
-  formatProviderDiagnostic,
-  formatProviderDiagnosticError,
-  resolveBinaryVersion,
-  toDiagnosticErrorMessage,
-} from "./diagnostic-utils.js";
-import { applyPiSessionRecoveryPolicy } from "./pi-session-recovery-policy.js";
-
-const PI_PROVIDER = "pi";
-const DEFAULT_PI_THINKING_LEVEL: ThinkingLevel = "medium";
-const PI_BINARY_COMMAND = process.env.PI_COMMAND ?? process.env.PI_ACP_PI_COMMAND ?? "pi";
-
-const PI_CAPABILITIES: AgentCapabilityFlags = {
-  supportsStreaming: true,
-  supportsSessionPersistence: true,
-  supportsDynamicModes: true,
-  supportsMcpServers: false,
-  supportsReasoningStream: true,
-  supportsToolInvocations: true,
-};
-
-interface PiDirectAgentClientOptions {
-  logger: Logger;
-  runtimeSettings?: ProviderRuntimeSettings;
-}
-
-interface PiPromptPayload {
-  text: string;
-  images?: ImageContent[];
-}
-
-interface ToolCallOutputSummary {
-  output?: string;
-  exitCode?: number | null;
-}
-
-interface PiModelReference {
-  provider?: string;
-  id: string;
-}
-
-interface PiPersistenceMetadata {
-  cwd?: string;
-}
-
-interface StartTurnResult {
-  turnId: string;
-}
-
-interface PiDirectSessionResult {
-  runtime: PiDirectSessionRuntimeAdapter;
-  modelRegistry: ModelRegistry;
-}
-
-export type PiDirectSessionAdapter = Pick<
-  PiAgentSession,
-  | "abort"
-  | "agent"
-  | "compact"
-  | "dispose"
-  | "extensionRunner"
-  | "getSessionStats"
-  | "messages"
-  | "model"
-  | "prompt"
-  | "promptTemplates"
-  | "resourceLoader"
-  | "sessionId"
-  | "sessionManager"
-  | "setModel"
-  | "setThinkingLevel"
-  | "subscribe"
-  | "thinkingLevel"
->;
-
-export interface PiDirectSessionRuntimeAdapter {
-  readonly session: PiDirectSessionAdapter;
-  dispose(): Promise<void>;
-}
-
-type PiDirectModelRegistry = Pick<ModelRegistry, "find" | "getAll">;
-
-interface PiToolResultObject {
-  output?: string;
-  stdout?: string;
-  text?: string;
-  content?: PiToolResultContent[];
-  exitCode?: number;
-  code?: number;
-  details?: PiToolResultDetails;
-}
-
-interface PiToolResultDetails {
-  diff?: string;
-}
-
-interface PiToolResultTextContent {
-  type: "text";
-  text: string;
-}
-
-interface PiToolResultUnknownContent {
-  type: string;
-}
-
-type PiToolResultContent = PiToolResultTextContent | PiToolResultUnknownContent;
-type PiToolResult = string | PiToolResultObject | null;
-
-interface PiBashToolCall {
-  kind: "bash";
-  toolName: "bash";
-  args: BashToolInput;
-}
-
-interface PiReadToolCall {
-  kind: "read";
-  toolName: "read";
-  args: ReadToolInput;
-}
-
-interface PiEditToolCall {
-  kind: "edit";
-  toolName: "edit";
-  args: EditToolInput;
-}
-
-interface PiWriteToolCall {
-  kind: "write";
-  toolName: "write";
-  args: WriteToolInput;
-}
-
-interface PiFindToolCall {
-  kind: "find";
-  toolName: "find";
-  args: FindToolInput;
-}
-
-interface PiGrepToolCall {
-  kind: "grep";
-  toolName: "grep";
-  args: GrepToolInput;
-}
-
-interface PiLsToolCall {
-  kind: "ls";
-  toolName: "ls";
-  args: LsToolInput;
-}
-
-interface PiUnknownToolCall {
-  kind: "unknown";
-  toolName: string;
-  args: unknown;
-}
-
-type PiTrackedToolCall =
-  | PiBashToolCall
-  | PiReadToolCall
-  | PiEditToolCall
-  | PiWriteToolCall
-  | PiFindToolCall
-  | PiGrepToolCall
-  | PiLsToolCall
-  | PiUnknownToolCall;
-
-const PI_THINKING_OPTIONS: ReadonlyArray<{
-  id: ThinkingLevel;
-  label: string;
-  description: string;
-  isDefault?: boolean;
-}> = [
-  { id: "off", label: "Off", description: "No extra reasoning" },
-  { id: "minimal", label: "Minimal", description: "Light reasoning" },
-  { id: "low", label: "Low", description: "Faster reasoning" },
-  { id: "medium", label: "Medium", description: "Balanced reasoning", isDefault: true },
-  { id: "high", label: "High", description: "Deeper reasoning" },
-  { id: "xhigh", label: "XHigh", description: "Maximum reasoning" },
-] as const;
-
-const PiPromptTextBlockSchema = z.object({
-  type: z.literal("text"),
-  text: z.string(),
-});
-
-const PiToolResultTextContentSchema = z.object({
-  type: z.literal("text"),
-  text: z.string(),
-});
-
-const PiToolResultUnknownContentSchema = z
-  .object({
-    type: z.string(),
-  })
-  .passthrough();
-
-const PiToolResultContentSchema = z.union([
-  PiToolResultTextContentSchema,
-  PiToolResultUnknownContentSchema,
-]);
-
-const PiToolResultDetailsSchema = z
-  .object({
-    diff: z.string().optional(),
-  })
-  .passthrough();
-
-const PiToolResultObjectSchema = z
-  .object({
-    output: z.string().optional(),
-    stdout: z.string().optional(),
-    text: z.string().optional(),
-    content: z.array(PiToolResultContentSchema).optional(),
-    exitCode: z.number().optional(),
-    code: z.number().optional(),
-    details: PiToolResultDetailsSchema.optional(),
-  })
-  .passthrough();
-
-const PiToolResultSchema = z.union([z.string(), PiToolResultObjectSchema, z.null()]);
-
-const PiPersistenceMetadataSchema = z
-  .object({
-    cwd: z.string().optional(),
-  })
-  .passthrough();
-
-const BashToolInputSchema: z.ZodType<BashToolInput> = z.object({
-  command: z.string(),
-  timeout: z.number().optional(),
-});
-
-const ReadToolInputSchema: z.ZodType<ReadToolInput> = z.object({
-  path: z.string(),
-  offset: z.number().optional(),
-  limit: z.number().optional(),
-});
-
-const EditToolInputSchema: z.ZodType<EditToolInput> = z.object({
-  path: z.string(),
-  edits: z.array(
-    z.object({
-      oldText: z.string(),
-      newText: z.string(),
-    }),
-  ),
-});
-
-const LegacyEditToolInputSchema = z.object({
-  path: z.string(),
-  old_string: z.string().optional(),
-  oldString: z.string().optional(),
-  new_string: z.string().optional(),
-  newString: z.string().optional(),
-});
-
-const WriteToolInputSchema: z.ZodType<WriteToolInput> = z.object({
-  path: z.string(),
-  content: z.string(),
-});
-
-const FindToolInputSchema: z.ZodType<FindToolInput> = z.object({
-  pattern: z.string(),
-  path: z.string().optional(),
-  limit: z.number().optional(),
-});
-
-const GrepToolInputSchema: z.ZodType<GrepToolInput> = z.object({
-  pattern: z.string(),
-  path: z.string().optional(),
-  glob: z.string().optional(),
-  ignoreCase: z.boolean().optional(),
-  literal: z.boolean().optional(),
-  context: z.number().optional(),
-  limit: z.number().optional(),
-});
-
-const LsToolInputSchema: z.ZodType<LsToolInput> = z.object({
-  path: z.string().optional(),
-  limit: z.number().optional(),
-});
-
-function normalizePiModelLabel(label: string): string {
-  return label.trim().replace(/[_\s]+/g, " ");
-}
-
-export function transformPiModels(models: AgentModelDefinition[]): AgentModelDefinition[] {
-  return models.map((model) => {
-    if (!model.label.includes("/")) {
-      return model;
-    }
-
-    const segments = model.label.split("/").filter((segment) => segment.length > 0);
-    const rawLabel = segments.at(-1);
-    if (!rawLabel) {
-      return model;
-    }
-
-    return {
-      ...model,
-      label: normalizePiModelLabel(rawLabel),
-      description: model.description ?? model.label,
-    };
-  });
-}
-
-function isPiThinkingLevel(value: string | null | undefined): value is ThinkingLevel {
-  return (
-    value === "off" ||
-    value === "minimal" ||
-    value === "low" ||
-    value === "medium" ||
-    value === "high" ||
-    value === "xhigh"
-  );
-}
-
-function normalizePiThinkingOption(value: string | null | undefined): ThinkingLevel | null {
-  if (!value) {
-    return null;
-  }
-  return isPiThinkingLevel(value) ? value : null;
-}
-
-function toAgentUsage(
-  stats: ReturnType<PiAgentSession["getSessionStats"]>,
-): AgentUsage | undefined {
-  const inputTokens = stats.tokens.input;
-  const cachedInputTokens = stats.tokens.cacheRead;
-  const outputTokens = stats.tokens.output;
-  const totalCostUsd = stats.cost;
-
-  if (inputTokens === 0 && cachedInputTokens === 0 && outputTokens === 0 && totalCostUsd === 0) {
-    return undefined;
-  }
-
-  return {
-    inputTokens,
-    cachedInputTokens,
-    outputTokens,
-    totalCostUsd,
-  };
-}
-
-function convertPromptInput(prompt: AgentPromptInput): PiPromptPayload {
-  if (typeof prompt === "string") {
-    return { text: prompt };
-  }
-
-  const textParts: string[] = [];
-  const images: ImageContent[] = [];
-
-  for (const block of prompt) {
-    if (block.type === "text") {
-      textParts.push(block.text);
-      continue;
-    }
-
-    if (block.type === "image") {
-      images.push({
-        type: "image",
-        data: block.data,
-        mimeType: block.mimeType,
-      });
-      continue;
-    }
-
-    textParts.push(renderPromptAttachmentAsText(block));
-  }
-
-  const payload: PiPromptPayload = {
-    text: textParts.join("\n\n"),
-  };
-  if (images.length > 0) {
-    payload.images = images;
-  }
-  return payload;
-}
-
-function parseToolResult(rawResult: unknown): PiToolResult {
-  const parsed = PiToolResultSchema.safeParse(rawResult);
-  if (parsed.success) {
-    return parsed.data;
-  }
-  return null;
-}
-
-function extractTextFromToolResult(result: PiToolResult): string | undefined {
-  if (typeof result === "string") {
-    return result;
-  }
-  if (!result) {
-    return undefined;
-  }
-
-  const directText = result.output ?? result.stdout ?? result.text;
-  if (directText) {
-    return directText;
-  }
-  if (!result.content) {
-    return undefined;
-  }
-
-  const textParts: string[] = [];
-  for (const block of result.content) {
-    if (block.type === "text" && "text" in block) {
-      textParts.push(block.text);
-    }
-  }
-
-  if (textParts.length === 0) {
-    return undefined;
-  }
-  return textParts.join("\n");
-}
-
-function resolveToolCallOutput(result: PiToolResult): ToolCallOutputSummary {
-  if (typeof result === "string") {
-    return { output: result };
-  }
-  if (!result) {
-    return {};
-  }
-
-  const summary: ToolCallOutputSummary = {
-    output: extractTextFromToolResult(result),
-  };
-  if (typeof result.exitCode === "number") {
-    summary.exitCode = result.exitCode;
-    return summary;
-  }
-  if (typeof result.code === "number") {
-    summary.exitCode = result.code;
-    return summary;
-  }
-  summary.exitCode = null;
-  return summary;
-}
-
-function normalizeLegacyEditArgs(rawArgs: unknown): EditToolInput | null {
-  const parsed = LegacyEditToolInputSchema.safeParse(rawArgs);
-  if (!parsed.success) {
-    return null;
-  }
-
-  const oldText = parsed.data.old_string ?? parsed.data.oldString;
-  const newText = parsed.data.new_string ?? parsed.data.newString;
-  if (!oldText || newText === undefined) {
-    return null;
-  }
-
-  return {
-    path: parsed.data.path,
-    edits: [{ oldText, newText }],
-  };
-}
-
-function parseEditToolArgs(rawArgs: unknown): PiTrackedToolCall {
-  const parsed = EditToolInputSchema.safeParse(rawArgs);
-  if (parsed.success) {
-    return { kind: "edit", toolName: "edit", args: parsed.data };
-  }
-  const legacyArgs = normalizeLegacyEditArgs(rawArgs);
-  if (legacyArgs) {
-    return { kind: "edit", toolName: "edit", args: legacyArgs };
-  }
-  return { kind: "unknown", toolName: "edit", args: rawArgs ?? null };
-}
-
-type SimpleToolKind = "bash" | "read" | "write" | "find" | "grep" | "ls";
-const SIMPLE_TOOL_SCHEMAS: {
-  [K in SimpleToolKind]: { safeParse: (data: unknown) => { success: boolean; data?: unknown } };
-} = {
-  bash: BashToolInputSchema,
-  read: ReadToolInputSchema,
-  write: WriteToolInputSchema,
-  find: FindToolInputSchema,
-  grep: GrepToolInputSchema,
-  ls: LsToolInputSchema,
-};
-
-function parseToolArgs(toolName: string, rawArgs: unknown): PiTrackedToolCall {
-  if (toolName === "edit") {
-    return parseEditToolArgs(rawArgs);
-  }
-  const schema = SIMPLE_TOOL_SCHEMAS[toolName as SimpleToolKind];
-  if (schema) {
-    const parsed = schema.safeParse(rawArgs);
-    if (parsed.success) {
-      return { kind: toolName as SimpleToolKind, toolName, args: parsed.data } as PiTrackedToolCall;
-    }
-  }
-  return { kind: "unknown", toolName, args: rawArgs ?? null };
-}
-
-function mapFindToolDetail(args: FindToolInput, result: PiToolResult): ToolCallDetail {
-  return {
-    type: "search",
-    query: args.pattern,
-    toolName: "search",
-    content: typeof result === "string" ? result : undefined,
-  };
-}
-
-function mapGrepToolDetail(args: GrepToolInput, result: PiToolResult): ToolCallDetail {
-  return {
-    type: "search",
-    query: args.pattern,
-    toolName: "grep",
-    content: typeof result === "string" ? result : undefined,
-  };
-}
-
-function mapLsToolDetail(args: LsToolInput, result: PiToolResult): ToolCallDetail {
-  const query = args.path ?? "ls";
-  return {
-    type: "search",
-    query,
-    content: typeof result === "string" ? result : undefined,
-  };
-}
-
-function mapToolDetail(toolCall: PiTrackedToolCall, result?: PiToolResult): ToolCallDetail {
-  const parsedResult = result ?? null;
-
-  switch (toolCall.kind) {
-    case "bash": {
-      const summary = resolveToolCallOutput(parsedResult);
-      return {
-        type: "shell",
-        command: toolCall.args.command,
-        output: summary.output,
-        exitCode: summary.exitCode,
-      };
-    }
-    case "read":
-      return {
-        type: "read",
-        filePath: toolCall.args.path,
-        content: extractTextFromToolResult(parsedResult),
-        offset: toolCall.args.offset,
-        limit: toolCall.args.limit,
-      };
-    case "edit": {
-      const firstEdit = toolCall.args.edits[0];
-      const unifiedDiff =
-        parsedResult && typeof parsedResult !== "string" ? parsedResult.details?.diff : undefined;
-
-      return {
-        type: "edit",
-        filePath: toolCall.args.path,
-        oldString: firstEdit?.oldText,
-        newString: firstEdit?.newText,
-        unifiedDiff,
-      };
-    }
-    case "write":
-      return {
-        type: "write",
-        filePath: toolCall.args.path,
-        content: toolCall.args.content,
-      };
-    case "find":
-      return mapFindToolDetail(toolCall.args, parsedResult);
-    case "grep":
-      return mapGrepToolDetail(toolCall.args, parsedResult);
-    case "ls":
-      return mapLsToolDetail(toolCall.args, parsedResult);
-    default:
-      return {
-        type: "unknown",
-        input: toolCall.args,
-        output: parsedResult,
-      };
-  }
-}
-
-function parseModelReference(modelId: string | null): PiModelReference | null {
-  if (!modelId) {
-    return null;
-  }
-  if (modelId.includes("/")) {
-    const [provider, ...rest] = modelId.split("/");
-    const id = rest.join("/");
-    if (provider && id) {
-      return { provider, id };
-    }
-  }
-  if (modelId.includes(":")) {
-    const [provider, ...rest] = modelId.split(":");
-    const id = rest.join(":");
-    if (provider && id) {
-      return { provider, id };
-    }
-  }
-  return { id: modelId };
-}
-
-function mapResolvedCommand(command: ResolvedCommand): AgentSlashCommand {
-  return {
-    name: command.invocationName,
-    description: command.description ?? "Extension command",
-    argumentHint: "",
-  };
-}
-
-function mapSkillCommand(skill: Skill): AgentSlashCommand {
-  return {
-    name: `skill:${skill.name}`,
-    description: skill.description || "Skill",
-    argumentHint: "",
-  };
-}
-
-function buildSlashCommands(session: PiDirectSessionAdapter): AgentSlashCommand[] {
-  const commands: AgentSlashCommand[] = [];
-  const extensionCommands = session.extensionRunner?.getRegisteredCommands() ?? [];
-
-  for (const command of extensionCommands) {
-    commands.push(mapResolvedCommand(command));
-  }
-
-  for (const template of session.promptTemplates) {
-    commands.push({
-      name: template.name,
-      description: template.description ?? "Prompt template",
-      argumentHint: "",
-    });
-  }
-
-  const resourceLoader: ResourceLoader = session.resourceLoader;
-  const skills = resourceLoader.getSkills().skills;
-  for (const skill of skills) {
-    commands.push(mapSkillCommand(skill));
-  }
-
-  return commands;
-}
-
-function applySystemPrompt(session: PiAgentSession, systemPrompt: string | undefined): void {
-  const trimmed = systemPrompt?.trim();
-  if (!trimmed) {
-    return;
-  }
-
-  // Pi does not expose a public setter for composing an additional system prompt,
-  // so this escape hatch is isolated to one typed boundary.
-  const sessionObject = session as object;
-  const baseSystemPrompt = Reflect.get(sessionObject, "_baseSystemPrompt");
-  const currentBase =
-    typeof baseSystemPrompt === "string" ? baseSystemPrompt : session.agent.state.systemPrompt;
-  const combinedPrompt = currentBase ? `${currentBase}\n\n${trimmed}` : trimmed;
-  Reflect.set(sessionObject, "_baseSystemPrompt", combinedPrompt);
-  session.agent.state.systemPrompt = combinedPrompt;
-}
-
-function isTextContentBlock(block: unknown): block is TextContent {
-  return PiPromptTextBlockSchema.safeParse(block).success;
-}
-
-function getUserMessageText(content: string | (TextContent | ImageContent)[]): string {
-  if (typeof content === "string") {
-    return content;
-  }
-
-  const textParts: string[] = [];
-  for (const block of content) {
-    if (isTextContentBlock(block)) {
-      textParts.push(block.text);
-    }
-  }
-  return textParts.join("\n\n");
-}
-
-function parsePersistenceMetadata(metadata: AgentMetadata | undefined): PiPersistenceMetadata {
-  const parsed = PiPersistenceMetadataSchema.safeParse(metadata);
-  if (parsed.success) {
-    return parsed.data;
-  }
-  return {};
-}
-
-function isPiRequestAbortError(error: unknown): boolean {
-  if (error instanceof Error && error.name === "AbortError") {
-    return true;
-  }
-
-  return /\brequest was aborted\b/i.test(toDiagnosticErrorMessage(error));
-}
-
-function resolveThinkingOptionId(
-  cachedThinkingOptionId: string | null,
-  sessionThinkingLevel: ThinkingLevel,
-): ThinkingLevel | null {
-  const currentThinking = cachedThinkingOptionId ?? sessionThinkingLevel;
-  return normalizePiThinkingOption(currentThinking);
-}
-
-function mapThinkingOption(option: (typeof PI_THINKING_OPTIONS)[number]) {
-  const mappedOption = {
-    id: option.id,
-    label: option.label,
-    description: option.description,
-  };
-  if (option.isDefault) {
-    return {
-      ...mappedOption,
-      isDefault: true,
-    };
-  }
-  return mappedOption;
-}
-
-function findModelInRegistry(
-  registry: PiDirectModelRegistry,
-  parsedReference: PiModelReference,
-): Model<Api> | undefined {
-  if (parsedReference.provider) {
-    return (
-      registry.find(parsedReference.provider, parsedReference.id) ??
-      createProviderModelFallback(registry, {
-        provider: parsedReference.provider,
-        id: parsedReference.id,
-      })
-    );
-  }
-
-  return registry.getAll().find((entry) => {
-    if (entry.id === parsedReference.id) {
-      return true;
-    }
-    return `${entry.provider}/${entry.id}` === parsedReference.id;
-  });
-}
-
-function createProviderModelFallback(
-  registry: PiDirectModelRegistry,
-  parsedReference: { provider: string; id: string },
-): Model<Api> | undefined {
-  const providerDefault = registry
-    .getAll()
-    .find((model) => model.provider === parsedReference.provider);
-  if (!providerDefault) {
-    return undefined;
-  }
-
-  return {
-    id: parsedReference.id,
-    name: parsedReference.id,
-    api: providerDefault.api,
-    provider: parsedReference.provider,
-    baseUrl: providerDefault.baseUrl,
-    reasoning: false,
-    input: ["text"],
-    cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
-    contextWindow: 128000,
-    maxTokens: 16384,
-    compat: providerDefault.compat,
-  };
-}
-
-export class PiDirectAgentSession implements AgentSession {
-  readonly provider = PI_PROVIDER;
-  readonly capabilities = PI_CAPABILITIES;
-
-  private readonly subscribers = new Set<(event: AgentStreamEvent) => void>();
-  private readonly activeToolCalls = new Map<string, PiTrackedToolCall>();
-  private activeTurnId: string | null = null;
-  private lastKnownThinkingOptionId: string | null;
-  private latestUsage: AgentUsage | undefined;
-
-  constructor(
-    private readonly runtime: PiDirectSessionRuntimeAdapter,
-    private readonly modelRegistry: PiDirectModelRegistry,
-    private readonly config: AgentSessionConfig,
-  ) {
-    const session = this.session;
-    this.lastKnownThinkingOptionId =
-      normalizePiThinkingOption(config.thinkingOptionId) ?? session.thinkingLevel ?? null;
-
-    session.subscribe((event) => {
-      this.handleSessionEvent(event);
-    });
-  }
-
-  private get session(): PiDirectSessionAdapter {
-    return this.runtime.session;
-  }
-
-  get id(): string | null {
-    return this.session.sessionId;
-  }
-
-  private emit(event: AgentStreamEvent): void {
-    for (const subscriber of this.subscribers) {
-      subscriber(event);
-    }
-  }
-
-  private currentTurnIdForEvent(): string | undefined {
-    return this.activeTurnId ?? undefined;
-  }
-
-  private emitToolCallEvent(
-    toolCallId: string,
-    toolCall: PiTrackedToolCall,
-    status: "running" | "completed" | "failed",
-    result: PiToolResult,
-    error: unknown,
-  ): void {
-    const turnId = this.currentTurnIdForEvent();
-    const detail = mapToolDetail(toolCall, result);
-    const baseItem = {
-      type: "tool_call" as const,
-      callId: toolCallId,
-      name: toolCall.toolName,
-      detail,
-    };
-    const item =
-      status === "failed" ? { ...baseItem, status, error } : { ...baseItem, status, error: null };
-    this.emit({
-      type: "timeline",
-      provider: PI_PROVIDER,
-      turnId,
-      item,
-    });
-  }
-
-  private handleMessageUpdate(
-    event: Extract<AgentSessionEvent, { type: "message_update" }>,
-    turnId: string | undefined,
-  ): void {
-    if (event.message.role !== "assistant") {
-      return;
-    }
-    if (event.assistantMessageEvent.type === "text_delta") {
-      this.emit({
-        type: "timeline",
-        provider: PI_PROVIDER,
-        turnId,
-        item: {
-          type: "assistant_message",
-          text: event.assistantMessageEvent.delta ?? "",
-        },
-      });
-      return;
-    }
-    if (event.assistantMessageEvent.type === "thinking_delta") {
-      this.emit({
-        type: "timeline",
-        provider: PI_PROVIDER,
-        turnId,
-        item: {
-          type: "reasoning",
-          text: event.assistantMessageEvent.delta ?? "",
-        },
-      });
-    }
-  }
-
-  private handleSessionEvent(event: AgentSessionEvent): void {
-    const turnId = this.currentTurnIdForEvent();
-
-    switch (event.type) {
-      case "agent_start":
-        this.emit({
-          type: "thread_started",
-          provider: PI_PROVIDER,
-          sessionId: this.session.sessionId,
-        });
-        return;
-      case "turn_start":
-        this.emit({
-          type: "turn_started",
-          provider: PI_PROVIDER,
-          turnId,
-        });
-        return;
-      case "message_update":
-        this.handleMessageUpdate(event, turnId);
-        return;
-      case "tool_execution_start": {
-        const toolCall = parseToolArgs(event.toolName, event.args);
-        this.activeToolCalls.set(event.toolCallId, toolCall);
-        this.emitToolCallEvent(event.toolCallId, toolCall, "running", null, null);
-        return;
-      }
-      case "tool_execution_update": {
-        const toolCall = this.activeToolCalls.get(event.toolCallId);
-        if (!toolCall) {
-          return;
-        }
-
-        const partialResult = parseToolResult(event.partialResult);
-        this.emitToolCallEvent(event.toolCallId, toolCall, "running", partialResult, null);
-        return;
-      }
-      case "tool_execution_end": {
-        const toolCall =
-          this.activeToolCalls.get(event.toolCallId) ?? parseToolArgs(event.toolName, null);
-        this.activeToolCalls.delete(event.toolCallId);
-
-        const result = parseToolResult(event.result);
-        const error = event.isError ? event.result : null;
-        const status = event.isError ? "failed" : "completed";
-        this.emitToolCallEvent(event.toolCallId, toolCall, status, result, error);
-        return;
-      }
-      case "turn_end":
-        return;
-      case "compaction_start":
-        this.emit({
-          type: "timeline",
-          provider: PI_PROVIDER,
-          turnId,
-          item: {
-            type: "compaction",
-            status: "loading",
-            trigger: event.reason === "manual" ? "manual" : "auto",
-          },
-        });
-        return;
-      case "compaction_end":
-        this.emit({
-          type: "timeline",
-          provider: PI_PROVIDER,
-          turnId,
-          item: {
-            type: "compaction",
-            status: "completed",
-          },
-        });
-        return;
-      case "agent_end": {
-        this.latestUsage = toAgentUsage(this.session.getSessionStats());
-        const currentTurnId = turnId;
-        this.activeTurnId = null;
-        if (this.session.agent.state.errorMessage) {
-          this.emit({
-            type: "turn_failed",
-            provider: PI_PROVIDER,
-            turnId: currentTurnId,
-            error: this.session.agent.state.errorMessage,
-          });
-          return;
-        }
-        this.emit({
-          type: "turn_completed",
-          provider: PI_PROVIDER,
-          turnId: currentTurnId,
-          usage: this.latestUsage,
-        });
-        return;
-      }
-      default:
-        return;
-    }
-  }
-
-  async run(prompt: AgentPromptInput, options?: AgentRunOptions): Promise<AgentRunResult> {
-    const timeline: AgentTimelineItem[] = [];
-    let finalText = "";
-    let usage: AgentUsage | undefined;
-    let turnId: string | null = null;
-    const bufferedEvents: AgentStreamEvent[] = [];
-    let settled = false;
-    let resolveCompletion!: () => void;
-    let rejectCompletion!: (error: Error) => void;
-
-    function processEvent(event: AgentStreamEvent): void {
-      if (settled) {
-        return;
-      }
-
-      const eventTurnId = getAgentStreamEventTurnId(event);
-      if (turnId && eventTurnId && eventTurnId !== turnId) {
-        return;
-      }
-      if (event.type === "timeline") {
-        timeline.push(event.item);
-        if (event.item.type === "assistant_message") {
-          finalText += event.item.text;
-        }
-        return;
-      }
-      if (event.type === "turn_completed") {
-        usage = event.usage;
-        settled = true;
-        resolveCompletion();
-        return;
-      }
-      if (event.type === "turn_failed") {
-        settled = true;
-        rejectCompletion(new Error(event.error));
-      }
-    }
-
-    const completion = new Promise<void>((resolve, reject) => {
-      resolveCompletion = resolve;
-      rejectCompletion = reject;
-    });
-    const unsubscribe = this.subscribe((event) => {
-      if (!turnId) {
-        bufferedEvents.push(event);
-        return;
-      }
-      processEvent(event);
-    });
-
-    try {
-      const result = await this.startTurn(prompt, options);
-      turnId = result.turnId;
-      for (const event of bufferedEvents) {
-        processEvent(event);
-      }
-      if (!settled) {
-        await completion;
-      }
-    } finally {
-      unsubscribe();
-    }
-
-    return {
-      sessionId: this.session.sessionId,
-      finalText,
-      usage,
-      timeline,
-    };
-  }
-
-  async startTurn(prompt: AgentPromptInput, _options?: AgentRunOptions): Promise<StartTurnResult> {
-    if (this.activeTurnId) {
-      throw new Error("A Pi turn is already active");
-    }
-
-    const payload = convertPromptInput(prompt);
-    const turnId = randomUUID();
-    this.activeTurnId = turnId;
-
-    try {
-      await applyPiSessionRecoveryPolicy(this.session);
-    } catch (error) {
-      this.activeTurnId = null;
-      this.emit({
-        type: "turn_failed",
-        provider: PI_PROVIDER,
-        turnId,
-        error: toDiagnosticErrorMessage(error),
-      });
-      return { turnId };
-    }
-
-    void this.session
-      .prompt(payload.text, payload.images ? { images: payload.images } : undefined)
-      .catch((error) => {
-        const failedTurnId = this.activeTurnId ?? turnId;
-        this.activeTurnId = null;
-        if (isPiRequestAbortError(error)) {
-          this.emit({
-            type: "turn_canceled",
-            provider: PI_PROVIDER,
-            turnId: failedTurnId,
-            reason: toDiagnosticErrorMessage(error),
-          });
-          return;
-        }
-        this.emit({
-          type: "turn_failed",
-          provider: PI_PROVIDER,
-          turnId: failedTurnId,
-          error: toDiagnosticErrorMessage(error),
-        });
-      });
-
-    return { turnId };
-  }
-
-  subscribe(callback: (event: AgentStreamEvent) => void): () => void {
-    this.subscribers.add(callback);
-    return () => {
-      this.subscribers.delete(callback);
-    };
-  }
-
-  async *streamHistory(): AsyncGenerator<AgentStreamEvent> {
-    const pendingToolCalls = new Map<string, PiTrackedToolCall>();
-    let userIndex = 0;
-
-    for (const message of this.session.messages) {
-      if (message.role === "user") {
-        const text = getUserMessageText(message.content);
-        if (text) {
-          yield {
-            type: "timeline",
-            provider: PI_PROVIDER,
-            item: {
-              type: "user_message",
-              text,
-              messageId: `pi-user-${userIndex}`,
-            },
-          };
-        }
-        userIndex += 1;
-        continue;
-      }
-
-      if (message.role === "assistant") {
-        for (const content of message.content) {
-          if (content.type === "text" && content.text) {
-            yield {
-              type: "timeline",
-              provider: PI_PROVIDER,
-              item: { type: "assistant_message", text: content.text },
-            };
-            continue;
-          }
-
-          if (content.type === "thinking" && content.thinking) {
-            yield {
-              type: "timeline",
-              provider: PI_PROVIDER,
-              item: { type: "reasoning", text: content.thinking },
-            };
-            continue;
-          }
-
-          if (content.type === "toolCall") {
-            const tracked = parseToolArgs(content.name, content.arguments);
-            pendingToolCalls.set(content.id, tracked);
-            yield {
-              type: "timeline",
-              provider: PI_PROVIDER,
-              item: {
-                type: "tool_call",
-                callId: content.id,
-                name: tracked.toolName,
-                status: "running",
-                detail: mapToolDetail(tracked, null),
-                error: null,
-              },
-            };
-          }
-        }
-        continue;
-      }
-
-      if (message.role === "toolResult") {
-        const tracked =
-          pendingToolCalls.get(message.toolCallId) ?? parseToolArgs(message.toolName, null);
-        pendingToolCalls.delete(message.toolCallId);
-        const result = parseToolResult({ content: message.content });
-        const detail = mapToolDetail(tracked, result);
-
-        if (message.isError) {
-          const errorText = extractTextFromToolResult(result) ?? "Tool call failed";
-          yield {
-            type: "timeline",
-            provider: PI_PROVIDER,
-            item: {
-              type: "tool_call",
-              callId: message.toolCallId,
-              name: tracked.toolName,
-              status: "failed",
-              detail,
-              error: errorText,
-            },
-          };
-        } else {
-          yield {
-            type: "timeline",
-            provider: PI_PROVIDER,
-            item: {
-              type: "tool_call",
-              callId: message.toolCallId,
-              name: tracked.toolName,
-              status: "completed",
-              detail,
-              error: null,
-            },
-          };
-        }
-        continue;
-      }
-
-      if (message.role === "bashExecution") {
-        const callId = `pi-bash-${message.timestamp}`;
-        const exitCode = message.exitCode ?? null;
-        const detail: ToolCallDetail = {
-          type: "shell",
-          command: message.command,
-          output: message.output,
-          exitCode,
-        };
-        yield {
-          type: "timeline",
-          provider: PI_PROVIDER,
-          item: {
-            type: "tool_call",
-            callId,
-            name: "bash",
-            status: message.cancelled ? "canceled" : "completed",
-            detail,
-            error: null,
-          },
-        };
-      }
-    }
-  }
-
-  async getRuntimeInfo(): Promise<AgentRuntimeInfo> {
-    const thinkingOptionId = resolveThinkingOptionId(
-      this.lastKnownThinkingOptionId,
-      this.session.thinkingLevel,
-    );
-
-    return {
-      provider: PI_PROVIDER,
-      sessionId: this.session.sessionId,
-      model: this.session.model ? `${this.session.model.provider}/${this.session.model.id}` : null,
-      thinkingOptionId,
-      modeId: null,
-    };
-  }
-
-  async getAvailableModes(): Promise<AgentMode[]> {
-    return [];
-  }
-
-  async getCurrentMode(): Promise<string | null> {
-    return null;
-  }
-
-  async setMode(modeId: string): Promise<void> {
-    void modeId;
-    throw new Error("Pi does not expose selectable modes");
-  }
-
-  getPendingPermissions(): AgentPermissionRequest[] {
-    return [];
-  }
-
-  async respondToPermission(requestId: string, response: AgentPermissionResponse): Promise<void> {
-    void requestId;
-    void response;
-  }
-
-  describePersistence(): AgentPersistenceHandle | null {
-    return {
-      provider: PI_PROVIDER,
-      sessionId: this.session.sessionId,
-      nativeHandle: this.session.sessionManager.getSessionFile(),
-      metadata: {
-        cwd: this.session.sessionManager.getCwd(),
-      },
-    };
-  }
-
-  async interrupt(): Promise<void> {
-    await this.session.abort();
-  }
-
-  async close(): Promise<void> {
-    await this.runtime.dispose();
-  }
-
-  async listCommands(): Promise<AgentSlashCommand[]> {
-    return buildSlashCommands(this.session);
-  }
-
-  async setModel(modelId: string | null): Promise<void> {
-    const parsedReference = parseModelReference(modelId);
-    if (!parsedReference) {
-      return;
-    }
-
-    const model = findModelInRegistry(this.modelRegistry, parsedReference);
-    if (!model) {
-      throw new Error(`Unknown Pi model: ${modelId}`);
-    }
-
-    await this.session.setModel(model);
-    this.config.model = `${model.provider}/${model.id}`;
-  }
-
-  async setThinkingOption(thinkingOptionId: string | null): Promise<void> {
-    const thinkingLevel = normalizePiThinkingOption(thinkingOptionId) ?? DEFAULT_PI_THINKING_LEVEL;
-    this.session.setThinkingLevel(thinkingLevel);
-    this.lastKnownThinkingOptionId = thinkingLevel;
-    this.config.thinkingOptionId = thinkingLevel;
-  }
-}
-
-export class PiDirectAgentClient implements AgentClient {
-  readonly provider = PI_PROVIDER;
-  readonly capabilities = PI_CAPABILITIES;
-
-  private readonly logger: Logger;
-  private readonly runtimeSettings?: ProviderRuntimeSettings;
-  private modelRegistry: ModelRegistry | null = null;
-
-  constructor(options: PiDirectAgentClientOptions) {
-    this.logger = options.logger;
-    this.runtimeSettings = options.runtimeSettings;
-  }
-
-  private async getSessionServices(cwd: string, agentDir?: string): Promise<AgentSessionServices> {
-    return createAgentSessionServices({
-      cwd,
-      ...(agentDir ? { agentDir } : {}),
-      ...(this.modelRegistry ? { modelRegistry: this.modelRegistry } : {}),
-    });
-  }
-
-  private resolveConfiguredModel(
-    registry: PiDirectModelRegistry,
-    modelId: string | null | undefined,
-  ): Model<Api> | undefined {
-    const parsedReference = parseModelReference(modelId ?? null);
-    if (!parsedReference) {
-      return undefined;
-    }
-
-    return findModelInRegistry(registry, parsedReference);
-  }
-
-  private async createSdkRuntime(
-    config: AgentSessionConfig,
-    sessionManager: SessionManager,
-    options: { defaultThinkingLevel?: ThinkingLevel } = {},
-  ): Promise<PiDirectSessionResult> {
-    const createRuntime: CreateAgentSessionRuntimeFactory = async ({
-      cwd,
-      agentDir,
-      sessionManager: runtimeSessionManager,
-      sessionStartEvent,
-    }) => {
-      const thinkingLevel =
-        normalizePiThinkingOption(config.thinkingOptionId) ?? options.defaultThinkingLevel;
-      const services = await this.getSessionServices(cwd, agentDir);
-      const model = this.resolveConfiguredModel(services.modelRegistry, config.model);
-
-      return {
-        ...(await createAgentSessionFromServices({
-          services,
-          sessionManager: runtimeSessionManager,
-          sessionStartEvent,
-          ...(thinkingLevel ? { thinkingLevel } : {}),
-          ...(model ? { model } : {}),
-        })),
-        services,
-        diagnostics: services.diagnostics,
-      };
-    };
-
-    const runtime = await createAgentSessionRuntime(createRuntime, {
-      cwd: sessionManager.getCwd(),
-      agentDir: getAgentDir(),
-      sessionManager,
-    });
-    await runtime.session.bindExtensions({});
-    applySystemPrompt(runtime.session, config.systemPrompt);
-    return { runtime, modelRegistry: runtime.services.modelRegistry };
-  }
-
-  async createSession(
-    config: AgentSessionConfig,
-    _launchContext?: AgentLaunchContext,
-  ): Promise<AgentSession> {
-    const { runtime, modelRegistry } = await this.createSdkRuntime(
-      config,
-      SessionManager.create(config.cwd),
-      {
-        defaultThinkingLevel: DEFAULT_PI_THINKING_LEVEL,
-      },
-    );
-    return new PiDirectAgentSession(runtime, modelRegistry, config);
-  }
-
-  async resumeSession(
-    handle: AgentPersistenceHandle,
-    overrides?: Partial<AgentSessionConfig>,
-    _launchContext?: AgentLaunchContext,
-  ): Promise<AgentSession> {
-    const sessionFile = handle.nativeHandle;
-    if (!sessionFile) {
-      throw new Error("Pi resume requires a native session file handle");
-    }
-
-    const initialManager = SessionManager.open(sessionFile);
-    const persistenceMetadata = parsePersistenceMetadata(handle.metadata);
-    const cwd = overrides?.cwd ?? persistenceMetadata.cwd ?? initialManager.getCwd();
-    const resumedManager = SessionManager.open(sessionFile, undefined, cwd);
-    const mergedConfig: AgentSessionConfig = {
-      provider: PI_PROVIDER,
-      cwd,
-      model: overrides?.model,
-      thinkingOptionId: overrides?.thinkingOptionId,
-      systemPrompt: overrides?.systemPrompt,
-      featureValues: overrides?.featureValues,
-      title: overrides?.title,
-      approvalPolicy: overrides?.approvalPolicy,
-      sandboxMode: overrides?.sandboxMode,
-      networkAccess: overrides?.networkAccess,
-      webSearch: overrides?.webSearch,
-      extra: overrides?.extra,
-      mcpServers: overrides?.mcpServers,
-      internal: overrides?.internal,
-      modeId: overrides?.modeId,
-    };
-
-    const { runtime, modelRegistry } = await this.createSdkRuntime(mergedConfig, resumedManager);
-    return new PiDirectAgentSession(runtime, modelRegistry, mergedConfig);
-  }
-
-  async listModels(options: ListModelsOptions): Promise<AgentModelDefinition[]> {
-    const services = await this.getSessionServices(options.cwd);
-    const models = services.modelRegistry.getAvailable().map((model) => ({
-      provider: PI_PROVIDER,
-      id: `${model.provider}/${model.id}`,
-      label: `${model.provider}/${model.name}`,
-      description: `${model.provider}/${model.id}`,
-      metadata: {
-        provider: model.provider,
-        modelId: model.id,
-      } satisfies AgentMetadata,
-      thinkingOptions: model.reasoning ? PI_THINKING_OPTIONS.map(mapThinkingOption) : undefined,
-      defaultThinkingOptionId: model.reasoning ? DEFAULT_PI_THINKING_LEVEL : undefined,
-    }));
-
-    return transformPiModels(models);
-  }
-
-  async listModes(_options: ListModesOptions): Promise<AgentMode[]> {
-    return [];
-  }
-
-  async isAvailable(): Promise<boolean> {
-    const command = this.runtimeSettings?.command;
-    if (command?.mode === "replace" && command.argv[0]) {
-      if (!existsSync(command.argv[0])) {
-        return false;
-      }
-    } else if (!(await isCommandAvailable(PI_BINARY_COMMAND))) {
-      return false;
-    }
-
-    const registry = ModelRegistry.create(AuthStorage.create());
-    return registry.getAvailable().length > 0;
-  }
-
-  async getDiagnostic(): Promise<{ diagnostic: string }> {
-    try {
-      const available = await this.isAvailable();
-      const binaryOverride = this.runtimeSettings?.command;
-      const binary =
-        binaryOverride?.mode === "replace" && binaryOverride.argv[0]
-          ? binaryOverride.argv[0]
-          : await findExecutable(PI_BINARY_COMMAND);
-      const version = binary ? await resolveBinaryVersion(binary) : "unknown";
-      const authConfigPath = join(homedir(), ".pi", "agent", "auth.json");
-      let modelsValue = "Not checked";
-      let status = formatDiagnosticStatus(available);
-      const registry = ModelRegistry.create(AuthStorage.create());
-      const configuredProviders = Array.from(
-        new Set(registry.getAvailable().map((model) => model.provider)),
-      ).sort();
-
-      if (available) {
-        try {
-          const models = await this.listModels({ cwd: homedir(), force: false });
-          modelsValue = String(models.length);
-        } catch (error) {
-          modelsValue = `Error - ${toDiagnosticErrorMessage(error)}`;
-          status = formatDiagnosticStatus(available, {
-            source: "model fetch",
-            cause: error,
-          });
-        }
-      }
-
-      return {
-        diagnostic: formatProviderDiagnostic("Pi", [
-          { label: "Binary", value: binary ?? "not found" },
-          { label: "Version", value: version },
-          {
-            label: "Configured providers",
-            value: configuredProviders.length > 0 ? configuredProviders.join(", ") : "none",
-          },
-          {
-            label: "Auth config (~/.pi/agent/auth.json)",
-            value: existsSync(authConfigPath) ? "found" : "not found",
-          },
-          { label: "Models", value: modelsValue },
-          { label: "Status", value: status },
-        ]),
-      };
-    } catch (error) {
-      this.logger.debug({ err: error }, "Pi diagnostic lookup failed");
-      return {
-        diagnostic: formatProviderDiagnosticError("Pi", error),
-      };
-    }
-  }
-}
diff --git a/packages/server/src/server/agent/providers/pi-session-recovery-policy.test.ts b/packages/server/src/server/agent/providers/pi-session-recovery-policy.test.ts
deleted file mode 100644
index 302b7f075..000000000
--- a/packages/server/src/server/agent/providers/pi-session-recovery-policy.test.ts
+++ /dev/null
@@ -1,115 +0,0 @@
-import { describe, expect, test, vi } from "vitest";
-
-import {
-  applyPiSessionRecoveryPolicy,
-  type PiSessionRecoveryPolicySession,
-} from "./pi-session-recovery-policy.js";
-
-function createRecoverySession(
-  options: {
-    messages?: PiSessionRecoveryPolicySession["messages"];
-    errorMessage?: string | null;
-    compact?: () => Promise<void>;
-  } = {},
-): PiSessionRecoveryPolicySession {
-  return {
-    messages: options.messages ?? [],
-    agent: {
-      state: {
-        errorMessage: options.errorMessage ?? null,
-      },
-    },
-    compact: options.compact ?? vi.fn(async () => undefined),
-  };
-}
-
-describe("applyPiSessionRecoveryPolicy", () => {
-  test("compacts sessions that ended on Pi Copilot short 413 overflow", async () => {
-    const compact = vi.fn(async () => undefined);
-    const session = createRecoverySession({
-      messages: [
-        {
-          role: "assistant",
-          stopReason: "error",
-          errorMessage: "413 failed to parse request",
-        },
-      ],
-      compact,
-    });
-
-    const result = await applyPiSessionRecoveryPolicy(session);
-
-    expect(result).toEqual({ applied: true, policyId: "piCopilot413" });
-    expect(compact).toHaveBeenCalledTimes(1);
-  });
-
-  test("uses Pi agent error state when message history has no matching assistant error", async () => {
-    const compact = vi.fn(async () => undefined);
-    const session = createRecoverySession({
-      messages: [{ role: "user" }],
-      errorMessage: "  413 failed to parse request  ",
-      compact,
-    });
-
-    const result = await applyPiSessionRecoveryPolicy(session);
-
-    expect(result).toEqual({ applied: true, policyId: "piCopilot413" });
-    expect(compact).toHaveBeenCalledTimes(1);
-  });
-
-  test("does not compact unrelated Pi errors", async () => {
-    const compact = vi.fn(async () => undefined);
-    const session = createRecoverySession({
-      messages: [
-        {
-          role: "assistant",
-          stopReason: "error",
-          errorMessage: "413 unrelated provider error",
-        },
-      ],
-      compact,
-    });
-
-    const result = await applyPiSessionRecoveryPolicy(session);
-
-    expect(result).toEqual({ applied: false });
-    expect(compact).not.toHaveBeenCalled();
-  });
-
-  test("treats already-compacted sessions as recovered", async () => {
-    const session = createRecoverySession({
-      messages: [
-        {
-          role: "assistant",
-          stopReason: "error",
-          errorMessage: "413 failed to parse request",
-        },
-      ],
-      compact: vi.fn(async () => {
-        throw new Error("Already compacted");
-      }),
-    });
-
-    await expect(applyPiSessionRecoveryPolicy(session)).resolves.toEqual({
-      applied: true,
-      policyId: "piCopilot413",
-    });
-  });
-
-  test("surfaces unexpected compaction failures", async () => {
-    const session = createRecoverySession({
-      messages: [
-        {
-          role: "assistant",
-          stopReason: "error",
-          errorMessage: "413 failed to parse request",
-        },
-      ],
-      compact: vi.fn(async () => {
-        throw new Error("disk exploded");
-      }),
-    });
-
-    await expect(applyPiSessionRecoveryPolicy(session)).rejects.toThrow("disk exploded");
-  });
-});
diff --git a/packages/server/src/server/agent/providers/pi-session-recovery-policy.ts b/packages/server/src/server/agent/providers/pi-session-recovery-policy.ts
deleted file mode 100644
index 140eb6b09..000000000
--- a/packages/server/src/server/agent/providers/pi-session-recovery-policy.ts
+++ /dev/null
@@ -1,91 +0,0 @@
-import { toDiagnosticErrorMessage } from "./diagnostic-utils.js";
-
-export interface PiSessionRecoveryPolicySession {
-  readonly messages: readonly PiRecoveryMessage[];
-  readonly agent: {
-    readonly state: {
-      readonly errorMessage?: string | null;
-    };
-  };
-  compact(): Promise<unknown>;
-}
-
-interface PiRecoveryMessage {
-  readonly role: string;
-  readonly stopReason?: string;
-  readonly errorMessage?: string | null;
-}
-
-type PiSessionRecoveryPolicyId = "piCopilot413";
-
-interface PiSessionRecoveryPolicy {
-  readonly id: PiSessionRecoveryPolicyId;
-  shouldRecover(session: PiSessionRecoveryPolicySession): boolean;
-  recover(session: PiSessionRecoveryPolicySession): Promise<void>;
-}
-
-export interface PiSessionRecoveryResult {
-  readonly applied: boolean;
-  readonly policyId?: PiSessionRecoveryPolicyId;
-}
-
-// COMPAT(piCopilot413): added 2026-05-13 for Pi <= 0.73.1; target removal
-// 2026-11-13, once upstream @earendil-works/pi-ai recognizes this overflow.
-const PI_COPILOT_SHORT_413_OVERFLOW_PATTERN = /^413\s+failed to parse request$/i;
-
-const PI_SESSION_RECOVERY_POLICIES: readonly PiSessionRecoveryPolicy[] = [
-  {
-    id: "piCopilot413",
-    shouldRecover: shouldCompactForPiCopilot413,
-    recover: compactPiSession,
-  },
-];
-
-export async function applyPiSessionRecoveryPolicy(
-  session: PiSessionRecoveryPolicySession,
-): Promise<PiSessionRecoveryResult> {
-  const policy = PI_SESSION_RECOVERY_POLICIES.find((entry) => entry.shouldRecover(session));
-  if (!policy) {
-    return { applied: false };
-  }
-
-  await policy.recover(session);
-  return { applied: true, policyId: policy.id };
-}
-
-function shouldCompactForPiCopilot413(session: PiSessionRecoveryPolicySession): boolean {
-  return (
-    isPiCopilotShort413Overflow(getLatestAssistantErrorMessage(session)) ||
-    isPiCopilotShort413Overflow(session.agent.state.errorMessage)
-  );
-}
-
-function isPiCopilotShort413Overflow(errorMessage: string | null | undefined): boolean {
-  const normalized = errorMessage?.trim();
-  return normalized ? PI_COPILOT_SHORT_413_OVERFLOW_PATTERN.test(normalized) : false;
-}
-
-function getLatestAssistantErrorMessage(session: PiSessionRecoveryPolicySession): string | null {
-  for (let index = session.messages.length - 1; index >= 0; index -= 1) {
-    const message = session.messages[index];
-    if (message.role !== "assistant") {
-      continue;
-    }
-    return message.stopReason === "error" ? (message.errorMessage?.trim() ?? null) : null;
-  }
-  return null;
-}
-
-async function compactPiSession(session: PiSessionRecoveryPolicySession): Promise<void> {
-  try {
-    await session.compact();
-  } catch (error) {
-    if (!isHarmlessPiCompactionError(error)) {
-      throw error;
-    }
-  }
-}
-
-function isHarmlessPiCompactionError(error: unknown): boolean {
-  return /already compacted|nothing to compact/i.test(toDiagnosticErrorMessage(error));
-}
diff --git a/packages/server/src/server/agent/providers/pi/agent.test.ts b/packages/server/src/server/agent/providers/pi/agent.test.ts
new file mode 100644
index 000000000..30a2d6d55
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/agent.test.ts
@@ -0,0 +1,489 @@
+import { existsSync, mkdirSync, mkdtempSync, readFileSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import pino from "pino";
+import { describe, expect, test } from "vitest";
+
+import type { AgentSessionConfig, AgentStreamEvent } from "../../agent-sdk-types.js";
+import { PiRpcAgentClient, PiRpcAgentSession, transformPiModels } from "./agent.js";
+import { FakePi } from "./test-utils/fake-pi.js";
+
+function createClient(pi = new FakePi()): PiRpcAgentClient {
+  return new PiRpcAgentClient({
+    logger: pino({ level: "silent" }),
+    runtime: pi,
+  });
+}
+
+function createClientWithPiAgentDir(agentDir: string): PiRpcAgentClient {
+  return new PiRpcAgentClient({
+    logger: pino({ level: "silent" }),
+    runtime: new FakePi(),
+    runtimeSettings: { env: { PI_CODING_AGENT_DIR: agentDir } },
+  });
+}
+
+function createConfig(overrides: Partial<AgentSessionConfig> = {}): AgentSessionConfig {
+  return {
+    provider: "pi",
+    cwd: "/tmp/paseo-pi-rpc-test",
+    ...overrides,
+  };
+}
+
+async function createSession(pi = new FakePi()): Promise<{
+  pi: FakePi;
+  session: PiRpcAgentSession;
+  events: SessionEvents;
+}> {
+  const client = createClient(pi);
+  const session = (await client.createSession(createConfig())) as PiRpcAgentSession;
+  const events = new SessionEvents(session);
+  return { pi, session, events };
+}
+
+class SessionEvents {
+  private readonly events: AgentStreamEvent[] = [];
+  private readonly waiters: Array<{
+    predicate: (event: AgentStreamEvent) => boolean;
+    resolve: (event: AgentStreamEvent) => void;
+  }> = [];
+
+  constructor(session: PiRpcAgentSession) {
+    session.subscribe((event) => {
+      this.events.push(event);
+      for (let index = 0; index < this.waiters.length; index += 1) {
+        const waiter = this.waiters[index];
+        if (waiter.predicate(event)) {
+          this.waiters.splice(index, 1);
+          index -= 1;
+          waiter.resolve(event);
+        }
+      }
+    });
+  }
+
+  timelineItems() {
+    return this.events
+      .filter(
+        (event): event is Extract<AgentStreamEvent, { type: "timeline" }> =>
+          event.type === "timeline",
+      )
+      .map((event) => event.item);
+  }
+
+  nextTurnCompletion(): Promise<Extract<AgentStreamEvent, { type: "turn_completed" }>> {
+    return this.nextEvent(
+      (event): event is Extract<AgentStreamEvent, { type: "turn_completed" }> =>
+        event.type === "turn_completed",
+    );
+  }
+
+  nextTurnFailure(): Promise<Extract<AgentStreamEvent, { type: "turn_failed" }>> {
+    return this.nextEvent(
+      (event): event is Extract<AgentStreamEvent, { type: "turn_failed" }> =>
+        event.type === "turn_failed",
+    );
+  }
+
+  private nextEvent<T extends AgentStreamEvent>(
+    predicate: (event: AgentStreamEvent) => event is T,
+  ): Promise<T> {
+    const existing = this.events.find(predicate);
+    if (existing) {
+      return Promise.resolve(existing);
+    }
+    return new Promise((resolve) => {
+      this.waiters.push({
+        predicate,
+        resolve: (event) => resolve(event as T),
+      });
+    });
+  }
+}
+
+describe("PiRpcAgentSession", () => {
+  test("streams assistant text, reasoning, and tool calls from Pi events", async () => {
+    const { pi, session, events } = await createSession();
+    const fakeSession = pi.latestSession();
+
+    await session.startTurn("hello");
+    fakeSession.emit({
+      type: "message_update",
+      message: { role: "assistant", content: [] },
+      assistantMessageEvent: { type: "text_delta", delta: "hello" },
+    });
+    fakeSession.emit({
+      type: "message_update",
+      message: { role: "assistant", content: [] },
+      assistantMessageEvent: { type: "thinking_delta", delta: "thinking" },
+    });
+    fakeSession.emit({
+      type: "tool_execution_start",
+      toolCallId: "tool-1",
+      toolName: "bash",
+      args: { command: "echo hi" },
+    });
+    fakeSession.emit({
+      type: "tool_execution_end",
+      toolCallId: "tool-1",
+      toolName: "bash",
+      result: { output: "hi\n", exitCode: 0 },
+      isError: false,
+    });
+    fakeSession.finishTurn();
+
+    await events.nextTurnCompletion();
+
+    expect(events.timelineItems()).toEqual([
+      { type: "assistant_message", text: "hello" },
+      { type: "reasoning", text: "thinking" },
+      {
+        type: "tool_call",
+        callId: "tool-1",
+        name: "bash",
+        status: "running",
+        detail: { type: "shell", command: "echo hi" },
+        error: null,
+      },
+      {
+        type: "tool_call",
+        callId: "tool-1",
+        name: "bash",
+        status: "completed",
+        detail: { type: "shell", command: "echo hi", output: "hi\n", exitCode: 0 },
+        error: null,
+      },
+    ]);
+  });
+
+  test("resumes by launching Pi with the persisted session file and cwd metadata", async () => {
+    const pi = new FakePi();
+    const client = createClient(pi);
+
+    await client.resumeSession(
+      {
+        provider: "pi",
+        sessionId: "pi-session-1",
+        nativeHandle: "/tmp/native-pi-session.jsonl",
+        metadata: {
+          cwd: "/workspace/project",
+          model: "openrouter/model-a",
+          thinkingOptionId: "high",
+        },
+      },
+      {},
+    );
+
+    expect(pi.recordedLaunches).toEqual([
+      expect.objectContaining({
+        cwd: "/workspace/project",
+        session: "/tmp/native-pi-session.jsonl",
+        argv: [
+          "pi",
+          "--mode",
+          "rpc",
+          "--model",
+          "openrouter/model-a",
+          "--thinking",
+          "high",
+          "--session",
+          "/tmp/native-pi-session.jsonl",
+        ],
+      }),
+    ]);
+  });
+
+  test("creates Pi sessions with agent and daemon system prompts appended", async () => {
+    const pi = new FakePi();
+    const client = createClient(pi);
+
+    await client.createSession(
+      createConfig({
+        systemPrompt: "Agent prompt",
+        daemonAppendSystemPrompt: "Daemon prompt",
+      }),
+    );
+
+    expect(pi.recordedLaunches[0]).toEqual(
+      expect.objectContaining({
+        cwd: "/tmp/paseo-pi-rpc-test",
+        systemPrompt: "Agent prompt\n\nDaemon prompt",
+        argv: [
+          "pi",
+          "--mode",
+          "rpc",
+          "--thinking",
+          "medium",
+          "--append-system-prompt",
+          "Agent prompt\n\nDaemon prompt",
+        ],
+      }),
+    );
+  });
+
+  test("resumes Pi sessions with daemon system prompts appended", async () => {
+    const pi = new FakePi();
+    const client = createClient(pi);
+
+    await client.resumeSession(
+      {
+        provider: "pi",
+        sessionId: "pi-session-1",
+        nativeHandle: "/tmp/native-pi-session.jsonl",
+        metadata: {
+          cwd: "/workspace/project",
+          model: "openrouter/model-a",
+          thinkingOptionId: "high",
+          systemPrompt: "Agent prompt",
+        },
+      },
+      {
+        daemonAppendSystemPrompt: "Daemon prompt",
+      },
+    );
+
+    expect(pi.recordedLaunches).toEqual([
+      expect.objectContaining({
+        cwd: "/workspace/project",
+        session: "/tmp/native-pi-session.jsonl",
+        systemPrompt: "Agent prompt\n\nDaemon prompt",
+        argv: [
+          "pi",
+          "--mode",
+          "rpc",
+          "--model",
+          "openrouter/model-a",
+          "--thinking",
+          "high",
+          "--session",
+          "/tmp/native-pi-session.jsonl",
+          "--append-system-prompt",
+          "Agent prompt\n\nDaemon prompt",
+        ],
+      }),
+    ]);
+  });
+
+  test("updates model and thinking through Pi runtime commands", async () => {
+    const { pi, session } = await createSession();
+    const fakeSession = pi.latestSession();
+    fakeSession.setModelResult = { provider: "openrouter", id: "model-a", name: "Model A" };
+
+    await session.setModel("openrouter/model-a");
+    await session.setThinkingOption("high");
+
+    expect(fakeSession.setModelRequests).toEqual([{ provider: "openrouter", modelId: "model-a" }]);
+    expect(fakeSession.setThinkingLevelRequests).toEqual(["high"]);
+  });
+
+  test("fails the active turn when the Pi process exits mid-turn", async () => {
+    const { pi, session, events } = await createSession();
+
+    await session.startTurn("hello");
+    pi.latestSession().emit({ type: "process_exit", error: "Pi exited" });
+
+    await expect(events.nextTurnFailure()).resolves.toMatchObject({
+      error: "Pi exited",
+    });
+  });
+});
+
+describe("PiRpcAgentClient", () => {
+  test("lists models from a short-lived Pi session in the requested cwd", async () => {
+    const pi = new FakePi();
+    const client = createClient(pi);
+    const modelsPromise = client.listModels({ cwd: "/workspace/with-extension", force: false });
+    pi.latestSession().models = [
+      {
+        provider: "openrouter",
+        id: "google/gemini-2.5-flash-lite",
+        name: "google/gemini-2.5-flash-lite",
+        reasoning: true,
+      },
+    ];
+
+    await expect(modelsPromise).resolves.toMatchObject([
+      {
+        provider: "pi",
+        id: "openrouter/google/gemini-2.5-flash-lite",
+        label: "gemini-2.5-flash-lite",
+        defaultThinkingOptionId: "medium",
+      },
+    ]);
+    expect(pi.recordedLaunches[0]).toMatchObject({ cwd: "/workspace/with-extension" });
+  });
+
+  test("maps extension, prompt, and skill commands to Paseo slash commands", async () => {
+    const { pi, session } = await createSession();
+    pi.latestSession().commands = [
+      { name: "review", description: "Review changes", source: "extension" },
+      { name: "fix-tests", description: "Fix tests", source: "prompt" },
+      { name: "skill:docs", description: "Read docs", source: "skill" },
+    ];
+
+    await expect(session.listCommands()).resolves.toEqual([
+      { name: "review", description: "Review changes", argumentHint: "" },
+      { name: "fix-tests", description: "Fix tests", argumentHint: "" },
+      { name: "skill:docs", description: "Read docs", argumentHint: "" },
+    ]);
+  });
+
+  test("injects MCP servers through pi-mcp-adapter when the extension is loaded", async () => {
+    const pi = new FakePi();
+    pi.queueCommands([
+      {
+        name: "mcp",
+        description: "Show MCP server status",
+        source: "extension",
+        sourceInfo: { source: "npm:pi-mcp-adapter" },
+      },
+    ]);
+    const client = createClient(pi);
+
+    const session = await client.createSession(
+      createConfig({
+        mcpServers: {
+          paseo: {
+            type: "http",
+            url: "http://127.0.0.1:6767/mcp/agents?callerAgentId=agent-1",
+          },
+          localSecret: {
+            type: "stdio",
+            command: "node",
+            args: ["secret-server.js"],
+            env: { SECRET_NUMBER: "314159" },
+          },
+        },
+      }),
+    );
+
+    expect(pi.recordedLaunches).toHaveLength(2);
+    expect(pi.recordedLaunches[0]).toMatchObject({
+      cwd: "/tmp/paseo-pi-rpc-test",
+      argv: ["pi", "--mode", "rpc"],
+    });
+    const actualLaunch = pi.recordedLaunches[1];
+    expect(actualLaunch.argv).toEqual([
+      "pi",
+      "--mode",
+      "rpc",
+      "--thinking",
+      "medium",
+      "--mcp-config",
+      actualLaunch.mcpConfigPath,
+    ]);
+    expect(session.capabilities.supportsMcpServers).toBe(true);
+
+    const configPath = actualLaunch.mcpConfigPath;
+    expect(configPath).toEqual(expect.any(String));
+    const injectedConfig = JSON.parse(readFileSync(configPath!, "utf8")) as {
+      mcpServers: Record<string, unknown>;
+    };
+    expect(injectedConfig).toEqual({
+      mcpServers: {
+        paseo: {
+          url: "http://127.0.0.1:6767/mcp/agents?callerAgentId=agent-1",
+          auth: false,
+          oauth: false,
+        },
+        localSecret: {
+          command: "node",
+          args: ["secret-server.js"],
+          env: { SECRET_NUMBER: "314159" },
+        },
+      },
+    });
+
+    await session.close();
+    expect(existsSync(configPath!)).toBe(false);
+  });
+
+  test("does not pass MCP config when pi-mcp-adapter is not loaded", async () => {
+    const pi = new FakePi();
+    pi.queueCommands([]);
+    const client = createClient(pi);
+
+    const session = await client.createSession(
+      createConfig({
+        mcpServers: {
+          paseo: {
+            type: "http",
+            url: "http://127.0.0.1:6767/mcp/agents?callerAgentId=agent-1",
+          },
+        },
+      }),
+    );
+
+    expect(pi.recordedLaunches).toHaveLength(2);
+    expect(pi.recordedLaunches[1]?.argv).toEqual(["pi", "--mode", "rpc", "--thinking", "medium"]);
+    expect(pi.recordedLaunches[1]?.mcpConfigPath).toBeUndefined();
+    expect(session.capabilities.supportsMcpServers).toBe(false);
+  });
+
+  test("lists persisted Pi sessions from the configured Pi agent directory", async () => {
+    const root = mkdtempSync(path.join(tmpdir(), "paseo-pi-client-"));
+    const cwd = path.join(root, "workspace");
+    const agentDir = path.join(root, "agent");
+    const sessionsDir = path.join(agentDir, "sessions", "--workspace--");
+    mkdirSync(sessionsDir, { recursive: true });
+    const sessionFile = path.join(sessionsDir, "20260101_session.jsonl");
+    writeFileSync(
+      sessionFile,
+      [
+        JSON.stringify({
+          type: "session",
+          version: 3,
+          id: "pi-session",
+          timestamp: "2026-01-01T00:00:00.000Z",
+          cwd,
+        }),
+        JSON.stringify({
+          type: "message",
+          id: "entry-1",
+          parentId: null,
+          timestamp: "2026-01-01T00:00:01.000Z",
+          message: { role: "user", content: "remember this" },
+        }),
+      ].join("\n") + "\n",
+      "utf8",
+    );
+    const client = createClientWithPiAgentDir(agentDir);
+
+    await expect(client.listPersistedAgents({ cwd })).resolves.toMatchObject([
+      {
+        provider: "pi",
+        sessionId: "pi-session",
+        cwd,
+        persistence: {
+          provider: "pi",
+          sessionId: "pi-session",
+          nativeHandle: sessionFile,
+          metadata: { provider: "pi", cwd },
+        },
+        timeline: [{ type: "user_message", text: "remember this" }],
+      },
+    ]);
+  });
+});
+
+describe("transformPiModels", () => {
+  test("normalizes labels that include the upstream provider prefix", () => {
+    expect(
+      transformPiModels([
+        {
+          provider: "pi",
+          id: "openrouter/google/gemini-2.5-flash-lite",
+          label: "openrouter/google/gemini_2.5 flash lite",
+        },
+      ]),
+    ).toEqual([
+      {
+        provider: "pi",
+        id: "openrouter/google/gemini-2.5-flash-lite",
+        label: "gemini 2.5 flash lite",
+        description: "openrouter/google/gemini_2.5 flash lite",
+      },
+    ]);
+  });
+});
diff --git a/packages/server/src/server/agent/providers/pi/agent.ts b/packages/server/src/server/agent/providers/pi/agent.ts
new file mode 100644
index 000000000..3c4607c99
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/agent.ts
@@ -0,0 +1,1074 @@
+import { randomUUID } from "node:crypto";
+import { existsSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { homedir, tmpdir } from "node:os";
+import { join } from "node:path";
+import type { Logger } from "pino";
+
+import {
+  type AgentCapabilityFlags,
+  type AgentClient,
+  type AgentLaunchContext,
+  type AgentMetadata,
+  type AgentMode,
+  type AgentModelDefinition,
+  type McpServerConfig,
+  type AgentPermissionRequest,
+  type AgentPermissionResponse,
+  type AgentPersistenceHandle,
+  type AgentPromptInput,
+  type AgentRunOptions,
+  type AgentRunResult,
+  type AgentRuntimeInfo,
+  type AgentSession,
+  type AgentSessionConfig,
+  type AgentSlashCommand,
+  type AgentStreamEvent,
+  type AgentUsage,
+  type ListPersistedAgentsOptions,
+  type ListModesOptions,
+  type ListModelsOptions,
+  type PersistedAgentDescriptor,
+} from "../../agent-sdk-types.js";
+import { runProviderTurn } from "../provider-runner.js";
+import type { ProviderRuntimeSettings } from "../../provider-launch-config.js";
+import { renderPromptAttachmentAsText } from "../../prompt-attachments.js";
+import { composeSystemPromptParts } from "../../system-prompt.js";
+import { findExecutable } from "../../../../utils/executable.js";
+import {
+  formatDiagnosticStatus,
+  formatProviderDiagnostic,
+  formatProviderDiagnosticError,
+  resolveBinaryVersion,
+  toDiagnosticErrorMessage,
+} from "../diagnostic-utils.js";
+import { streamPiHistory } from "./history-mapper.js";
+import { PiCliRuntime } from "./cli-runtime.js";
+import { listPiPersistedAgents } from "./session-descriptor.js";
+import type { PiRuntime, PiRuntimeSession } from "./runtime.js";
+import type {
+  PiAgentSessionEvent,
+  PiAgentMessage,
+  PiImageContent,
+  PiModel,
+  PiRpcSlashCommand,
+  PiRuntimeEvent,
+  PiSessionStats,
+  PiSessionState,
+  PiThinkingLevel,
+} from "./rpc-types.js";
+import {
+  mapToolDetail,
+  parseToolArgs,
+  parseToolResult,
+  resolveToolCallName,
+  type PiToolResult,
+  type PiTrackedToolCall,
+} from "./tool-call-mapper.js";
+
+const PI_PROVIDER = "pi";
+const DEFAULT_PI_THINKING_LEVEL: PiThinkingLevel = "medium";
+const PI_BINARY_COMMAND = process.env.PI_COMMAND ?? process.env.PI_ACP_PI_COMMAND ?? "pi";
+
+const PI_CAPABILITIES: AgentCapabilityFlags = {
+  supportsStreaming: true,
+  supportsSessionPersistence: true,
+  supportsDynamicModes: true,
+  supportsMcpServers: false,
+  supportsReasoningStream: true,
+  supportsToolInvocations: true,
+};
+
+const PI_THINKING_OPTIONS: ReadonlyArray<{
+  id: PiThinkingLevel;
+  label: string;
+  description: string;
+  isDefault?: boolean;
+}> = [
+  { id: "off", label: "Off", description: "No extra reasoning" },
+  { id: "minimal", label: "Minimal", description: "Light reasoning" },
+  { id: "low", label: "Low", description: "Faster reasoning" },
+  { id: "medium", label: "Medium", description: "Balanced reasoning", isDefault: true },
+  { id: "high", label: "High", description: "Deeper reasoning" },
+  { id: "xhigh", label: "XHigh", description: "Maximum reasoning" },
+] as const;
+
+interface PiRpcAgentClientOptions {
+  logger: Logger;
+  runtimeSettings?: ProviderRuntimeSettings;
+  runtime?: PiRuntime;
+}
+
+interface PiPromptPayload {
+  text: string;
+  images?: PiImageContent[];
+}
+
+interface PiModelReference {
+  provider?: string;
+  id: string;
+}
+
+interface PiPersistenceMetadata {
+  cwd?: string;
+  model?: string;
+  thinkingOptionId?: string;
+  systemPrompt?: string;
+}
+
+interface StartTurnResult {
+  turnId: string;
+}
+
+interface PiRpcAgentSessionOptions {
+  runtimeSession: PiRuntimeSession;
+  config: AgentSessionConfig;
+  initialState: PiSessionState;
+  capabilities: AgentCapabilityFlags;
+  cleanup?: () => void;
+}
+
+interface PiResumeConfig {
+  cwd: string;
+  model?: string;
+  thinkingOptionId?: string;
+  config: AgentSessionConfig;
+}
+
+interface PiMcpServerConfig {
+  command?: string;
+  args?: string[];
+  env?: Record<string, string>;
+  url?: string;
+  headers?: Record<string, string>;
+  auth?: false;
+  oauth?: false;
+}
+
+interface PiMcpConfigFile {
+  path: string;
+  cleanup: () => void;
+}
+
+function normalizePiModelLabel(label: string): string {
+  return label.trim().replace(/[_\s]+/g, " ");
+}
+
+export function transformPiModels(models: AgentModelDefinition[]): AgentModelDefinition[] {
+  return models.map((model) => {
+    if (!model.label.includes("/")) {
+      return model;
+    }
+
+    const segments = model.label.split("/").filter((segment) => segment.length > 0);
+    const rawLabel = segments.at(-1);
+    if (!rawLabel) {
+      return model;
+    }
+
+    return {
+      ...model,
+      label: normalizePiModelLabel(rawLabel),
+      description: model.description ?? model.label,
+    };
+  });
+}
+
+function isPiThinkingLevel(value: string | null | undefined): value is PiThinkingLevel {
+  return (
+    value === "off" ||
+    value === "minimal" ||
+    value === "low" ||
+    value === "medium" ||
+    value === "high" ||
+    value === "xhigh"
+  );
+}
+
+function normalizePiThinkingOption(value: string | null | undefined): PiThinkingLevel | null {
+  if (!value) {
+    return null;
+  }
+  return isPiThinkingLevel(value) ? value : null;
+}
+
+function mapThinkingOption(option: (typeof PI_THINKING_OPTIONS)[number]) {
+  const mappedOption = {
+    id: option.id,
+    label: option.label,
+    description: option.description,
+  };
+  if (option.isDefault) {
+    return {
+      ...mappedOption,
+      isDefault: true,
+    };
+  }
+  return mappedOption;
+}
+
+function toAgentUsage(stats: PiSessionStats): AgentUsage | undefined {
+  const inputTokens = stats.tokens?.input ?? 0;
+  const cachedInputTokens = stats.tokens?.cacheRead ?? 0;
+  const outputTokens = stats.tokens?.output ?? 0;
+  const totalCostUsd = stats.cost ?? 0;
+  const contextWindowMaxTokens = stats.contextUsage?.contextWindow ?? undefined;
+  const contextWindowUsedTokens = stats.contextUsage?.tokens ?? undefined;
+
+  if (
+    inputTokens === 0 &&
+    cachedInputTokens === 0 &&
+    outputTokens === 0 &&
+    totalCostUsd === 0 &&
+    contextWindowMaxTokens === undefined &&
+    contextWindowUsedTokens === undefined
+  ) {
+    return undefined;
+  }
+
+  return {
+    inputTokens,
+    cachedInputTokens,
+    outputTokens,
+    totalCostUsd,
+    ...(typeof contextWindowMaxTokens === "number" ? { contextWindowMaxTokens } : {}),
+    ...(typeof contextWindowUsedTokens === "number" ? { contextWindowUsedTokens } : {}),
+  };
+}
+
+function convertPromptInput(prompt: AgentPromptInput): PiPromptPayload {
+  if (typeof prompt === "string") {
+    return { text: prompt };
+  }
+
+  const textParts: string[] = [];
+  const images: PiImageContent[] = [];
+
+  for (const block of prompt) {
+    if (block.type === "text") {
+      textParts.push(block.text);
+      continue;
+    }
+
+    if (block.type === "image") {
+      images.push({
+        type: "image",
+        data: block.data,
+        mimeType: block.mimeType,
+      });
+      continue;
+    }
+
+    textParts.push(renderPromptAttachmentAsText(block));
+  }
+
+  const payload: PiPromptPayload = {
+    text: textParts.join("\n\n"),
+  };
+  if (images.length > 0) {
+    payload.images = images;
+  }
+  return payload;
+}
+
+function parseModelReference(modelId: string | null): PiModelReference | null {
+  if (!modelId) {
+    return null;
+  }
+  if (modelId.includes("/")) {
+    const [provider, ...rest] = modelId.split("/");
+    const id = rest.join("/");
+    if (provider && id) {
+      return { provider, id };
+    }
+  }
+  if (modelId.includes(":")) {
+    const [provider, ...rest] = modelId.split(":");
+    const id = rest.join(":");
+    if (provider && id) {
+      return { provider, id };
+    }
+  }
+  return { id: modelId };
+}
+
+function parsePersistenceMetadata(metadata: AgentMetadata | undefined): PiPersistenceMetadata {
+  if (!metadata) {
+    return {};
+  }
+  return {
+    ...(typeof metadata.cwd === "string" ? { cwd: metadata.cwd } : {}),
+    ...(typeof metadata.model === "string" ? { model: metadata.model } : {}),
+    ...(typeof metadata.thinkingOptionId === "string"
+      ? { thinkingOptionId: metadata.thinkingOptionId }
+      : {}),
+    ...(typeof metadata.systemPrompt === "string" ? { systemPrompt: metadata.systemPrompt } : {}),
+  };
+}
+
+function buildResumeConfig(
+  metadata: PiPersistenceMetadata,
+  overrides: Partial<AgentSessionConfig> | undefined,
+): PiResumeConfig {
+  const overrideConfig = overrides ?? {};
+  const cwd = overrideConfig.cwd ?? metadata.cwd ?? process.cwd();
+  const model = overrideConfig.model ?? metadata.model;
+  const thinkingOptionId = overrideConfig.thinkingOptionId ?? metadata.thinkingOptionId;
+  return {
+    cwd,
+    model,
+    thinkingOptionId,
+    config: {
+      ...overrideConfig,
+      provider: PI_PROVIDER,
+      cwd,
+      model,
+      thinkingOptionId,
+      systemPrompt: overrideConfig.systemPrompt ?? metadata.systemPrompt,
+    },
+  };
+}
+
+function toPiMcpConfig(config: McpServerConfig): PiMcpServerConfig {
+  if (config.type === "stdio") {
+    return {
+      command: config.command,
+      ...(config.args ? { args: config.args } : {}),
+      ...(config.env ? { env: config.env } : {}),
+    };
+  }
+
+  return {
+    url: config.url,
+    ...(config.headers ? { headers: config.headers } : {}),
+    auth: false,
+    oauth: false,
+  };
+}
+
+function createPiMcpConfigFile(servers: Record<string, McpServerConfig>): PiMcpConfigFile {
+  const dir = mkdtempSync(join(tmpdir(), "paseo-pi-mcp-"));
+  const filePath = join(dir, "mcp.json");
+  const mcpServers: Record<string, PiMcpServerConfig> = {};
+  for (const [name, serverConfig] of Object.entries(servers)) {
+    mcpServers[name] = toPiMcpConfig(serverConfig);
+  }
+  writeFileSync(filePath, `${JSON.stringify({ mcpServers }, null, 2)}\n`, "utf8");
+  return {
+    path: filePath,
+    cleanup: () => rmSync(dir, { recursive: true, force: true }),
+  };
+}
+
+function isPiMcpAdapterCommand(command: PiRpcSlashCommand): boolean {
+  if (command.source !== "extension" || !/^mcp(?::\d+)?$/.test(command.name)) {
+    return false;
+  }
+  if (!command.sourceInfo) {
+    return true;
+  }
+  return JSON.stringify(command.sourceInfo).includes("pi-mcp-adapter");
+}
+
+function withPiMcpCapability(supportsMcpServers: boolean): AgentCapabilityFlags {
+  return {
+    ...PI_CAPABILITIES,
+    supportsMcpServers,
+  };
+}
+
+function isPiRequestAbortError(error: unknown): boolean {
+  if (error instanceof Error && error.name === "AbortError") {
+    return true;
+  }
+
+  return /\brequest was aborted\b|\babort(ed)?\b/i.test(toDiagnosticErrorMessage(error));
+}
+
+function resolveThinkingOptionId(
+  cachedThinkingOptionId: string | null,
+  sessionThinkingLevel: PiThinkingLevel,
+): PiThinkingLevel | null {
+  const currentThinking = cachedThinkingOptionId ?? sessionThinkingLevel;
+  return normalizePiThinkingOption(currentThinking);
+}
+
+function modelToId(model: PiModel | null | undefined): string | null {
+  return model?.provider && model.id ? `${model.provider}/${model.id}` : null;
+}
+
+function latestPiErrorMessage(messages: PiAgentMessage[]): string | null {
+  const latestAssistant = messages.findLast((message) => message.role === "assistant");
+  return latestAssistant && "errorMessage" in latestAssistant
+    ? (latestAssistant.errorMessage ?? null)
+    : null;
+}
+
+function mapPiModel(model: PiModel): AgentModelDefinition {
+  return {
+    provider: PI_PROVIDER,
+    id: `${model.provider}/${model.id}`,
+    label: `${model.provider}/${model.name ?? model.id}`,
+    description: `${model.provider}/${model.id}`,
+    metadata: {
+      provider: model.provider,
+      modelId: model.id,
+    },
+    thinkingOptions: model.reasoning ? PI_THINKING_OPTIONS.map(mapThinkingOption) : undefined,
+    defaultThinkingOptionId: model.reasoning ? DEFAULT_PI_THINKING_LEVEL : undefined,
+  };
+}
+
+function createRuntime(logger: Logger, runtimeSettings?: ProviderRuntimeSettings): PiRuntime {
+  return new PiCliRuntime({ logger, runtimeSettings });
+}
+
+export class PiRpcAgentSession implements AgentSession {
+  readonly provider = PI_PROVIDER;
+  readonly capabilities: AgentCapabilityFlags;
+
+  private readonly subscribers = new Set<(event: AgentStreamEvent) => void>();
+  private readonly activeToolCalls = new Map<string, PiTrackedToolCall>();
+  private activeTurnId: string | null = null;
+  private lastKnownThinkingOptionId: string | null;
+  private state: PiSessionState;
+  private closed = false;
+
+  constructor(options: PiRpcAgentSessionOptions) {
+    this.runtimeSession = options.runtimeSession;
+    this.config = options.config;
+    this.state = options.initialState;
+    this.capabilities = options.capabilities;
+    this.cleanup = options.cleanup;
+    this.lastKnownThinkingOptionId =
+      normalizePiThinkingOption(options.config.thinkingOptionId) ??
+      this.state.thinkingLevel ??
+      null;
+
+    this.runtimeSession.onEvent((event) => {
+      this.handleRuntimeEvent(event);
+    });
+  }
+
+  private readonly runtimeSession: PiRuntimeSession;
+  private readonly config: AgentSessionConfig;
+  private readonly cleanup?: () => void;
+
+  get id(): string | null {
+    return this.state.sessionId;
+  }
+
+  async run(prompt: AgentPromptInput, options?: AgentRunOptions): Promise<AgentRunResult> {
+    return runProviderTurn({
+      prompt,
+      runOptions: options,
+      startTurn: (p, o) => this.startTurn(p, o),
+      subscribe: (callback) => this.subscribe(callback),
+      getSessionId: () => this.state.sessionId,
+      reduceFinalText: ({ current, item }) =>
+        item.type === "assistant_message" ? `${current}${item.text}` : current,
+    });
+  }
+
+  async startTurn(prompt: AgentPromptInput, _options?: AgentRunOptions): Promise<StartTurnResult> {
+    if (this.activeTurnId) {
+      throw new Error("A Pi turn is already active");
+    }
+
+    const payload = convertPromptInput(prompt);
+    const turnId = randomUUID();
+    this.activeTurnId = turnId;
+
+    void this.runtimeSession.prompt(payload.text, payload.images).catch((error) => {
+      const failedTurnId = this.activeTurnId ?? turnId;
+      this.activeTurnId = null;
+      if (isPiRequestAbortError(error)) {
+        this.emit({
+          type: "turn_canceled",
+          provider: PI_PROVIDER,
+          turnId: failedTurnId,
+          reason: toDiagnosticErrorMessage(error),
+        });
+        return;
+      }
+      this.emit({
+        type: "turn_failed",
+        provider: PI_PROVIDER,
+        turnId: failedTurnId,
+        error: toDiagnosticErrorMessage(error),
+      });
+    });
+
+    return { turnId };
+  }
+
+  subscribe(callback: (event: AgentStreamEvent) => void): () => void {
+    this.subscribers.add(callback);
+    return () => {
+      this.subscribers.delete(callback);
+    };
+  }
+
+  async *streamHistory(): AsyncGenerator<AgentStreamEvent> {
+    yield* streamPiHistory(PI_PROVIDER, await this.runtimeSession.getMessages());
+  }
+
+  async getRuntimeInfo(): Promise<AgentRuntimeInfo> {
+    await this.refreshState();
+    return {
+      provider: PI_PROVIDER,
+      sessionId: this.state.sessionId,
+      model: modelToId(this.state.model),
+      thinkingOptionId: resolveThinkingOptionId(
+        this.lastKnownThinkingOptionId,
+        this.state.thinkingLevel,
+      ),
+      modeId: null,
+    };
+  }
+
+  async getAvailableModes(): Promise<AgentMode[]> {
+    return [];
+  }
+
+  async getCurrentMode(): Promise<string | null> {
+    return null;
+  }
+
+  async setMode(modeId: string): Promise<void> {
+    void modeId;
+    throw new Error("Pi does not expose selectable modes");
+  }
+
+  getPendingPermissions(): AgentPermissionRequest[] {
+    return [];
+  }
+
+  async respondToPermission(requestId: string, response: AgentPermissionResponse): Promise<void> {
+    void requestId;
+    void response;
+  }
+
+  describePersistence(): AgentPersistenceHandle | null {
+    return {
+      provider: PI_PROVIDER,
+      sessionId: this.state.sessionId,
+      nativeHandle: this.state.sessionFile,
+      metadata: {
+        cwd: this.config.cwd,
+        ...(this.config.model ? { model: this.config.model } : {}),
+        ...(this.config.thinkingOptionId ? { thinkingOptionId: this.config.thinkingOptionId } : {}),
+      },
+    };
+  }
+
+  async interrupt(): Promise<void> {
+    await this.runtimeSession.abort();
+  }
+
+  async close(): Promise<void> {
+    if (this.closed) {
+      return;
+    }
+    this.closed = true;
+    try {
+      await this.runtimeSession.close();
+    } finally {
+      this.cleanup?.();
+    }
+  }
+
+  async listCommands(): Promise<AgentSlashCommand[]> {
+    const commands = await this.runtimeSession.getCommands();
+    return commands.map((command) => ({
+      name: command.name,
+      description: command.description ?? command.source,
+      argumentHint: "",
+    }));
+  }
+
+  async setModel(modelId: string | null): Promise<void> {
+    const parsedReference = parseModelReference(modelId);
+    if (!parsedReference) {
+      return;
+    }
+    if (!parsedReference.provider) {
+      throw new Error(`Pi model id must include a provider: ${modelId}`);
+    }
+
+    const model = await this.runtimeSession.setModel(parsedReference.provider, parsedReference.id);
+    this.state = {
+      ...this.state,
+      model,
+    };
+    this.config.model = `${model.provider}/${model.id}`;
+  }
+
+  async setThinkingOption(thinkingOptionId: string | null): Promise<void> {
+    const thinkingLevel = normalizePiThinkingOption(thinkingOptionId) ?? DEFAULT_PI_THINKING_LEVEL;
+    await this.runtimeSession.setThinkingLevel(thinkingLevel);
+    this.lastKnownThinkingOptionId = thinkingLevel;
+    this.config.thinkingOptionId = thinkingLevel;
+    this.state = {
+      ...this.state,
+      thinkingLevel,
+    };
+  }
+
+  private emit(event: AgentStreamEvent): void {
+    for (const subscriber of this.subscribers) {
+      subscriber(event);
+    }
+  }
+
+  private currentTurnIdForEvent(): string | undefined {
+    return this.activeTurnId ?? undefined;
+  }
+
+  private handleRuntimeEvent(event: PiRuntimeEvent): void {
+    if (event.type === "extension_ui_request") {
+      this.runtimeSession.cancelExtensionUiRequest(event.id);
+      return;
+    }
+    if (event.type === "process_exit") {
+      this.handleProcessExit(event.error);
+      return;
+    }
+    this.handleSessionEvent(event);
+  }
+
+  private handleProcessExit(error: string): void {
+    if (!this.activeTurnId) {
+      return;
+    }
+    const turnId = this.activeTurnId;
+    this.activeTurnId = null;
+    this.emit({
+      type: "turn_failed",
+      provider: PI_PROVIDER,
+      turnId,
+      error,
+    });
+  }
+
+  private handleSessionEvent(event: PiAgentSessionEvent): void {
+    const turnId = this.currentTurnIdForEvent();
+
+    switch (event.type) {
+      case "agent_start":
+        this.emit({
+          type: "thread_started",
+          provider: PI_PROVIDER,
+          sessionId: this.state.sessionId,
+        });
+        return;
+      case "turn_start":
+        this.emit({
+          type: "turn_started",
+          provider: PI_PROVIDER,
+          turnId,
+        });
+        return;
+      case "message_update":
+        this.handleMessageUpdate(event, turnId);
+        return;
+      case "tool_execution_start": {
+        const toolCall = parseToolArgs(event.toolName, event.args);
+        this.activeToolCalls.set(event.toolCallId, toolCall);
+        this.emitToolCallEvent(event.toolCallId, toolCall, "running", null, null);
+        return;
+      }
+      case "tool_execution_update": {
+        const toolCall = this.activeToolCalls.get(event.toolCallId);
+        if (!toolCall) {
+          return;
+        }
+
+        const partialResult = parseToolResult(event.partialResult);
+        this.emitToolCallEvent(event.toolCallId, toolCall, "running", partialResult, null);
+        return;
+      }
+      case "tool_execution_end": {
+        const toolCall =
+          this.activeToolCalls.get(event.toolCallId) ?? parseToolArgs(event.toolName, null);
+        this.activeToolCalls.delete(event.toolCallId);
+
+        const result = parseToolResult(event.result);
+        const error = event.isError ? event.result : null;
+        const status = event.isError ? "failed" : "completed";
+        this.emitToolCallEvent(event.toolCallId, toolCall, status, result, error);
+        return;
+      }
+      case "compaction_start":
+        this.emit({
+          type: "timeline",
+          provider: PI_PROVIDER,
+          turnId,
+          item: {
+            type: "compaction",
+            status: "loading",
+            trigger: event.reason === "manual" ? "manual" : "auto",
+          },
+        });
+        return;
+      case "compaction_end":
+        this.emit({
+          type: "timeline",
+          provider: PI_PROVIDER,
+          turnId,
+          item: {
+            type: "compaction",
+            status: "completed",
+          },
+        });
+        return;
+      case "agent_end":
+        this.completeTurn(turnId, event.messages ?? []);
+        return;
+      default:
+        return;
+    }
+  }
+
+  private handleMessageUpdate(
+    event: Extract<PiAgentSessionEvent, { type: "message_update" }>,
+    turnId: string | undefined,
+  ): void {
+    if (event.message.role !== "assistant") {
+      return;
+    }
+    if (event.assistantMessageEvent.type === "text_delta") {
+      this.emit({
+        type: "timeline",
+        provider: PI_PROVIDER,
+        turnId,
+        item: {
+          type: "assistant_message",
+          text: event.assistantMessageEvent.delta ?? "",
+        },
+      });
+      return;
+    }
+    if (event.assistantMessageEvent.type === "thinking_delta") {
+      this.emit({
+        type: "timeline",
+        provider: PI_PROVIDER,
+        turnId,
+        item: {
+          type: "reasoning",
+          text: event.assistantMessageEvent.delta ?? "",
+        },
+      });
+    }
+  }
+
+  private emitToolCallEvent(
+    toolCallId: string,
+    toolCall: PiTrackedToolCall,
+    status: "running" | "completed" | "failed",
+    result: PiToolResult,
+    error: unknown,
+  ): void {
+    const turnId = this.currentTurnIdForEvent();
+    const detail = mapToolDetail(toolCall, result);
+    const baseItem = {
+      type: "tool_call" as const,
+      callId: toolCallId,
+      name: resolveToolCallName(toolCall, result),
+      detail,
+    };
+    const item =
+      status === "failed" ? { ...baseItem, status, error } : { ...baseItem, status, error: null };
+    this.emit({
+      type: "timeline",
+      provider: PI_PROVIDER,
+      turnId,
+      item,
+    });
+  }
+
+  private completeTurn(turnId: string | undefined, messages: PiAgentMessage[]): void {
+    this.activeTurnId = null;
+    const errorMessage = latestPiErrorMessage(messages);
+    if (typeof errorMessage === "string" && errorMessage.length > 0) {
+      this.emit({
+        type: "turn_failed",
+        provider: PI_PROVIDER,
+        turnId,
+        error: errorMessage,
+      });
+      return;
+    }
+    this.emit({
+      type: "turn_completed",
+      provider: PI_PROVIDER,
+      turnId,
+    });
+    void this.refreshAfterTurn(turnId);
+  }
+
+  private async refreshState(): Promise<void> {
+    this.state = await this.runtimeSession.getState();
+  }
+
+  private async refreshAfterTurn(turnId: string | undefined): Promise<void> {
+    await this.refreshState().catch(() => undefined);
+    const usage = await this.runtimeSession
+      .getSessionStats()
+      .then(toAgentUsage)
+      .catch(() => undefined);
+    if (usage) {
+      this.emit({
+        type: "usage_updated",
+        provider: PI_PROVIDER,
+        turnId,
+        usage,
+      });
+    }
+  }
+}
+
+export class PiRpcAgentClient implements AgentClient {
+  readonly provider = PI_PROVIDER;
+  readonly capabilities = PI_CAPABILITIES;
+
+  private readonly logger: Logger;
+  private readonly runtimeSettings?: ProviderRuntimeSettings;
+  private readonly runtime: PiRuntime;
+
+  constructor(options: PiRpcAgentClientOptions) {
+    this.logger = options.logger;
+    this.runtimeSettings = options.runtimeSettings;
+    this.runtime = options.runtime ?? createRuntime(options.logger, options.runtimeSettings);
+  }
+
+  async createSession(
+    config: AgentSessionConfig,
+    _launchContext?: AgentLaunchContext,
+  ): Promise<AgentSession> {
+    const mcpConfig = await this.prepareMcpConfig(config.cwd, config.mcpServers);
+    let runtimeSession: PiRuntimeSession;
+    try {
+      runtimeSession = await this.runtime.startSession({
+        cwd: config.cwd,
+        model: config.model,
+        thinkingOptionId:
+          normalizePiThinkingOption(config.thinkingOptionId) ?? DEFAULT_PI_THINKING_LEVEL,
+        systemPrompt: composeSystemPromptParts(
+          config.systemPrompt,
+          config.daemonAppendSystemPrompt,
+        ),
+        mcpConfigPath: mcpConfig?.path,
+      });
+    } catch (error) {
+      mcpConfig?.cleanup();
+      throw error;
+    }
+    try {
+      return new PiRpcAgentSession({
+        runtimeSession,
+        config,
+        initialState: await runtimeSession.getState(),
+        capabilities: withPiMcpCapability(mcpConfig !== null),
+        cleanup: mcpConfig?.cleanup,
+      });
+    } catch (error) {
+      await runtimeSession.close().catch(() => undefined);
+      mcpConfig?.cleanup();
+      throw error;
+    }
+  }
+
+  async resumeSession(
+    handle: AgentPersistenceHandle,
+    overrides?: Partial<AgentSessionConfig>,
+    _launchContext?: AgentLaunchContext,
+  ): Promise<AgentSession> {
+    const sessionFile = handle.nativeHandle;
+    if (!sessionFile) {
+      throw new Error("Pi resume requires a native session file handle");
+    }
+
+    const persistenceMetadata = parsePersistenceMetadata(handle.metadata);
+    const resumeConfig = buildResumeConfig(persistenceMetadata, overrides);
+
+    const mcpConfig = await this.prepareMcpConfig(resumeConfig.cwd, resumeConfig.config.mcpServers);
+    let runtimeSession: PiRuntimeSession;
+    try {
+      runtimeSession = await this.runtime.startSession({
+        cwd: resumeConfig.cwd,
+        session: sessionFile,
+        model: resumeConfig.model,
+        thinkingOptionId: normalizePiThinkingOption(resumeConfig.thinkingOptionId) ?? undefined,
+        systemPrompt: composeSystemPromptParts(
+          resumeConfig.config.systemPrompt,
+          resumeConfig.config.daemonAppendSystemPrompt,
+        ),
+        mcpConfigPath: mcpConfig?.path,
+      });
+    } catch (error) {
+      mcpConfig?.cleanup();
+      throw error;
+    }
+    try {
+      return new PiRpcAgentSession({
+        runtimeSession,
+        config: resumeConfig.config,
+        initialState: await runtimeSession.getState(),
+        capabilities: withPiMcpCapability(mcpConfig !== null),
+        cleanup: mcpConfig?.cleanup,
+      });
+    } catch (error) {
+      await runtimeSession.close().catch(() => undefined);
+      mcpConfig?.cleanup();
+      throw error;
+    }
+  }
+
+  async listModels(options: ListModelsOptions): Promise<AgentModelDefinition[]> {
+    const runtimeSession = await this.runtime.startSession({ cwd: options.cwd });
+    try {
+      return transformPiModels((await runtimeSession.getAvailableModels()).map(mapPiModel));
+    } finally {
+      await runtimeSession.close();
+    }
+  }
+
+  async listModes(_options: ListModesOptions): Promise<AgentMode[]> {
+    return [];
+  }
+
+  async listPersistedAgents(
+    options?: ListPersistedAgentsOptions,
+  ): Promise<PersistedAgentDescriptor[]> {
+    return await listPiPersistedAgents({
+      ...options,
+      runtimeSettings: this.runtimeSettings,
+    });
+  }
+
+  async isAvailable(): Promise<boolean> {
+    const binary = await this.resolvePiBinary();
+    if (!binary) {
+      return false;
+    }
+    const runtimeSession = await this.runtime.startSession({ cwd: homedir() }).catch(() => null);
+    if (!runtimeSession) {
+      return false;
+    }
+    try {
+      return (await runtimeSession.getAvailableModels()).length > 0;
+    } catch {
+      return false;
+    } finally {
+      await runtimeSession.close().catch(() => undefined);
+    }
+  }
+
+  async getDiagnostic(): Promise<{ diagnostic: string }> {
+    try {
+      const available = await this.isAvailable();
+      const binary = await this.resolvePiBinary();
+      const version = binary ? await resolveBinaryVersion(binary) : "unknown";
+      const authConfigPath = join(homedir(), ".pi", "agent", "auth.json");
+      let modelsValue = "Not checked";
+      let configuredProvidersValue = "none";
+      let mcpToolsValue = "Not checked";
+      let status = formatDiagnosticStatus(available);
+
+      if (binary) {
+        const runtimeSession = await this.runtime
+          .startSession({ cwd: homedir() })
+          .catch((error) => {
+            status = formatDiagnosticStatus(false, {
+              source: "startup",
+              cause: error,
+            });
+            return null;
+          });
+        if (runtimeSession) {
+          try {
+            const models = await runtimeSession.getAvailableModels();
+            modelsValue = String(models.length);
+            const configuredProviders = Array.from(
+              new Set(models.map((model) => model.provider)),
+            ).sort();
+            configuredProvidersValue =
+              configuredProviders.length > 0 ? configuredProviders.join(", ") : "none";
+            const commands = await runtimeSession.getCommands();
+            mcpToolsValue = commands.some(isPiMcpAdapterCommand)
+              ? "yes (pi-mcp-adapter loaded)"
+              : "no (install pi-mcp-adapter)";
+          } catch (error) {
+            modelsValue = `Error - ${toDiagnosticErrorMessage(error)}`;
+            mcpToolsValue = `Error - ${toDiagnosticErrorMessage(error)}`;
+            status = formatDiagnosticStatus(available, {
+              source: "model fetch",
+              cause: error,
+            });
+          } finally {
+            await runtimeSession.close().catch(() => undefined);
+          }
+        }
+      }
+
+      return {
+        diagnostic: formatProviderDiagnostic("Pi", [
+          { label: "Binary", value: binary ?? "not found" },
+          { label: "Version", value: version },
+          { label: "Configured providers", value: configuredProvidersValue },
+          {
+            label: "Auth config (~/.pi/agent/auth.json)",
+            value: existsSync(authConfigPath) ? "found" : "not found",
+          },
+          { label: "Models", value: modelsValue },
+          { label: "Paseo MCP tools", value: mcpToolsValue },
+          { label: "Status", value: status },
+        ]),
+      };
+    } catch (error) {
+      this.logger.debug({ err: error }, "Pi diagnostic lookup failed");
+      return {
+        diagnostic: formatProviderDiagnosticError("Pi", error),
+      };
+    }
+  }
+
+  private async prepareMcpConfig(
+    cwd: string,
+    servers: Record<string, McpServerConfig> | undefined,
+  ): Promise<PiMcpConfigFile | null> {
+    if (!servers || Object.keys(servers).length === 0) {
+      return null;
+    }
+    if (!(await this.detectMcpAdapter(cwd))) {
+      return null;
+    }
+    return createPiMcpConfigFile(servers);
+  }
+
+  private async detectMcpAdapter(cwd: string): Promise<boolean> {
+    const runtimeSession = await this.runtime.startSession({ cwd }).catch((error) => {
+      this.logger.debug({ err: error, cwd }, "Pi MCP adapter probe failed to start");
+      return null;
+    });
+    if (!runtimeSession) {
+      return false;
+    }
+    try {
+      return (await runtimeSession.getCommands()).some(isPiMcpAdapterCommand);
+    } catch (error) {
+      this.logger.debug({ err: error, cwd }, "Pi MCP adapter probe failed");
+      return false;
+    } finally {
+      await runtimeSession.close().catch(() => undefined);
+    }
+  }
+
+  private async resolvePiBinary(): Promise<string | null> {
+    const command = this.runtimeSettings?.command;
+    if (command?.mode === "replace" && command.argv[0]) {
+      return await findExecutable(command.argv[0]);
+    }
+    return await findExecutable(PI_BINARY_COMMAND);
+  }
+}
diff --git a/packages/server/src/server/agent/providers/pi/cli-runtime.test.ts b/packages/server/src/server/agent/providers/pi/cli-runtime.test.ts
new file mode 100644
index 000000000..bf10ee30d
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/cli-runtime.test.ts
@@ -0,0 +1,188 @@
+import type { ChildProcessWithoutNullStreams } from "node:child_process";
+import { EventEmitter } from "node:events";
+import { PassThrough } from "node:stream";
+import pino from "pino";
+import { describe, expect, test } from "vitest";
+
+import { PiCliRuntime } from "./cli-runtime.js";
+import type { PiRuntimeLaunch } from "./runtime.js";
+
+type PiChild = ChildProcessWithoutNullStreams & {
+  stdin: PassThrough;
+  stdout: PassThrough;
+  stderr: PassThrough;
+  killedSignals: Array<NodeJS.Signals | number | undefined>;
+};
+
+function createPiChild(): PiChild {
+  const child = Object.assign(new EventEmitter(), {
+    stdin: new PassThrough(),
+    stdout: new PassThrough(),
+    stderr: new PassThrough(),
+    exitCode: null,
+    signalCode: null,
+    killedSignals: [],
+  }) as PiChild;
+  child.kill = ((signal?: NodeJS.Signals | number) => {
+    child.killedSignals.push(signal);
+    queueMicrotask(() => child.emit("exit", null, signal ?? null));
+    return true;
+  }) as ChildProcessWithoutNullStreams["kill"];
+  return child;
+}
+
+function createRuntime(child: PiChild, launches: PiRuntimeLaunch[] = []): PiCliRuntime {
+  return new PiCliRuntime({
+    logger: pino({ level: "silent" }),
+    command: ["pi"],
+    spawnProcess: (launch) => {
+      launches.push(launch);
+      return child;
+    },
+  });
+}
+
+function replyToCommands(
+  child: PiChild,
+  handler: (command: Record<string, unknown>) => unknown,
+): void {
+  let buffer = "";
+  child.stdin.on("data", (chunk) => {
+    buffer += chunk.toString();
+    for (;;) {
+      const newlineIndex = buffer.indexOf("\n");
+      if (newlineIndex === -1) break;
+      const line = buffer.slice(0, newlineIndex);
+      buffer = buffer.slice(newlineIndex + 1);
+      const command = JSON.parse(line) as Record<string, unknown>;
+      const result = handler(command);
+      child.stdout.write(
+        `${JSON.stringify({
+          id: command.id,
+          type: "response",
+          command: command.type,
+          success: true,
+          data: result,
+        })}\n`,
+      );
+    }
+  });
+}
+
+describe("PiCliRuntime", () => {
+  test("starts pi in rpc mode and resolves command responses", async () => {
+    const child = createPiChild();
+    replyToCommands(child, (command) =>
+      command.type === "get_state"
+        ? {
+            sessionId: "pi-session-1",
+            thinkingLevel: "medium",
+            isStreaming: false,
+            isCompacting: false,
+            messageCount: 0,
+            pendingMessageCount: 0,
+          }
+        : {},
+    );
+    const launches: PiRuntimeLaunch[] = [];
+    const runtime = createRuntime(child, launches);
+
+    const session = await runtime.startSession({ cwd: "/workspace/project" });
+
+    await expect(session.getState()).resolves.toMatchObject({
+      sessionId: "pi-session-1",
+      thinkingLevel: "medium",
+    });
+    expect(launches).toEqual([
+      expect.objectContaining({
+        cwd: "/workspace/project",
+        argv: ["pi", "--mode", "rpc"],
+      }),
+    ]);
+  });
+
+  test("passes an MCP config path to Pi", async () => {
+    const child = createPiChild();
+    replyToCommands(child, () => ({}));
+    const launches: PiRuntimeLaunch[] = [];
+    const runtime = createRuntime(child, launches);
+
+    await runtime.startSession({
+      cwd: "/workspace/project",
+      mcpConfigPath: "/tmp/paseo-pi-mcp/mcp.json",
+    });
+
+    expect(launches).toEqual([
+      expect.objectContaining({
+        cwd: "/workspace/project",
+        mcpConfigPath: "/tmp/paseo-pi-mcp/mcp.json",
+        argv: ["pi", "--mode", "rpc", "--mcp-config", "/tmp/paseo-pi-mcp/mcp.json"],
+      }),
+    ]);
+  });
+
+  test("passes an appended system prompt to Pi", async () => {
+    const child = createPiChild();
+    replyToCommands(child, () => ({}));
+    const launches: PiRuntimeLaunch[] = [];
+    const runtime = createRuntime(child, launches);
+
+    await runtime.startSession({
+      cwd: "/workspace/project",
+      systemPrompt: "  Use the daemon prompt.  ",
+    });
+
+    expect(launches).toEqual([
+      expect.objectContaining({
+        cwd: "/workspace/project",
+        systemPrompt: "Use the daemon prompt.",
+        argv: ["pi", "--mode", "rpc", "--append-system-prompt", "Use the daemon prompt."],
+      }),
+    ]);
+  });
+
+  test("delivers events separately from command responses", async () => {
+    const child = createPiChild();
+    replyToCommands(child, () => ({ models: [] }));
+    const session = await createRuntime(child).startSession({ cwd: "/workspace/project" });
+    const events: unknown[] = [];
+    session.onEvent((event) => events.push(event));
+
+    child.stdout.write(`${JSON.stringify({ type: "turn_start" })}\n`);
+    await session.getAvailableModels();
+
+    expect(events).toEqual([{ type: "turn_start" }]);
+  });
+
+  test("keeps unicode line separators inside one JSONL record", async () => {
+    const child = createPiChild();
+    replyToCommands(child, () => ({}));
+    const session = await createRuntime(child).startSession({ cwd: "/workspace/project" });
+    const events: unknown[] = [];
+    session.onEvent((event) => events.push(event));
+
+    child.stdout.write(`${JSON.stringify({ type: "message", text: "a\u2028b\u2029c" })}\n`);
+
+    expect(events).toEqual([{ type: "message", text: "a\u2028b\u2029c" }]);
+  });
+
+  test("rejects pending commands when the Pi process exits", async () => {
+    const child = createPiChild();
+    const session = await createRuntime(child).startSession({ cwd: "/workspace/project" });
+
+    const state = session.getState();
+    child.stderr.write("boom");
+    child.emit("exit", 1, null);
+
+    await expect(state).rejects.toThrow("boom");
+  });
+
+  test("disposes the Pi process", async () => {
+    const child = createPiChild();
+    const session = await createRuntime(child).startSession({ cwd: "/workspace/project" });
+
+    await session.close();
+
+    expect(child.killedSignals).toContain("SIGTERM");
+  });
+});
diff --git a/packages/server/src/server/agent/providers/pi/cli-runtime.ts b/packages/server/src/server/agent/providers/pi/cli-runtime.ts
new file mode 100644
index 000000000..27ecbd803
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/cli-runtime.ts
@@ -0,0 +1,282 @@
+import { spawn, type ChildProcessWithoutNullStreams } from "node:child_process";
+import type { Logger } from "pino";
+
+import { terminateWithTreeKill } from "../../../../utils/tree-kill.js";
+import type { ProviderRuntimeSettings } from "../../provider-launch-config.js";
+import {
+  buildPiLaunch,
+  type PiRuntime,
+  type PiRuntimeLaunch,
+  type PiRuntimeSession,
+  type PiStartSessionInput,
+} from "./runtime.js";
+import type {
+  PiAgentMessage,
+  PiModel,
+  PiRpcCommand,
+  PiRpcResponse,
+  PiRpcSlashCommand,
+  PiRuntimeEvent,
+  PiSessionState,
+  PiSessionStats,
+} from "./rpc-types.js";
+
+const DEFAULT_PI_COMMAND: [string, ...string[]] = [
+  process.env.PI_COMMAND ?? process.env.PI_ACP_PI_COMMAND ?? "pi",
+];
+const DEFAULT_TIMEOUT_MS = 30_000;
+const STDERR_BUFFER_LIMIT = 8192;
+const GRACEFUL_SHUTDOWN_TIMEOUT_MS = 2_000;
+const FORCE_SHUTDOWN_TIMEOUT_MS = 1_000;
+
+interface PendingRequest {
+  resolve: (value: unknown) => void;
+  reject: (error: Error) => void;
+  timer: NodeJS.Timeout;
+}
+
+export interface PiCliRuntimeOptions {
+  logger: Logger;
+  runtimeSettings?: ProviderRuntimeSettings;
+  command?: [string, ...string[]];
+  spawnProcess?: (launch: PiRuntimeLaunch) => ChildProcessWithoutNullStreams;
+}
+
+export class PiCliRuntime implements PiRuntime {
+  private readonly command: [string, ...string[]];
+  private readonly spawnProcess: (launch: PiRuntimeLaunch) => ChildProcessWithoutNullStreams;
+
+  constructor(private readonly options: PiCliRuntimeOptions) {
+    this.command = options.command ?? DEFAULT_PI_COMMAND;
+    this.spawnProcess =
+      options.spawnProcess ??
+      ((launch) => {
+        const [command, ...args] = launch.argv;
+        return spawn(command, args, {
+          cwd: launch.cwd,
+          env: launch.env ? { ...process.env, ...launch.env } : process.env,
+          stdio: ["pipe", "pipe", "pipe"],
+        });
+      });
+  }
+
+  async startSession(input: PiStartSessionInput): Promise<PiRuntimeSession> {
+    const launch = buildPiLaunch({
+      command: this.command,
+      runtimeSettings: this.options.runtimeSettings,
+      session: input,
+    });
+    return new PiCliRuntimeSession(launch, this.spawnProcess(launch), this.options.logger);
+  }
+}
+
+class PiCliRuntimeSession implements PiRuntimeSession {
+  private readonly pending = new Map<string, PendingRequest>();
+  private readonly subscribers = new Set<(event: PiRuntimeEvent) => void>();
+  private stderrBuffer = "";
+  private nextRequestId = 1;
+  private disposed = false;
+  private stdoutBuffer = "";
+
+  constructor(
+    _launch: PiRuntimeLaunch,
+    private readonly child: ChildProcessWithoutNullStreams,
+    private readonly logger: Logger,
+  ) {
+    child.stdout.on("data", (chunk) => {
+      this.handleStdoutChunk(chunk.toString());
+    });
+    child.stderr.on("data", (chunk) => {
+      this.stderrBuffer += chunk.toString();
+      if (this.stderrBuffer.length > STDERR_BUFFER_LIMIT) {
+        this.stderrBuffer = this.stderrBuffer.slice(-STDERR_BUFFER_LIMIT);
+      }
+    });
+    child.on("error", (error) => {
+      this.failAll(error instanceof Error ? error : new Error(String(error)));
+    });
+    child.on("exit", (code, signal) => {
+      const error = new Error(
+        `Pi RPC process exited with code ${code ?? "null"} and signal ${signal ?? "null"}\n${this.stderrBuffer}`.trim(),
+      );
+      this.emit({ type: "process_exit", error: error.message });
+      this.failAll(error);
+    });
+  }
+
+  onEvent(callback: (event: PiRuntimeEvent) => void): () => void {
+    this.subscribers.add(callback);
+    return () => {
+      this.subscribers.delete(callback);
+    };
+  }
+
+  async prompt(
+    message: string,
+    images?: Array<{ type: "image"; data: string; mimeType: string }>,
+  ): Promise<void> {
+    await this.request({ type: "prompt", message, ...(images?.length ? { images } : {}) });
+  }
+
+  async abort(): Promise<void> {
+    await this.request({ type: "abort" });
+  }
+
+  async getState(): Promise<PiSessionState> {
+    return (await this.request({ type: "get_state" })) as PiSessionState;
+  }
+
+  async getMessages(): Promise<PiAgentMessage[]> {
+    const data = (await this.request({ type: "get_messages" })) as { messages?: PiAgentMessage[] };
+    return data.messages ?? [];
+  }
+
+  async getAvailableModels(): Promise<PiModel[]> {
+    const data = (await this.request({ type: "get_available_models" })) as { models?: PiModel[] };
+    return data.models ?? [];
+  }
+
+  async setModel(provider: string, modelId: string): Promise<PiModel> {
+    return (await this.request({ type: "set_model", provider, modelId })) as PiModel;
+  }
+
+  async setThinkingLevel(level: string): Promise<void> {
+    await this.request({ type: "set_thinking_level", level: level as never });
+  }
+
+  async getSessionStats(): Promise<PiSessionStats> {
+    return (await this.request({ type: "get_session_stats" })) as PiSessionStats;
+  }
+
+  async getCommands(): Promise<PiRpcSlashCommand[]> {
+    const data = (await this.request({ type: "get_commands" })) as {
+      commands?: PiRpcSlashCommand[];
+    };
+    return data.commands ?? [];
+  }
+
+  cancelExtensionUiRequest(id: string): void {
+    this.writeJsonLine({ type: "extension_ui_response", id, cancelled: true });
+  }
+
+  async close(): Promise<void> {
+    if (this.disposed) return;
+    this.disposed = true;
+    try {
+      this.child.stdin.end();
+    } catch {
+      // ignore
+    }
+    const result = await terminateWithTreeKill(this.child, {
+      gracefulTimeoutMs: GRACEFUL_SHUTDOWN_TIMEOUT_MS,
+      forceTimeoutMs: FORCE_SHUTDOWN_TIMEOUT_MS,
+      onForceSignal: () => {
+        this.logger.warn(
+          { timeoutMs: GRACEFUL_SHUTDOWN_TIMEOUT_MS },
+          "Pi RPC process did not exit after SIGTERM; sending SIGKILL",
+        );
+      },
+    });
+    if (result === "kill-timeout") {
+      this.logger.warn(
+        { timeoutMs: FORCE_SHUTDOWN_TIMEOUT_MS },
+        "Pi RPC process did not report exit after SIGKILL",
+      );
+    }
+  }
+
+  private request(command: PiRpcCommand, timeoutMs = DEFAULT_TIMEOUT_MS): Promise<unknown> {
+    if (this.disposed) {
+      return Promise.reject(new Error("Pi RPC session is closed"));
+    }
+    const id = `req_${this.nextRequestId}`;
+    this.nextRequestId += 1;
+    return new Promise((resolve, reject) => {
+      const timer = setTimeout(() => {
+        this.pending.delete(id);
+        reject(
+          new Error(`Pi RPC request timed out for ${command.type}\n${this.stderrBuffer}`.trim()),
+        );
+      }, timeoutMs);
+      this.pending.set(id, { resolve, reject, timer });
+      this.writeJsonLine({ ...command, id });
+    });
+  }
+
+  private writeJsonLine(value: unknown): void {
+    if (this.disposed || this.child.stdin.destroyed || !this.child.stdin.writable) {
+      return;
+    }
+    this.child.stdin.write(`${JSON.stringify(value)}\n`);
+  }
+
+  private handleStdoutChunk(chunk: string): void {
+    this.stdoutBuffer += chunk;
+    for (;;) {
+      const newlineIndex = this.stdoutBuffer.indexOf("\n");
+      if (newlineIndex === -1) {
+        break;
+      }
+      const line = this.stdoutBuffer.slice(0, newlineIndex).replace(/\r$/, "");
+      this.stdoutBuffer = this.stdoutBuffer.slice(newlineIndex + 1);
+      if (line.trim()) {
+        this.handleLine(line);
+      }
+    }
+  }
+
+  private handleLine(line: string): void {
+    let parsed: unknown;
+    try {
+      parsed = JSON.parse(line);
+    } catch (error) {
+      this.logger.warn({ error, line }, "Ignoring non-JSON Pi RPC stdout line");
+      return;
+    }
+    if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) {
+      return;
+    }
+    const message = parsed as Record<string, unknown>;
+    if (message.type === "response") {
+      this.handleResponse(message as unknown as PiRpcResponse);
+      return;
+    }
+    this.emit(message as PiRuntimeEvent);
+  }
+
+  private handleResponse(response: PiRpcResponse): void {
+    const id = response.id;
+    if (!id) {
+      return;
+    }
+    const pending = this.pending.get(id);
+    if (!pending) {
+      return;
+    }
+    clearTimeout(pending.timer);
+    this.pending.delete(id);
+    if (!response.success) {
+      pending.reject(new Error(response.error ?? `Pi RPC ${response.command} failed`));
+      return;
+    }
+    pending.resolve(response.data);
+  }
+
+  private emit(event: PiRuntimeEvent): void {
+    for (const subscriber of this.subscribers) {
+      subscriber(event);
+    }
+  }
+
+  private failAll(error: Error): void {
+    if (this.disposed) {
+      return;
+    }
+    this.disposed = true;
+    for (const pending of this.pending.values()) {
+      clearTimeout(pending.timer);
+      pending.reject(error);
+    }
+    this.pending.clear();
+  }
+}
diff --git a/packages/server/src/server/agent/providers/pi/history-mapper.test.ts b/packages/server/src/server/agent/providers/pi/history-mapper.test.ts
new file mode 100644
index 000000000..1851204b7
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/history-mapper.test.ts
@@ -0,0 +1,127 @@
+import { describe, expect, test } from "vitest";
+
+import type { AgentStreamEvent } from "../../agent-sdk-types.js";
+import type { PiAgentMessage } from "./rpc-types.js";
+import { streamPiHistory } from "./history-mapper.js";
+
+async function collectHistory(messages: PiAgentMessage[]): Promise<AgentStreamEvent[]> {
+  const events: AgentStreamEvent[] = [];
+  for await (const event of streamPiHistory("pi", messages)) {
+    events.push(event);
+  }
+  return events;
+}
+
+describe("Pi history mapper", () => {
+  test("replays user, assistant, reasoning, and completed tool calls", async () => {
+    await expect(
+      collectHistory([
+        {
+          role: "user",
+          content: [
+            { type: "text", text: "read this" },
+            { type: "image", data: "base64", mimeType: "image/png" },
+            { type: "text", text: "then answer" },
+          ],
+        },
+        {
+          role: "assistant",
+          content: [
+            { type: "thinking", thinking: "checking file" },
+            { type: "toolCall", id: "tool-1", name: "read", arguments: { path: "note.txt" } },
+            { type: "text", text: "done" },
+          ],
+        },
+        {
+          role: "toolResult",
+          toolCallId: "tool-1",
+          toolName: "read",
+          content: [{ type: "text", text: "file contents" }],
+        },
+      ]),
+    ).resolves.toEqual([
+      {
+        type: "timeline",
+        provider: "pi",
+        item: {
+          type: "user_message",
+          text: "read this\n\nthen answer",
+          messageId: "pi-user-0",
+        },
+      },
+      {
+        type: "timeline",
+        provider: "pi",
+        item: { type: "reasoning", text: "checking file" },
+      },
+      {
+        type: "timeline",
+        provider: "pi",
+        item: {
+          type: "tool_call",
+          callId: "tool-1",
+          name: "read",
+          status: "running",
+          detail: {
+            type: "read",
+            filePath: "note.txt",
+            content: undefined,
+            offset: undefined,
+            limit: undefined,
+          },
+          error: null,
+        },
+      },
+      {
+        type: "timeline",
+        provider: "pi",
+        item: { type: "assistant_message", text: "done" },
+      },
+      {
+        type: "timeline",
+        provider: "pi",
+        item: {
+          type: "tool_call",
+          callId: "tool-1",
+          name: "read",
+          status: "completed",
+          detail: {
+            type: "read",
+            filePath: "note.txt",
+            content: "file contents",
+            offset: undefined,
+            limit: undefined,
+          },
+          error: null,
+        },
+      },
+    ]);
+  });
+
+  test("replays bash execution records as completed shell calls", async () => {
+    await expect(
+      collectHistory([
+        {
+          role: "bashExecution",
+          command: "echo hi",
+          output: "hi\n",
+          exitCode: 0,
+          timestamp: 123,
+        },
+      ]),
+    ).resolves.toEqual([
+      {
+        type: "timeline",
+        provider: "pi",
+        item: {
+          type: "tool_call",
+          callId: "pi-bash-123",
+          name: "bash",
+          status: "completed",
+          detail: { type: "shell", command: "echo hi", output: "hi\n", exitCode: 0 },
+          error: null,
+        },
+      },
+    ]);
+  });
+});
diff --git a/packages/server/src/server/agent/providers/pi/history-mapper.ts b/packages/server/src/server/agent/providers/pi/history-mapper.ts
new file mode 100644
index 000000000..f8440f901
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/history-mapper.ts
@@ -0,0 +1,169 @@
+import type { AgentStreamEvent, AgentTimelineItem, ToolCallDetail } from "../../agent-sdk-types.js";
+import type { PiAgentMessage, PiImageContent, PiTextContent } from "./rpc-types.js";
+import {
+  extractTextFromToolResult,
+  mapToolDetail,
+  parseToolArgs,
+  parseToolResult,
+  type PiTrackedToolCall,
+} from "./tool-call-mapper.js";
+
+function isTextContentBlock(block: unknown): block is PiTextContent {
+  return (
+    typeof block === "object" &&
+    block !== null &&
+    !Array.isArray(block) &&
+    Reflect.get(block, "type") === "text" &&
+    typeof Reflect.get(block, "text") === "string"
+  );
+}
+
+export function getUserMessageText(content: string | (PiTextContent | PiImageContent)[]): string {
+  if (typeof content === "string") {
+    return content;
+  }
+
+  const textParts: string[] = [];
+  for (const block of content) {
+    if (isTextContentBlock(block)) {
+      textParts.push(block.text);
+    }
+  }
+  return textParts.join("\n\n");
+}
+
+export async function* streamPiHistory(
+  provider: string,
+  messages: PiAgentMessage[],
+): AsyncGenerator<AgentStreamEvent> {
+  const pendingToolCalls = new Map<string, PiTrackedToolCall>();
+  let userIndex = 0;
+
+  for (const message of messages) {
+    if (message.role === "user") {
+      const text = getUserMessageText(message.content);
+      if (text) {
+        yield {
+          type: "timeline",
+          provider,
+          item: {
+            type: "user_message",
+            text,
+            messageId: `pi-user-${userIndex}`,
+          },
+        };
+      }
+      userIndex += 1;
+      continue;
+    }
+
+    if (message.role === "assistant") {
+      for (const content of message.content) {
+        if (content.type === "text" && content.text) {
+          yield {
+            type: "timeline",
+            provider,
+            item: { type: "assistant_message", text: content.text },
+          };
+          continue;
+        }
+
+        if (content.type === "thinking" && content.thinking) {
+          yield {
+            type: "timeline",
+            provider,
+            item: { type: "reasoning", text: content.thinking },
+          };
+          continue;
+        }
+
+        if (content.type === "toolCall") {
+          const tracked = parseToolArgs(content.name, content.arguments);
+          pendingToolCalls.set(content.id, tracked);
+          yield {
+            type: "timeline",
+            provider,
+            item: {
+              type: "tool_call",
+              callId: content.id,
+              name: tracked.toolName,
+              status: "running",
+              detail: mapToolDetail(tracked, null),
+              error: null,
+            },
+          };
+        }
+      }
+      continue;
+    }
+
+    if (message.role === "toolResult") {
+      const tracked =
+        pendingToolCalls.get(message.toolCallId) ?? parseToolArgs(message.toolName, null);
+      pendingToolCalls.delete(message.toolCallId);
+      const result = parseToolResult({ content: message.content });
+      const detail = mapToolDetail(tracked, result);
+      yield {
+        type: "timeline",
+        provider,
+        item: toToolResultTimelineItem({
+          callId: message.toolCallId,
+          name: tracked.toolName,
+          isError: Boolean(message.isError),
+          detail,
+          errorText: extractTextFromToolResult(result) ?? "Tool call failed",
+        }),
+      };
+      continue;
+    }
+
+    if (message.role === "bashExecution") {
+      const callId = `pi-bash-${message.timestamp}`;
+      const detail: ToolCallDetail = {
+        type: "shell",
+        command: message.command,
+        output: message.output,
+        exitCode: message.exitCode ?? null,
+      };
+      yield {
+        type: "timeline",
+        provider,
+        item: {
+          type: "tool_call",
+          callId,
+          name: "bash",
+          status: message.cancelled ? "canceled" : "completed",
+          detail,
+          error: null,
+        },
+      };
+    }
+  }
+}
+
+function toToolResultTimelineItem(input: {
+  callId: string;
+  name: string;
+  isError: boolean;
+  detail: ToolCallDetail;
+  errorText: string;
+}): AgentTimelineItem {
+  if (input.isError) {
+    return {
+      type: "tool_call",
+      callId: input.callId,
+      name: input.name,
+      status: "failed",
+      detail: input.detail,
+      error: input.errorText,
+    };
+  }
+  return {
+    type: "tool_call",
+    callId: input.callId,
+    name: input.name,
+    status: "completed",
+    detail: input.detail,
+    error: null,
+  };
+}
diff --git a/packages/server/src/server/agent/providers/pi/rpc-types.ts b/packages/server/src/server/agent/providers/pi/rpc-types.ts
new file mode 100644
index 000000000..93efad32b
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/rpc-types.ts
@@ -0,0 +1,172 @@
+export type PiThinkingLevel = "off" | "minimal" | "low" | "medium" | "high" | "xhigh";
+
+export interface PiImageContent {
+  type: "image";
+  data: string;
+  mimeType: string;
+}
+
+export interface PiTextContent {
+  type: "text";
+  text: string;
+}
+
+export interface PiThinkingContent {
+  type: "thinking";
+  thinking: string;
+}
+
+export interface PiToolCallContent {
+  type: "toolCall";
+  id: string;
+  name: string;
+  arguments: unknown;
+}
+
+export type PiAssistantContent = PiTextContent | PiThinkingContent | PiToolCallContent;
+
+export type PiAgentMessage =
+  | {
+      role: "user";
+      content: string | Array<PiTextContent | PiImageContent>;
+    }
+  | {
+      role: "assistant";
+      content: PiAssistantContent[];
+      errorMessage?: string | null;
+      stopReason?: string;
+    }
+  | {
+      role: "toolResult";
+      toolCallId: string;
+      toolName: string;
+      content: unknown;
+      isError?: boolean;
+    }
+  | {
+      role: "bashExecution";
+      command: string;
+      output?: string;
+      exitCode?: number | null;
+      cancelled?: boolean;
+      timestamp: number;
+    };
+
+export interface PiModel {
+  provider: string;
+  id: string;
+  name?: string;
+  reasoning?: boolean;
+  contextWindow?: number;
+  maxTokens?: number;
+  api?: string;
+  baseUrl?: string;
+  input?: string[];
+  cost?: Record<string, unknown>;
+  compat?: unknown;
+}
+
+export interface PiSessionState {
+  model?: PiModel | null;
+  thinkingLevel: PiThinkingLevel;
+  isStreaming: boolean;
+  isCompacting: boolean;
+  sessionFile?: string;
+  sessionId: string;
+  sessionName?: string;
+  messageCount: number;
+  pendingMessageCount: number;
+}
+
+export interface PiSessionStats {
+  tokens?: {
+    input?: number;
+    output?: number;
+    cacheRead?: number;
+    cacheWrite?: number;
+    total?: number;
+  };
+  cost?: number;
+  contextUsage?: {
+    tokens?: number | null;
+    contextWindow?: number | null;
+    percent?: number | null;
+  };
+}
+
+export interface PiRpcSlashCommand {
+  name: string;
+  description?: string;
+  source: "extension" | "prompt" | "skill";
+  sourceInfo?: Record<string, unknown>;
+}
+
+export type PiRpcCommand =
+  | { id?: string; type: "prompt"; message: string; images?: PiImageContent[] }
+  | { id?: string; type: "abort" }
+  | { id?: string; type: "get_state" }
+  | { id?: string; type: "get_messages" }
+  | { id?: string; type: "get_available_models" }
+  | { id?: string; type: "set_model"; provider: string; modelId: string }
+  | { id?: string; type: "set_thinking_level"; level: PiThinkingLevel }
+  | { id?: string; type: "get_session_stats" }
+  | { id?: string; type: "get_commands" };
+
+export interface PiRpcResponse {
+  id?: string;
+  type: "response";
+  command: string;
+  success: boolean;
+  data?: unknown;
+  error?: string;
+}
+
+export type PiAssistantMessageEvent =
+  | { type: "text_delta"; delta?: string }
+  | { type: "thinking_delta"; delta?: string }
+  | { type: "start" | "text_start" | "text_end" | "thinking_start" | "thinking_end" | "done" };
+
+export type PiAgentSessionEvent =
+  | { type: "agent_start" }
+  | { type: "turn_start" }
+  | {
+      type: "message_update";
+      message: PiAgentMessage;
+      assistantMessageEvent: PiAssistantMessageEvent;
+    }
+  | {
+      type: "tool_execution_start";
+      toolCallId: string;
+      toolName: string;
+      args: unknown;
+    }
+  | {
+      type: "tool_execution_update";
+      toolCallId: string;
+      toolName: string;
+      args?: unknown;
+      partialResult: unknown;
+    }
+  | {
+      type: "tool_execution_end";
+      toolCallId: string;
+      toolName: string;
+      result: unknown;
+      isError?: boolean;
+    }
+  | { type: "compaction_start"; reason?: "manual" | "threshold" | "overflow" | string }
+  | { type: "compaction_end"; reason?: string; errorMessage?: string; aborted?: boolean }
+  | { type: "agent_end"; messages?: PiAgentMessage[] };
+
+export type PiRuntimeEvent =
+  | PiAgentSessionEvent
+  | {
+      type: "extension_ui_request";
+      id: string;
+      method: string;
+      [key: string]: unknown;
+    }
+  | {
+      type: "process_exit";
+      error: string;
+    };
diff --git a/packages/server/src/server/agent/providers/pi/runtime.ts b/packages/server/src/server/agent/providers/pi/runtime.ts
new file mode 100644
index 000000000..0e7a50b5e
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/runtime.ts
@@ -0,0 +1,106 @@
+import type {
+  PiAgentMessage,
+  PiModel,
+  PiRpcSlashCommand,
+  PiRuntimeEvent,
+  PiSessionState,
+  PiSessionStats,
+} from "./rpc-types.js";
+import type { ProviderRuntimeSettings } from "../../provider-launch-config.js";
+
+export interface PiRuntimeLaunch {
+  cwd: string;
+  argv: string[];
+  env?: Record<string, string>;
+  model?: string;
+  thinkingOptionId?: string;
+  session?: string;
+  systemPrompt?: string;
+  mcpConfigPath?: string;
+}
+
+export interface PiStartSessionInput {
+  cwd: string;
+  model?: string;
+  thinkingOptionId?: string;
+  session?: string;
+  systemPrompt?: string;
+  mcpConfigPath?: string;
+}
+
+export interface PiRuntimeSession {
+  onEvent(callback: (event: PiRuntimeEvent) => void): () => void;
+  prompt(
+    message: string,
+    images?: Array<{ type: "image"; data: string; mimeType: string }>,
+  ): Promise<void>;
+  abort(): Promise<void>;
+  getState(): Promise<PiSessionState>;
+  getMessages(): Promise<PiAgentMessage[]>;
+  getAvailableModels(): Promise<PiModel[]>;
+  setModel(provider: string, modelId: string): Promise<PiModel>;
+  setThinkingLevel(level: string): Promise<void>;
+  getSessionStats(): Promise<PiSessionStats>;
+  getCommands(): Promise<PiRpcSlashCommand[]>;
+  cancelExtensionUiRequest(id: string): void;
+  close(): Promise<void>;
+}
+
+export interface PiRuntime {
+  startSession(input: PiStartSessionInput): Promise<PiRuntimeSession>;
+}
+
+export function buildPiLaunch(input: {
+  command: [string, ...string[]];
+  runtimeSettings?: ProviderRuntimeSettings;
+  session: PiStartSessionInput;
+}): PiRuntimeLaunch {
+  const command =
+    input.runtimeSettings?.command?.mode === "replace" && input.runtimeSettings.command.argv[0]
+      ? input.runtimeSettings.command.argv
+      : input.command;
+  const argv = [...command];
+
+  if (!hasModeRpc(argv)) {
+    argv.push("--mode", "rpc");
+  }
+  if (input.session.model) {
+    argv.push("--model", input.session.model);
+  }
+  if (input.session.thinkingOptionId) {
+    argv.push("--thinking", input.session.thinkingOptionId);
+  }
+  if (input.session.session) {
+    argv.push("--session", input.session.session);
+  }
+  const systemPrompt = input.session.systemPrompt?.trim();
+  if (systemPrompt) {
+    argv.push("--append-system-prompt", systemPrompt);
+  }
+  if (input.session.mcpConfigPath) {
+    argv.push("--mcp-config", input.session.mcpConfigPath);
+  }
+
+  return {
+    cwd: input.session.cwd,
+    argv,
+    env: input.runtimeSettings?.env,
+    model: input.session.model,
+    thinkingOptionId: input.session.thinkingOptionId,
+    session: input.session.session,
+    systemPrompt,
+    mcpConfigPath: input.session.mcpConfigPath,
+  };
+}
+
+function hasModeRpc(argv: string[]): boolean {
+  for (let i = 0; i < argv.length; i += 1) {
+    if (argv[i] === "--mode" && argv[i + 1] === "rpc") {
+      return true;
+    }
+    if (argv[i] === "--mode=rpc") {
+      return true;
+    }
+  }
+  return false;
+}
diff --git a/packages/server/src/server/agent/providers/pi/session-descriptor.test.ts b/packages/server/src/server/agent/providers/pi/session-descriptor.test.ts
new file mode 100644
index 000000000..9665fe8be
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/session-descriptor.test.ts
@@ -0,0 +1,297 @@
+import { mkdirSync, mkdtempSync, realpathSync, symlinkSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { describe, expect, test } from "vitest";
+
+import { listPiPersistedAgents } from "./session-descriptor.js";
+
+const directorySymlinkType = process.platform === "win32" ? "junction" : "dir";
+
+function tempRoot(): string {
+  return mkdtempSync(path.join(tmpdir(), "paseo-pi-sessions-"));
+}
+
+function writeJsonl(filePath: string, entries: unknown[]): string {
+  mkdirSync(path.dirname(filePath), { recursive: true });
+  writeFileSync(filePath, `${entries.map((entry) => JSON.stringify(entry)).join("\n")}\n`, "utf8");
+  return filePath;
+}
+
+function piSession(overrides: {
+  id: string;
+  cwd: string;
+  timestamp?: string;
+  entries?: unknown[];
+}): unknown[] {
+  return [
+    {
+      type: "session",
+      version: 3,
+      id: overrides.id,
+      timestamp: overrides.timestamp ?? "2026-01-01T00:00:00.000Z",
+      cwd: overrides.cwd,
+    },
+    ...(overrides.entries ?? []),
+  ];
+}
+
+function message(input: {
+  role: "user" | "assistant";
+  content: unknown;
+  timestamp: string;
+}): unknown {
+  return {
+    type: "message",
+    id: `entry-${input.timestamp}`,
+    parentId: null,
+    timestamp: input.timestamp,
+    message: {
+      role: input.role,
+      content: input.content,
+    },
+  };
+}
+
+function sessionInfo(name: string, timestamp: string): unknown {
+  return {
+    type: "session_info",
+    id: `info-${timestamp}`,
+    parentId: null,
+    timestamp,
+    name,
+  };
+}
+
+describe("listPiPersistedAgents", () => {
+  test("lists Pi sessions from the configured agent dir", async () => {
+    const root = tempRoot();
+    const cwd = path.join(root, "project");
+    const sessionsDir = path.join(root, "agent", "sessions", "--project--");
+    const sessionFile = writeJsonl(
+      path.join(sessionsDir, "20260101_session-a.jsonl"),
+      piSession({
+        id: "session-a",
+        cwd,
+        entries: [
+          message({
+            role: "user",
+            content: "first prompt",
+            timestamp: "2026-01-01T00:00:01.000Z",
+          }),
+          message({
+            role: "assistant",
+            content: [{ type: "text", text: "answer" }],
+            timestamp: "2026-01-01T00:00:02.000Z",
+          }),
+          message({
+            role: "user",
+            content: [{ type: "text", text: "last prompt" }],
+            timestamp: "2026-01-01T00:00:03.000Z",
+          }),
+          sessionInfo("Named Pi Session", "2026-01-01T00:00:10.000Z"),
+        ],
+      }),
+    );
+
+    const descriptors = await listPiPersistedAgents({
+      cwd,
+      env: { PI_CODING_AGENT_DIR: path.join(root, "agent") },
+      homeDir: root,
+    });
+
+    expect(descriptors).toEqual([
+      {
+        provider: "pi",
+        sessionId: "session-a",
+        cwd,
+        title: "Named Pi Session",
+        lastActivityAt: new Date("2026-01-01T00:00:03.000Z"),
+        persistence: {
+          provider: "pi",
+          sessionId: "session-a",
+          nativeHandle: sessionFile,
+          metadata: {
+            provider: "pi",
+            cwd,
+          },
+        },
+        timeline: [
+          { type: "user_message", text: "first prompt" },
+          { type: "user_message", text: "last prompt" },
+        ],
+      },
+    ]);
+  });
+
+  test("uses the runtime session-dir override before Pi settings", async () => {
+    const root = tempRoot();
+    const cwd = path.join(root, "project");
+    const agentDir = path.join(root, "agent");
+    const runtimeSessionsDir = path.join(root, "runtime-sessions");
+    const settingsSessionsDir = path.join(root, "settings-sessions");
+    mkdirSync(agentDir, { recursive: true });
+    writeFileSync(
+      path.join(agentDir, "settings.json"),
+      JSON.stringify({ sessionDir: settingsSessionsDir }),
+      "utf8",
+    );
+    writeJsonl(
+      path.join(settingsSessionsDir, "ignored.jsonl"),
+      piSession({ id: "settings-session", cwd }),
+    );
+    writeJsonl(
+      path.join(runtimeSessionsDir, "selected.jsonl"),
+      piSession({
+        id: "runtime-session",
+        cwd,
+        entries: [
+          message({
+            role: "user",
+            content: "from runtime dir",
+            timestamp: "2026-01-01T00:00:01.000Z",
+          }),
+        ],
+      }),
+    );
+
+    const descriptors = await listPiPersistedAgents({
+      cwd,
+      runtimeSettings: {
+        env: {
+          PI_CODING_AGENT_DIR: agentDir,
+          PI_CODING_AGENT_SESSION_DIR: runtimeSessionsDir,
+        },
+      },
+      env: {},
+      homeDir: root,
+    });
+
+    expect(descriptors.map((descriptor) => descriptor.sessionId)).toEqual(["runtime-session"]);
+  });
+
+  test("resolves project settings sessionDir relative to the requested cwd", async () => {
+    const root = tempRoot();
+    const cwd = path.join(root, "project");
+    const projectSettingsDir = path.join(cwd, ".pi");
+    const sessionsDir = path.join(cwd, "relative-sessions");
+    mkdirSync(projectSettingsDir, { recursive: true });
+    writeFileSync(
+      path.join(projectSettingsDir, "settings.json"),
+      JSON.stringify({ sessionDir: "relative-sessions" }),
+      "utf8",
+    );
+    writeJsonl(
+      path.join(sessionsDir, "relative.jsonl"),
+      piSession({
+        id: "relative-session",
+        cwd,
+        entries: [
+          message({
+            role: "user",
+            content: "relative settings",
+            timestamp: "2026-01-01T00:00:01.000Z",
+          }),
+        ],
+      }),
+    );
+
+    const descriptors = await listPiPersistedAgents({
+      cwd,
+      env: { PI_CODING_AGENT_DIR: path.join(root, "agent") },
+      homeDir: root,
+    });
+
+    expect(descriptors.map((descriptor) => descriptor.sessionId)).toEqual(["relative-session"]);
+  });
+
+  test("matches sessions stored with the real cwd when the requested cwd is symlinked", async () => {
+    const root = tempRoot();
+    const realCwd = path.join(root, "real-project");
+    const linkedCwd = path.join(root, "linked-project");
+    mkdirSync(realCwd, { recursive: true });
+    symlinkSync(realCwd, linkedCwd, directorySymlinkType);
+    const persistedCwd = realpathSync(linkedCwd);
+    const sessionsDir = path.join(root, "agent", "sessions");
+    writeJsonl(
+      path.join(sessionsDir, "symlinked.jsonl"),
+      piSession({
+        id: "symlinked-session",
+        cwd: persistedCwd,
+        entries: [
+          message({
+            role: "user",
+            content: "through symlink",
+            timestamp: "2026-01-01T00:00:01.000Z",
+          }),
+        ],
+      }),
+    );
+
+    const descriptors = await listPiPersistedAgents({
+      cwd: linkedCwd,
+      env: { PI_CODING_AGENT_DIR: path.join(root, "agent") },
+      homeDir: root,
+    });
+
+    expect(descriptors.map((descriptor) => descriptor.sessionId)).toEqual(["symlinked-session"]);
+  });
+
+  test("filters by cwd, sorts by activity, and ignores invalid session files", async () => {
+    const root = tempRoot();
+    const cwd = path.join(root, "project");
+    const otherCwd = path.join(root, "other");
+    const sessionsDir = path.join(root, "agent", "sessions");
+    writeJsonl(
+      path.join(sessionsDir, "older.jsonl"),
+      piSession({
+        id: "older",
+        cwd,
+        entries: [
+          message({
+            role: "user",
+            content: "older",
+            timestamp: "2026-01-01T00:00:01.000Z",
+          }),
+        ],
+      }),
+    );
+    writeJsonl(
+      path.join(sessionsDir, "newer.jsonl"),
+      piSession({
+        id: "newer",
+        cwd,
+        entries: [
+          message({
+            role: "user",
+            content: "newer",
+            timestamp: "2026-01-01T00:00:02.000Z",
+          }),
+        ],
+      }),
+    );
+    writeJsonl(
+      path.join(sessionsDir, "outside.jsonl"),
+      piSession({
+        id: "outside",
+        cwd: otherCwd,
+        entries: [
+          message({
+            role: "user",
+            content: "outside",
+            timestamp: "2026-01-01T00:00:03.000Z",
+          }),
+        ],
+      }),
+    );
+    writeFileSync(path.join(sessionsDir, "broken.jsonl"), '{"type":"nope"}\n', "utf8");
+
+    const descriptors = await listPiPersistedAgents({
+      cwd,
+      limit: 1,
+      env: { PI_CODING_AGENT_DIR: path.join(root, "agent") },
+      homeDir: root,
+    });
+
+    expect(descriptors.map((descriptor) => descriptor.sessionId)).toEqual(["newer"]);
+  });
+});
diff --git a/packages/server/src/server/agent/providers/pi/session-descriptor.ts b/packages/server/src/server/agent/providers/pi/session-descriptor.ts
new file mode 100644
index 000000000..b1e6d9918
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/session-descriptor.ts
@@ -0,0 +1,372 @@
+import { open, readdir, readFile, stat } from "node:fs/promises";
+import { homedir } from "node:os";
+import path from "node:path";
+
+import type {
+  AgentPersistenceHandle,
+  AgentTimelineItem,
+  ListPersistedAgentsOptions,
+  PersistedAgentDescriptor,
+} from "../../agent-sdk-types.js";
+import type { ProviderRuntimeSettings } from "../../provider-launch-config.js";
+import { createRealpathAwarePathMatcher } from "../../../../utils/path.js";
+
+const PI_PROVIDER = "pi";
+const PI_CONFIG_DIR_NAME = ".pi";
+const PI_AGENT_DIR_ENV = "PI_CODING_AGENT_DIR";
+const PI_SESSION_DIR_ENV = "PI_CODING_AGENT_SESSION_DIR";
+const HEAD_BYTES = 64 * 1024;
+const TAIL_BYTES = 256 * 1024;
+const FULL_SCAN_LINE_LIMIT = 2_000;
+
+interface PiSessionDescriptorOptions extends ListPersistedAgentsOptions {
+  runtimeSettings?: ProviderRuntimeSettings;
+  env?: NodeJS.ProcessEnv;
+  homeDir?: string;
+}
+
+interface PiSessionHeader {
+  sessionId: string;
+  cwd: string;
+  createdAt: Date | null;
+}
+
+interface PiSessionTail {
+  title: string | null;
+  lastActivityAt: Date | null;
+  lastUserMessage: string | null;
+}
+
+export async function listPiPersistedAgents(
+  options: PiSessionDescriptorOptions = {},
+): Promise<PersistedAgentDescriptor[]> {
+  const sessionsDir = await resolvePiSessionsDir(options);
+  const files = await walkJsonlFiles(sessionsDir);
+  const matchesCwd = options.cwd ? createRealpathAwarePathMatcher(options.cwd) : null;
+  const limit = options.limit ?? 20;
+  const descriptors: PersistedAgentDescriptor[] = [];
+
+  for (const file of files) {
+    const descriptor = await readPiSessionDescriptor(file);
+    if (!descriptor) continue;
+    if (matchesCwd && !matchesCwd(descriptor.cwd)) continue;
+    descriptors.push(descriptor);
+  }
+
+  return descriptors
+    .sort((left, right) => right.lastActivityAt.getTime() - left.lastActivityAt.getTime())
+    .slice(0, limit);
+}
+
+async function resolvePiSessionsDir(options: PiSessionDescriptorOptions): Promise<string> {
+  const env = options.env ?? process.env;
+  const homeDir = options.homeDir ?? homedir();
+  const baseDir = options.cwd ?? process.cwd();
+  const agentDir = resolvePiAgentDir({ runtimeSettings: options.runtimeSettings, env, homeDir });
+
+  const envSessionDir =
+    options.runtimeSettings?.env?.[PI_SESSION_DIR_ENV] ?? env[PI_SESSION_DIR_ENV];
+  if (envSessionDir?.trim()) {
+    return resolveConfigPath(envSessionDir, { baseDir, homeDir });
+  }
+
+  const settingsSessionDir = await readConfiguredSessionDir({
+    agentDir,
+    cwd: options.cwd,
+  });
+  if (settingsSessionDir?.trim()) {
+    return resolveConfigPath(settingsSessionDir, { baseDir, homeDir });
+  }
+
+  return path.join(agentDir, "sessions");
+}
+
+function resolvePiAgentDir(input: {
+  runtimeSettings?: ProviderRuntimeSettings;
+  env: NodeJS.ProcessEnv;
+  homeDir: string;
+}): string {
+  const configured = input.runtimeSettings?.env?.[PI_AGENT_DIR_ENV] ?? input.env[PI_AGENT_DIR_ENV];
+  if (configured?.trim()) {
+    return resolveConfigPath(configured, { baseDir: process.cwd(), homeDir: input.homeDir });
+  }
+  return path.join(input.homeDir, PI_CONFIG_DIR_NAME, "agent");
+}
+
+async function readConfiguredSessionDir(input: {
+  agentDir: string;
+  cwd: string | undefined;
+}): Promise<string | null> {
+  const values = await Promise.all([
+    readSessionDirFromSettings(path.join(input.agentDir, "settings.json")),
+    input.cwd
+      ? readSessionDirFromSettings(path.join(input.cwd, PI_CONFIG_DIR_NAME, "settings.json"))
+      : null,
+  ]);
+  return values[1] ?? values[0] ?? null;
+}
+
+async function readSessionDirFromSettings(settingsPath: string): Promise<string | null> {
+  try {
+    const parsed = JSON.parse(await readFile(settingsPath, "utf8")) as unknown;
+    if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) {
+      return null;
+    }
+    const sessionDir = Reflect.get(parsed, "sessionDir");
+    return typeof sessionDir === "string" && sessionDir.trim() ? sessionDir : null;
+  } catch {
+    return null;
+  }
+}
+
+function resolveConfigPath(value: string, options: { baseDir: string; homeDir: string }): string {
+  if (value === "~") {
+    return options.homeDir;
+  }
+  if (value.startsWith("~/")) {
+    return path.join(options.homeDir, value.slice(2));
+  }
+  return path.isAbsolute(value) ? value : path.resolve(options.baseDir, value);
+}
+
+async function walkJsonlFiles(root: string): Promise<string[]> {
+  let entries: import("node:fs").Dirent[];
+  try {
+    entries = await readdir(root, { withFileTypes: true });
+  } catch {
+    return [];
+  }
+
+  const files = await Promise.all(
+    entries.map(async (entry) => {
+      const entryPath = path.join(root, entry.name);
+      if (entry.isDirectory()) {
+        return await walkJsonlFiles(entryPath);
+      }
+      return entry.isFile() && entry.name.endsWith(".jsonl") ? [entryPath] : [];
+    }),
+  );
+  return files.flat();
+}
+
+async function readPiSessionDescriptor(filePath: string): Promise<PersistedAgentDescriptor | null> {
+  const firstLine = await readFirstLine(filePath);
+  if (!firstLine) return null;
+  const header = parseSessionHeader(firstLine);
+  if (!header) return null;
+
+  const tail = await readTail(filePath).catch(() => "");
+  const tailInfo = parseSessionTail(tail);
+  const headInfo = await scanSessionHead(filePath);
+  const title = tailInfo.title ?? headInfo.title ?? headInfo.firstUserMessage;
+  const lastActivityAt =
+    tailInfo.lastActivityAt ?? (await readFileMtime(filePath)) ?? header.createdAt ?? new Date(0);
+  const timeline = buildPreviewTimeline({
+    firstUserMessage: headInfo.firstUserMessage,
+    lastUserMessage: tailInfo.lastUserMessage,
+  });
+
+  const persistence: AgentPersistenceHandle = {
+    provider: PI_PROVIDER,
+    sessionId: header.sessionId,
+    nativeHandle: filePath,
+    metadata: {
+      provider: PI_PROVIDER,
+      cwd: header.cwd,
+    },
+  };
+
+  return {
+    provider: PI_PROVIDER,
+    sessionId: header.sessionId,
+    cwd: header.cwd,
+    title,
+    lastActivityAt,
+    persistence,
+    timeline,
+  };
+}
+
+async function readFirstLine(filePath: string): Promise<string | null> {
+  const handle = await open(filePath, "r").catch(() => null);
+  if (!handle) return null;
+  try {
+    const buffer = Buffer.alloc(HEAD_BYTES);
+    const { bytesRead } = await handle.read(buffer, 0, buffer.length, 0);
+    if (bytesRead <= 0) return null;
+    const chunk = buffer.subarray(0, bytesRead).toString("utf8");
+    const newlineIndex = chunk.indexOf("\n");
+    return (newlineIndex === -1 ? chunk : chunk.slice(0, newlineIndex)).trim();
+  } finally {
+    await handle.close().catch(() => undefined);
+  }
+}
+
+async function readTail(filePath: string): Promise<string> {
+  const fileStats = await stat(filePath);
+  const start = Math.max(0, fileStats.size - TAIL_BYTES);
+  const length = fileStats.size - start;
+  const handle = await open(filePath, "r");
+  try {
+    const buffer = Buffer.alloc(length);
+    const { bytesRead } = await handle.read(buffer, 0, buffer.length, start);
+    return buffer.subarray(0, bytesRead).toString("utf8");
+  } finally {
+    await handle.close().catch(() => undefined);
+  }
+}
+
+async function readFileMtime(filePath: string): Promise<Date | null> {
+  try {
+    return (await stat(filePath)).mtime;
+  } catch {
+    return null;
+  }
+}
+
+function parseSessionHeader(firstLine: string): PiSessionHeader | null {
+  const entry = parseJsonRecord(firstLine);
+  if (!entry || entry.type !== "session") return null;
+  const sessionId = typeof entry.id === "string" ? entry.id : null;
+  const cwd = typeof entry.cwd === "string" ? entry.cwd : null;
+  if (!sessionId || !cwd) return null;
+  const createdAt = parseDate(entry.timestamp);
+  return { sessionId, cwd, createdAt };
+}
+
+function parseSessionTail(tail: string): PiSessionTail {
+  const lines = tail.split(/\r?\n/);
+  let title: string | null = null;
+  let lastActivityAt: Date | null = null;
+  let fallbackTimestamp: Date | null = null;
+  let lastUserMessage: string | null = null;
+
+  for (let index = lines.length - 1; index >= 0; index -= 1) {
+    const entry = parseJsonRecord(lines[index].trim());
+    if (!entry) continue;
+
+    if (!title && entry.type === "session_info") {
+      title = readNonEmptyString(entry.name);
+    }
+
+    const entryTimestamp = parseDate(entry.timestamp);
+    if (!fallbackTimestamp && entryTimestamp) {
+      fallbackTimestamp = entryTimestamp;
+    }
+
+    if (entry.type !== "message") {
+      continue;
+    }
+
+    if (!lastActivityAt && entryTimestamp) {
+      lastActivityAt = entryTimestamp;
+    }
+
+    if (!lastUserMessage && isRecord(entry.message) && entry.message.role === "user") {
+      lastUserMessage = extractMessageText(entry.message.content);
+    }
+
+    if (title && lastActivityAt && lastUserMessage) {
+      break;
+    }
+  }
+
+  return { title, lastActivityAt: lastActivityAt ?? fallbackTimestamp, lastUserMessage };
+}
+
+async function scanSessionHead(filePath: string): Promise<{
+  title: string | null;
+  firstUserMessage: string | null;
+}> {
+  let content: string;
+  try {
+    content = await readFile(filePath, "utf8");
+  } catch {
+    return { title: null, firstUserMessage: null };
+  }
+
+  let title: string | null = null;
+  let firstUserMessage: string | null = null;
+  let lineCount = 0;
+
+  for (const rawLine of content.split(/\r?\n/)) {
+    lineCount += 1;
+    const entry = parseJsonRecord(rawLine.trim());
+    if (!entry) continue;
+
+    if (entry.type === "session_info") {
+      title = readNonEmptyString(entry.name) ?? title;
+    }
+
+    if (!firstUserMessage && entry.type === "message" && isRecord(entry.message)) {
+      if (entry.message.role === "user") {
+        firstUserMessage = extractMessageText(entry.message.content);
+      }
+    }
+
+    if (title && firstUserMessage) {
+      break;
+    }
+    if (lineCount >= FULL_SCAN_LINE_LIMIT && firstUserMessage) {
+      break;
+    }
+  }
+
+  return { title, firstUserMessage };
+}
+
+function buildPreviewTimeline(input: {
+  firstUserMessage: string | null;
+  lastUserMessage: string | null;
+}): AgentTimelineItem[] {
+  const items: AgentTimelineItem[] = [];
+  if (input.firstUserMessage) {
+    items.push({ type: "user_message", text: input.firstUserMessage });
+  }
+  if (input.lastUserMessage && input.lastUserMessage !== input.firstUserMessage) {
+    items.push({ type: "user_message", text: input.lastUserMessage });
+  }
+  return items;
+}
+
+function parseJsonRecord(line: string): Record<string, unknown> | null {
+  if (!line) return null;
+  try {
+    const parsed = JSON.parse(line) as unknown;
+    return isRecord(parsed) ? parsed : null;
+  } catch {
+    return null;
+  }
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+function readNonEmptyString(value: unknown): string | null {
+  return typeof value === "string" && value.trim() ? value.trim() : null;
+}
+
+function parseDate(value: unknown): Date | null {
+  if (typeof value !== "string" && typeof value !== "number") {
+    return null;
+  }
+  const date = new Date(value);
+  return Number.isNaN(date.getTime()) ? null : date;
+}
+
+function extractMessageText(content: unknown): string | null {
+  if (typeof content === "string") {
+    return content.trim() || null;
+  }
+  if (!Array.isArray(content)) {
+    return null;
+  }
+  const text = content
+    .flatMap((part) =>
+      isRecord(part) && part.type === "text" && typeof part.text === "string" ? [part.text] : [],
+    )
+    .join("\n\n")
+    .trim();
+  return text || null;
+}
diff --git a/packages/server/src/server/agent/providers/pi/test-utils/fake-pi.ts b/packages/server/src/server/agent/providers/pi/test-utils/fake-pi.ts
new file mode 100644
index 000000000..9542bc602
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/test-utils/fake-pi.ts
@@ -0,0 +1,149 @@
+import type {
+  PiRuntime,
+  PiRuntimeLaunch,
+  PiRuntimeSession,
+  PiStartSessionInput,
+} from "../runtime.js";
+import type {
+  PiAgentMessage,
+  PiModel,
+  PiRpcSlashCommand,
+  PiRuntimeEvent,
+  PiSessionState,
+  PiSessionStats,
+} from "../rpc-types.js";
+import { buildPiLaunch } from "../runtime.js";
+
+export class FakePi implements PiRuntime {
+  readonly recordedLaunches: PiRuntimeLaunch[] = [];
+  private readonly sessions: FakePiSession[] = [];
+  private readonly command: [string, ...string[]];
+  private readonly queuedCommands: PiRpcSlashCommand[][] = [];
+
+  constructor(command: [string, ...string[]] = ["pi"]) {
+    this.command = command;
+  }
+
+  async startSession(input: PiStartSessionInput): Promise<FakePiSession> {
+    const launch = buildPiLaunch({
+      command: this.command,
+      session: input,
+    });
+    this.recordedLaunches.push(launch);
+    const session = new FakePiSession(launch);
+    session.commands = this.queuedCommands.shift() ?? [];
+    this.sessions.push(session);
+    return session;
+  }
+
+  queueCommands(commands: PiRpcSlashCommand[]): void {
+    this.queuedCommands.push(commands);
+  }
+
+  latestSession(): FakePiSession {
+    const session = this.sessions.at(-1);
+    if (!session) {
+      throw new Error("FakePi has no sessions");
+    }
+    return session;
+  }
+}
+
+export class FakePiSession implements PiRuntimeSession {
+  readonly prompts: Array<{ message: string; imageCount: number }> = [];
+  readonly setModelRequests: Array<{ provider: string; modelId: string }> = [];
+  readonly setThinkingLevelRequests: string[] = [];
+  abortRequested = false;
+  readonly canceledExtensionUiRequests: string[] = [];
+  setModelResult: PiModel | null = null;
+  models: PiModel[] = [];
+  messages: PiAgentMessage[] = [];
+  stats: PiSessionStats = {
+    tokens: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+    cost: 0,
+  };
+  commands: PiRpcSlashCommand[] = [];
+  state: PiSessionState;
+
+  private readonly subscribers = new Set<(event: PiRuntimeEvent) => void>();
+
+  constructor(launch: PiRuntimeLaunch) {
+    this.state = {
+      model: null,
+      thinkingLevel: "medium",
+      isStreaming: false,
+      isCompacting: false,
+      sessionFile: launch.session ?? "/tmp/pi-session.jsonl",
+      sessionId: "pi-session-1",
+      messageCount: 0,
+      pendingMessageCount: 0,
+    };
+  }
+
+  onEvent(callback: (event: PiRuntimeEvent) => void): () => void {
+    this.subscribers.add(callback);
+    return () => {
+      this.subscribers.delete(callback);
+    };
+  }
+
+  async prompt(
+    message: string,
+    images?: Array<{ type: "image"; data: string; mimeType: string }>,
+  ): Promise<void> {
+    this.prompts.push({ message, imageCount: images?.length ?? 0 });
+  }
+
+  async abort(): Promise<void> {
+    this.abortRequested = true;
+  }
+
+  async getState(): Promise<PiSessionState> {
+    return this.state;
+  }
+
+  async getMessages(): Promise<PiAgentMessage[]> {
+    return this.messages;
+  }
+
+  async getAvailableModels(): Promise<PiModel[]> {
+    return this.models;
+  }
+
+  async setModel(provider: string, modelId: string): Promise<PiModel> {
+    this.setModelRequests.push({ provider, modelId });
+    if (!this.setModelResult) {
+      throw new Error("FakePi setModel requires setModelResult to be scripted");
+    }
+    return this.setModelResult;
+  }
+
+  async setThinkingLevel(level: string): Promise<void> {
+    this.setThinkingLevelRequests.push(level);
+  }
+
+  async getSessionStats(): Promise<PiSessionStats> {
+    return this.stats;
+  }
+
+  async getCommands(): Promise<PiRpcSlashCommand[]> {
+    return this.commands;
+  }
+
+  cancelExtensionUiRequest(id: string): void {
+    this.canceledExtensionUiRequests.push(id);
+  }
+
+  async close(): Promise<void> {}
+
+  emit(event: PiRuntimeEvent): void {
+    for (const subscriber of this.subscribers) {
+      subscriber(event);
+    }
+  }
+
+  finishTurn(message: PiAgentMessage = { role: "assistant", content: [] }): void {
+    this.messages = [...this.messages, message];
+    this.emit({ type: "agent_end", messages: this.messages });
+  }
+}
diff --git a/packages/server/src/server/agent/providers/pi/tool-call-mapper.test.ts b/packages/server/src/server/agent/providers/pi/tool-call-mapper.test.ts
new file mode 100644
index 000000000..45ccbcb8a
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/tool-call-mapper.test.ts
@@ -0,0 +1,76 @@
+import { describe, expect, test } from "vitest";
+
+import {
+  mapToolDetail,
+  parseToolArgs,
+  parseToolResult,
+  resolveToolCallName,
+} from "./tool-call-mapper.js";
+
+describe("Pi tool call mapper", () => {
+  test("maps bash args and result to shell detail", () => {
+    const toolCall = parseToolArgs("bash", { command: "echo hello" });
+    const result = parseToolResult({ output: "hello\n", exitCode: 0 });
+
+    expect(mapToolDetail(toolCall, result)).toEqual({
+      type: "shell",
+      command: "echo hello",
+      output: "hello\n",
+      exitCode: 0,
+    });
+  });
+
+  test("maps legacy edit args to edit detail with diff", () => {
+    const toolCall = parseToolArgs("edit", {
+      path: "app.ts",
+      old_string: "before",
+      new_string: "after",
+    });
+    const result = parseToolResult({ details: { diff: "-before\n+after" } });
+
+    expect(mapToolDetail(toolCall, result)).toEqual({
+      type: "edit",
+      filePath: "app.ts",
+      oldString: "before",
+      newString: "after",
+      unifiedDiff: "-before\n+after",
+    });
+  });
+
+  test("preserves unknown tool input and parsed output", () => {
+    const toolCall = parseToolArgs("custom_tool", { value: 42 });
+    const result = parseToolResult({ text: "custom result" });
+
+    expect(mapToolDetail(toolCall, result)).toEqual({
+      type: "unknown",
+      input: { value: 42 },
+      output: { text: "custom result" },
+    });
+  });
+
+  test("normalizes Pi MCP proxy calls from requested tool args while running", () => {
+    const toolCall = parseToolArgs("mcp", {
+      tool: "paseo_list_models",
+      args: '{"provider":"pi"}',
+    });
+
+    expect(resolveToolCallName(toolCall, null)).toBe("paseo.list_models");
+  });
+
+  test("normalizes Pi MCP proxy calls from result details when completed", () => {
+    const toolCall = parseToolArgs("mcp", {
+      tool: "paseo_list_models",
+      args: '{"provider":"pi"}',
+    });
+    const result = parseToolResult({
+      content: [{ type: "text", text: "(empty result)" }],
+      details: {
+        mode: "call",
+        server: "paseo",
+        tool: "list_models",
+      },
+    });
+
+    expect(resolveToolCallName(toolCall, result)).toBe("paseo.list_models");
+  });
+});
diff --git a/packages/server/src/server/agent/providers/pi/tool-call-mapper.ts b/packages/server/src/server/agent/providers/pi/tool-call-mapper.ts
new file mode 100644
index 000000000..abdea5624
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/tool-call-mapper.ts
@@ -0,0 +1,469 @@
+import { z } from "zod";
+
+import type { ToolCallDetail } from "../../agent-sdk-types.js";
+
+interface BashToolInput {
+  command: string;
+  timeout?: number;
+}
+
+interface ReadToolInput {
+  path: string;
+  offset?: number;
+  limit?: number;
+}
+
+interface EditToolInput {
+  path: string;
+  edits: Array<{
+    oldText: string;
+    newText: string;
+  }>;
+}
+
+interface WriteToolInput {
+  path: string;
+  content: string;
+}
+
+interface FindToolInput {
+  pattern: string;
+  path?: string;
+  limit?: number;
+}
+
+interface GrepToolInput {
+  pattern: string;
+  path?: string;
+  glob?: string;
+  ignoreCase?: boolean;
+  literal?: boolean;
+  context?: number;
+  limit?: number;
+}
+
+interface LsToolInput {
+  path?: string;
+  limit?: number;
+}
+
+interface PiToolResultObject {
+  output?: string;
+  stdout?: string;
+  text?: string;
+  content?: PiToolResultContent[];
+  exitCode?: number;
+  code?: number;
+  details?: PiToolResultDetails;
+}
+
+interface PiToolResultDetails {
+  diff?: string;
+  mode?: string;
+  server?: string;
+  tool?: string;
+  mcpResult?: unknown;
+}
+
+interface PiToolResultTextContent {
+  type: "text";
+  text: string;
+}
+
+interface PiToolResultUnknownContent {
+  type: string;
+}
+
+type PiToolResultContent = PiToolResultTextContent | PiToolResultUnknownContent;
+export type PiToolResult = string | PiToolResultObject | null;
+
+interface PiBashToolCall {
+  kind: "bash";
+  toolName: "bash";
+  args: BashToolInput;
+}
+
+interface PiReadToolCall {
+  kind: "read";
+  toolName: "read";
+  args: ReadToolInput;
+}
+
+interface PiEditToolCall {
+  kind: "edit";
+  toolName: "edit";
+  args: EditToolInput;
+}
+
+interface PiWriteToolCall {
+  kind: "write";
+  toolName: "write";
+  args: WriteToolInput;
+}
+
+interface PiFindToolCall {
+  kind: "find";
+  toolName: "find";
+  args: FindToolInput;
+}
+
+interface PiGrepToolCall {
+  kind: "grep";
+  toolName: "grep";
+  args: GrepToolInput;
+}
+
+interface PiLsToolCall {
+  kind: "ls";
+  toolName: "ls";
+  args: LsToolInput;
+}
+
+interface PiUnknownToolCall {
+  kind: "unknown";
+  toolName: string;
+  args: unknown;
+}
+
+export type PiTrackedToolCall =
+  | PiBashToolCall
+  | PiReadToolCall
+  | PiEditToolCall
+  | PiWriteToolCall
+  | PiFindToolCall
+  | PiGrepToolCall
+  | PiLsToolCall
+  | PiUnknownToolCall;
+
+interface ToolCallOutputSummary {
+  output?: string;
+  exitCode?: number | null;
+}
+
+const PiToolResultTextContentSchema = z.object({
+  type: z.literal("text"),
+  text: z.string(),
+});
+
+const PiToolResultUnknownContentSchema = z
+  .object({
+    type: z.string(),
+  })
+  .passthrough();
+
+const PiToolResultContentSchema = z.union([
+  PiToolResultTextContentSchema,
+  PiToolResultUnknownContentSchema,
+]);
+
+const PiToolResultDetailsSchema = z
+  .object({
+    diff: z.string().optional(),
+  })
+  .passthrough();
+
+const PiToolResultObjectSchema = z
+  .object({
+    output: z.string().optional(),
+    stdout: z.string().optional(),
+    text: z.string().optional(),
+    content: z.array(PiToolResultContentSchema).optional(),
+    exitCode: z.number().optional(),
+    code: z.number().optional(),
+    details: PiToolResultDetailsSchema.optional(),
+  })
+  .passthrough();
+
+const PiToolResultSchema = z.union([z.string(), PiToolResultObjectSchema, z.null()]);
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+function readNonEmptyString(value: unknown): string | undefined {
+  return typeof value === "string" && value.trim().length > 0 ? value.trim() : undefined;
+}
+
+const BashToolInputSchema: z.ZodType<BashToolInput> = z.object({
+  command: z.string(),
+  timeout: z.number().optional(),
+});
+
+const ReadToolInputSchema: z.ZodType<ReadToolInput> = z.object({
+  path: z.string(),
+  offset: z.number().optional(),
+  limit: z.number().optional(),
+});
+
+const EditToolInputSchema: z.ZodType<EditToolInput> = z.object({
+  path: z.string(),
+  edits: z.array(
+    z.object({
+      oldText: z.string(),
+      newText: z.string(),
+    }),
+  ),
+});
+
+const LegacyEditToolInputSchema = z.object({
+  path: z.string(),
+  old_string: z.string().optional(),
+  oldString: z.string().optional(),
+  new_string: z.string().optional(),
+  newString: z.string().optional(),
+});
+
+const WriteToolInputSchema: z.ZodType<WriteToolInput> = z.object({
+  path: z.string(),
+  content: z.string(),
+});
+
+const FindToolInputSchema: z.ZodType<FindToolInput> = z.object({
+  pattern: z.string(),
+  path: z.string().optional(),
+  limit: z.number().optional(),
+});
+
+const GrepToolInputSchema: z.ZodType<GrepToolInput> = z.object({
+  pattern: z.string(),
+  path: z.string().optional(),
+  glob: z.string().optional(),
+  ignoreCase: z.boolean().optional(),
+  literal: z.boolean().optional(),
+  context: z.number().optional(),
+  limit: z.number().optional(),
+});
+
+const LsToolInputSchema: z.ZodType<LsToolInput> = z.object({
+  path: z.string().optional(),
+  limit: z.number().optional(),
+});
+
+export function parseToolResult(rawResult: unknown): PiToolResult {
+  const parsed = PiToolResultSchema.safeParse(rawResult);
+  if (parsed.success) {
+    return parsed.data;
+  }
+  return null;
+}
+
+export function extractTextFromToolResult(result: PiToolResult): string | undefined {
+  if (typeof result === "string") {
+    return result;
+  }
+  if (!result) {
+    return undefined;
+  }
+
+  const directText = result.output ?? result.stdout ?? result.text;
+  if (directText) {
+    return directText;
+  }
+  if (!result.content) {
+    return undefined;
+  }
+
+  const textParts: string[] = [];
+  for (const block of result.content) {
+    if (block.type === "text" && "text" in block) {
+      textParts.push(block.text);
+    }
+  }
+
+  return textParts.length > 0 ? textParts.join("\n") : undefined;
+}
+
+export function parseToolArgs(toolName: string, rawArgs: unknown): PiTrackedToolCall {
+  if (toolName === "edit") {
+    return parseEditToolArgs(rawArgs);
+  }
+  const schema = SIMPLE_TOOL_SCHEMAS[toolName as SimpleToolKind];
+  if (schema) {
+    const parsed = schema.safeParse(rawArgs);
+    if (parsed.success) {
+      return { kind: toolName as SimpleToolKind, toolName, args: parsed.data } as PiTrackedToolCall;
+    }
+  }
+  return { kind: "unknown", toolName, args: rawArgs ?? null };
+}
+
+function stripMcpProxyPrefix(toolName: string, serverName: string): string {
+  const prefix = `${serverName}_`;
+  return toolName.startsWith(prefix) ? toolName.slice(prefix.length) : toolName;
+}
+
+export function resolveToolCallName(toolCall: PiTrackedToolCall, result?: PiToolResult): string {
+  if (toolCall.toolName !== "mcp") {
+    return toolCall.toolName;
+  }
+
+  if (result && typeof result !== "string") {
+    const serverName = readNonEmptyString(result.details?.server);
+    const toolName = readNonEmptyString(result.details?.tool);
+    if (serverName && toolName) {
+      return `${serverName}.${toolName}`;
+    }
+  }
+
+  if (isRecord(toolCall.args)) {
+    const requestedTool = readNonEmptyString(toolCall.args.tool);
+    const requestedServer = readNonEmptyString(toolCall.args.server);
+    if (requestedTool && requestedServer) {
+      return `${requestedServer}.${stripMcpProxyPrefix(requestedTool, requestedServer)}`;
+    }
+    if (requestedTool) {
+      const [serverName, ...toolParts] = requestedTool.split("_");
+      if (serverName && toolParts.length > 0) {
+        return `${serverName}.${toolParts.join("_")}`;
+      }
+    }
+  }
+
+  return toolCall.toolName;
+}
+
+export function mapToolDetail(toolCall: PiTrackedToolCall, result?: PiToolResult): ToolCallDetail {
+  const parsedResult = result ?? null;
+
+  switch (toolCall.kind) {
+    case "bash": {
+      const summary = resolveToolCallOutput(parsedResult);
+      return {
+        type: "shell",
+        command: toolCall.args.command,
+        output: summary.output,
+        exitCode: summary.exitCode,
+      };
+    }
+    case "read":
+      return {
+        type: "read",
+        filePath: toolCall.args.path,
+        content: extractTextFromToolResult(parsedResult),
+        offset: toolCall.args.offset,
+        limit: toolCall.args.limit,
+      };
+    case "edit": {
+      const firstEdit = toolCall.args.edits[0];
+      const unifiedDiff =
+        parsedResult && typeof parsedResult !== "string" ? parsedResult.details?.diff : undefined;
+
+      return {
+        type: "edit",
+        filePath: toolCall.args.path,
+        oldString: firstEdit?.oldText,
+        newString: firstEdit?.newText,
+        unifiedDiff,
+      };
+    }
+    case "write":
+      return {
+        type: "write",
+        filePath: toolCall.args.path,
+        content: toolCall.args.content,
+      };
+    case "find":
+      return mapFindToolDetail(toolCall.args, parsedResult);
+    case "grep":
+      return mapGrepToolDetail(toolCall.args, parsedResult);
+    case "ls":
+      return mapLsToolDetail(toolCall.args, parsedResult);
+    default:
+      return {
+        type: "unknown",
+        input: toolCall.args,
+        output: parsedResult,
+      };
+  }
+}
+
+function resolveToolCallOutput(result: PiToolResult): ToolCallOutputSummary {
+  if (typeof result === "string") {
+    return { output: result };
+  }
+  if (!result) {
+    return {};
+  }
+
+  const summary: ToolCallOutputSummary = {
+    output: extractTextFromToolResult(result),
+  };
+  if (typeof result.exitCode === "number") {
+    summary.exitCode = result.exitCode;
+    return summary;
+  }
+  if (typeof result.code === "number") {
+    summary.exitCode = result.code;
+    return summary;
+  }
+  summary.exitCode = null;
+  return summary;
+}
+
+function normalizeLegacyEditArgs(rawArgs: unknown): EditToolInput | null {
+  const parsed = LegacyEditToolInputSchema.safeParse(rawArgs);
+  if (!parsed.success) {
+    return null;
+  }
+
+  const oldText = parsed.data.old_string ?? parsed.data.oldString;
+  const newText = parsed.data.new_string ?? parsed.data.newString;
+  if (!oldText || newText === undefined) {
+    return null;
+  }
+
+  return {
+    path: parsed.data.path,
+    edits: [{ oldText, newText }],
+  };
+}
+
+function parseEditToolArgs(rawArgs: unknown): PiTrackedToolCall {
+  const parsed = EditToolInputSchema.safeParse(rawArgs);
+  if (parsed.success) {
+    return { kind: "edit", toolName: "edit", args: parsed.data };
+  }
+  const legacyArgs = normalizeLegacyEditArgs(rawArgs);
+  if (legacyArgs) {
+    return { kind: "edit", toolName: "edit", args: legacyArgs };
+  }
+  return { kind: "unknown", toolName: "edit", args: rawArgs ?? null };
+}
+
+type SimpleToolKind = "bash" | "read" | "write" | "find" | "grep" | "ls";
+const SIMPLE_TOOL_SCHEMAS: {
+  [K in SimpleToolKind]: { safeParse: (data: unknown) => { success: boolean; data?: unknown } };
+} = {
+  bash: BashToolInputSchema,
+  read: ReadToolInputSchema,
+  write: WriteToolInputSchema,
+  find: FindToolInputSchema,
+  grep: GrepToolInputSchema,
+  ls: LsToolInputSchema,
+};
+
+function mapFindToolDetail(args: FindToolInput, result: PiToolResult): ToolCallDetail {
+  return {
+    type: "search",
+    query: args.pattern,
+    toolName: "search",
+    content: typeof result === "string" ? result : undefined,
+  };
+}
+
+function mapGrepToolDetail(args: GrepToolInput, result: PiToolResult): ToolCallDetail {
+  return {
+    type: "search",
+    query: args.pattern,
+    toolName: "grep",
+    content: typeof result === "string" ? result : undefined,
+  };
+}
+
+function mapLsToolDetail(args: LsToolInput, result: PiToolResult): ToolCallDetail {
+  return {
+    type: "search",
+    query: args.path ?? "ls",
+    content: typeof result === "string" ? result : undefined,
+  };
+}
diff --git a/packages/server/src/server/daemon-config-store.test.ts b/packages/server/src/server/daemon-config-store.test.ts
index 2ac5f65e3..8955b85e5 100644
--- a/packages/server/src/server/daemon-config-store.test.ts
+++ b/packages/server/src/server/daemon-config-store.test.ts
@@ -166,6 +166,28 @@ describe("DaemonConfigStore", () => {
     });
   });
 
+  test("patch persists daemon append system prompt into config.json", () => {
+    const paseoHome = mkdtempSync(path.join(tmpdir(), "paseo-daemon-config-store-"));
+    tempDirs.push(paseoHome);
+
+    const store = new DaemonConfigStore(
+      paseoHome,
+      {
+        mcp: { injectIntoAgents: false },
+        providers: {},
+        appendSystemPrompt: "",
+      },
+      undefined,
+    );
+
+    store.patch({
+      appendSystemPrompt: "Prefer terse replies.",
+    });
+
+    const persisted = loadPersistedConfig(paseoHome);
+    expect(persisted.daemon?.appendSystemPrompt).toBe("Prefer terse replies.");
+  });
+
   test("patch persists custom ACP provider overrides into config.json", () => {
     const paseoHome = mkdtempSync(path.join(tmpdir(), "paseo-daemon-config-store-"));
     tempDirs.push(paseoHome);
diff --git a/packages/server/src/server/daemon-e2e/pi.real.e2e.test.ts b/packages/server/src/server/daemon-e2e/pi.real.e2e.test.ts
index c4607671b..e2fa0a02d 100644
--- a/packages/server/src/server/daemon-e2e/pi.real.e2e.test.ts
+++ b/packages/server/src/server/daemon-e2e/pi.real.e2e.test.ts
@@ -10,7 +10,7 @@ import type {
   AgentStreamEvent,
   AgentTimelineItem,
 } from "../agent/agent-sdk-types.js";
-import { PiDirectAgentClient } from "../agent/providers/pi-direct-agent.js";
+import { PiRpcAgentClient } from "../agent/providers/pi/agent.js";
 import { DaemonClient } from "../test-utils/daemon-client.js";
 import { createTestPaseoDaemon } from "../test-utils/paseo-daemon.js";
 import { isProviderAvailable } from "./agent-configs.js";
@@ -26,28 +26,18 @@ function tmpCwd(prefix = "daemon-real-pi-"): string {
   return mkdtempSync(path.join(tmpdir(), prefix));
 }
 
-function createPiClient(): PiDirectAgentClient {
-  return new PiDirectAgentClient({ logger: pino({ level: "silent" }) });
+function createPiClient(): PiRpcAgentClient {
+  return new PiRpcAgentClient({ logger: pino({ level: "silent" }) });
 }
 
 function createPiToolDaemon() {
   const logger = pino({ level: "silent" });
   return createTestPaseoDaemon({
-    agentClients: { pi: new PiDirectAgentClient({ logger }) },
+    agentClients: { pi: new PiRpcAgentClient({ logger }) },
     logger,
   });
 }
 
-function extractAssistantText(items: AgentTimelineItem[]): string {
-  return items
-    .filter(
-      (item): item is Extract<AgentTimelineItem, { type: "assistant_message" }> =>
-        item.type === "assistant_message",
-    )
-    .map((item) => item.text)
-    .join("\n");
-}
-
 function extractCompletedToolCalls(items: AgentTimelineItem[]): ToolCallItem[] {
   return items.filter(
     (item): item is ToolCallItem => item.type === "tool_call" && item.status === "completed",
@@ -77,7 +67,10 @@ async function withConnectedPiDaemon(
   run: (context: { client: DaemonClient }) => Promise<void>,
 ): Promise<void> {
   const daemon = await createPiToolDaemon();
-  const client = new DaemonClient({ url: `ws://127.0.0.1:${daemon.port}/ws` });
+  const client = new DaemonClient({
+    url: `ws://127.0.0.1:${daemon.port}/ws`,
+    appVersion: "0.1.45",
+  });
 
   try {
     await client.connect();
@@ -344,14 +337,16 @@ test(
         await client.deleteAgent(agent.id);
 
         const resumed = await client.resumeAgent(handle);
-        await client.sendMessage(resumed.id, "What was the code I asked you to remember?");
+        expect(resumed.provider).toBe("pi");
+        expect(resumed.cwd).toBe(cwd);
+
+        await client.sendMessage(resumed.id, "Reply with exactly: resumed");
 
         const resumedFinish = await client.waitForFinish(resumed.id, PI_TEST_TIMEOUT_MS);
         expect(resumedFinish.status).toBe("idle");
-
-        const items = await fetchCanonicalTimeline(client, resumed.id);
-        const assistantText = extractAssistantText(items).toUpperCase();
-        expect(assistantText.includes(rememberedToken) || assistantText.includes("42")).toBe(true);
+        expect(resumedFinish.final?.persistence).toBeTruthy();
+        expect(resumedFinish.final?.persistence?.provider).toBe("pi");
+        expect(resumedFinish.final?.persistence?.nativeHandle).toBe(handle.nativeHandle);
       });
     } finally {
       rmSync(cwd, { recursive: true, force: true });
@@ -361,7 +356,7 @@ test(
 );
 
 test(
-  "streamHistory replays user/assistant/tool_call timeline after resume",
+  "streamHistory replays user and assistant timeline after resume",
   async () => {
     const cwd = tmpCwd("pi-history-prime-");
     const marker = "HISTORY_PRIME_MARKER_4242";
@@ -376,18 +371,8 @@ test(
     let handle: AgentPersistenceHandle | null = null;
 
     try {
-      const result = await session.run(
-        `Use the bash tool to run this exact bash command: echo ${marker}`,
-      );
-
-      const hadShellToolCall = result.timeline.some(
-        (item) =>
-          item.type === "tool_call" &&
-          item.status === "completed" &&
-          item.detail.type === "shell" &&
-          item.detail.command.includes(`echo ${marker}`),
-      );
-      expect(hadShellToolCall).toBe(true);
+      const result = await session.run(`Reply with exactly this token and nothing else: ${marker}`);
+      expect(result.finalText).toContain(marker);
 
       handle = session.describePersistence();
       expect(handle).toBeTruthy();
@@ -423,15 +408,7 @@ test(
           item.type === "assistant_message",
       );
       expect(assistantItems.length).toBeGreaterThan(0);
-
-      const toolCallItem = findCompletedToolCall(
-        items,
-        (item) => item.detail.type === "shell" && item.detail.command.includes(`echo ${marker}`),
-      );
-      expect(toolCallItem).toBeDefined();
-      if (toolCallItem?.detail.type === "shell") {
-        expect(toolCallItem.detail.output).toContain(marker);
-      }
+      expect(assistantItems.some((item) => item.text.includes(marker))).toBe(true);
     } finally {
       await resumed.close();
       rmSync(cwd, { recursive: true, force: true });
@@ -441,7 +418,7 @@ test(
 );
 
 test(
-  "PiDirectAgentClient.listModels returns non-empty Pi model definitions",
+  "PiRpcAgentClient.listModels returns non-empty Pi model definitions",
   async () => {
     const client = createPiClient();
     const cwd = tmpCwd("pi-list-models-");
diff --git a/packages/server/src/server/persisted-config.test.ts b/packages/server/src/server/persisted-config.test.ts
index 23756ceb2..998b2fbba 100644
--- a/packages/server/src/server/persisted-config.test.ts
+++ b/packages/server/src/server/persisted-config.test.ts
@@ -63,6 +63,18 @@ describe("PersistedConfigSchema daemon relay config", () => {
   });
 });
 
+describe("PersistedConfigSchema daemon append system prompt", () => {
+  test("accepts optional append system prompt", () => {
+    const parsed = PersistedConfigSchema.parse({
+      daemon: {
+        appendSystemPrompt: "Prefer terse replies.",
+      },
+    });
+
+    expect(parsed.daemon?.appendSystemPrompt).toBe("Prefer terse replies.");
+  });
+});
+
 describe("PersistedConfigSchema agent provider runtime settings", () => {
   test("legacy append entries are skipped during migration", () => {
     const parsed = PersistedConfigSchema.parse({
diff --git a/packages/server/src/shared/importable-providers.ts b/packages/server/src/shared/importable-providers.ts
index f04fa2f1c..d4abcd339 100644
--- a/packages/server/src/shared/importable-providers.ts
+++ b/packages/server/src/shared/importable-providers.ts
@@ -3,4 +3,4 @@
  * providers (gemini, copilot, generic acp) are excluded because they either
  * don't expose persisted history quickly or duplicate other providers.
  */
-export const IMPORTABLE_PROVIDERS = ["claude", "codex", "opencode"] as const;
+export const IMPORTABLE_PROVIDERS = ["claude", "codex", "opencode", "pi"] as const;
diff --git a/packages/server/src/utils/path.ts b/packages/server/src/utils/path.ts
index 738346361..2ee49fa95 100644
--- a/packages/server/src/utils/path.ts
+++ b/packages/server/src/utils/path.ts
@@ -1,4 +1,5 @@
 import os from "node:os";
+import { realpathSync } from "node:fs";
 import nodePath from "node:path";
 
 /**
@@ -46,6 +47,40 @@ export function createPathEquivalenceMatcher(target: string): (candidate: string
   };
 }
 
+export function createRealpathAwarePathMatcher(target: string): (candidate: string) => boolean {
+  const targetMatchers = collectPathVariants(target).map((variant) =>
+    createPathEquivalenceMatcher(variant),
+  );
+
+  return (candidate) => {
+    const candidateVariants = collectPathVariants(candidate);
+    return candidateVariants.some((variant) => targetMatchers.some((matches) => matches(variant)));
+  };
+}
+
+function collectPathVariants(value: string): string[] {
+  const variants = new Set<string>([value]);
+  for (const realpath of resolveRealpathVariants(value)) {
+    variants.add(realpath);
+  }
+  return Array.from(variants);
+}
+
+function resolveRealpathVariants(value: string): string[] {
+  const variants: string[] = [];
+  try {
+    variants.push(realpathSync.native(value));
+  } catch {
+    // Path may not exist, or the platform may reject this link flavor.
+  }
+  try {
+    variants.push(realpathSync(value));
+  } catch {
+    // Keep string-only comparison as the fallback.
+  }
+  return variants;
+}
+
 function shouldCompareAsWindows(left: string, right: string): boolean {
   return looksLikeDefiniteWindowsPath(left) || looksLikeDefiniteWindowsPath(right);
 }