diff --git a/packages/server/src/server/agent/providers/acp-agent.ts b/packages/server/src/server/agent/providers/acp-agent.ts
index a647deb549..e5d1e4c48e 100644
--- a/packages/server/src/server/agent/providers/acp-agent.ts
+++ b/packages/server/src/server/agent/providers/acp-agent.ts
@@ -76,6 +76,8 @@ import {
   type AgentPersistenceHandle,
   type AgentPromptContentBlock,
   type AgentPromptInput,
+  type AgentResumePurpose,
+  type AgentResumeSessionOptions,
   type AgentRunOptions,
   type AgentRunResult,
   type AgentRuntimeInfo,
@@ -148,6 +150,18 @@ function rejectOnSpawnError(child: ChildProcess, stderrChunks: string[]): Promis
   });
 }
 
+async function isDirectory(target: string): Promise<boolean> {
+  try {
+    return (await fs.stat(target)).isDirectory();
+  } catch (error) {
+    const code = (error as NodeJS.ErrnoException).code;
+    if (code === "ENOENT" || code === "ENOTDIR") {
+      return false;
+    }
+    throw error;
+  }
+}
+
 function isRecord(value: unknown): value is Record<string, unknown> {
   return value != null && typeof value === "object" && !Array.isArray(value);
 }
@@ -497,6 +511,7 @@ interface ACPAgentSessionOptions {
   capabilities: AgentCapabilityFlags;
   extensionCommandsParser?: ACPExtensionCommandsParser;
   handle?: AgentPersistenceHandle;
+  resumePurpose?: AgentResumePurpose;
   agentId?: string;
   launchEnv?: Record<string, string>;
   waitForInitialCommands?: boolean;
@@ -1006,6 +1021,7 @@ export class ACPAgentClient implements AgentClient {
     handle: AgentPersistenceHandle,
     overrides?: Partial<AgentSessionConfig>,
     launchContext?: AgentLaunchContext,
+    options?: AgentResumeSessionOptions,
   ): Promise<AgentSession> {
     if (handle.provider !== this.provider) {
       throw new Error(`Cannot resume ${handle.provider} handle with ${this.provider} provider`);
@@ -1047,6 +1063,7 @@ export class ACPAgentClient implements AgentClient {
           providerOptions.supportsMcpServers ?? this.capabilities.supportsMcpServers,
       },
       handle,
+      resumePurpose: options?.purpose,
       agentId: launchContext?.agentId,
       launchEnv: launchContext?.env,
       extensionCommandsParser: this.extensionCommandsParser,
@@ -1700,6 +1717,7 @@ export class ACPAgentSession implements AgentSession, ACPClient {
   private readonly terminalEntries = new Map<string, TerminalEntry>();
   private readonly persistedHistory: AgentTimelineItem[] = [];
   private readonly initialHandle?: AgentPersistenceHandle;
+  private readonly resumePurpose: AgentResumePurpose;
 
   private readonly config: AgentSessionConfig;
   private child: ChildProcessWithoutNullStreams | null = null;
@@ -1753,6 +1771,7 @@ export class ACPAgentSession implements AgentSession, ACPClient {
     this.agentId = options.agentId;
     this.launchEnv = options.launchEnv;
     this.initialHandle = options.handle;
+    this.resumePurpose = options.resumePurpose ?? "interactive";
     this.config = { ...config, provider: options.provider };
     this.currentMode = config.modeId ?? null;
     this.currentModel = config.model ?? null;
@@ -2770,6 +2789,16 @@ export class ACPAgentSession implements AgentSession, ACPClient {
     return {};
   }
 
+  // Loading an archived agent's history runs nothing in its working directory, which
+  // may have been removed with its worktree. session/load still names the original
+  // directory; only the process starts from the home directory.
+  private async resolveProcessCwd(): Promise<string> {
+    if (this.resumePurpose !== "history" || (await isDirectory(this.config.cwd))) {
+      return this.config.cwd;
+    }
+    return homedir();
+  }
+
   private async spawnProcess(): Promise<SpawnedACPProcess> {
     const prefix = await resolveProviderLaunch({
       commandConfig: this.runtimeSettings?.command,
@@ -2783,7 +2812,7 @@ export class ACPAgentSession implements AgentSession, ACPClient {
     const command = prefix.command;
     const args = [...prefix.args, ...this.defaultCommand.slice(1)];
     const child = spawnProcess(command, args, {
-      cwd: this.config.cwd,
+      cwd: await this.resolveProcessCwd(),
       ...createProviderEnvSpec({
         runtimeSettings: this.runtimeSettings,
         overlays: [this.launchEnv],
diff --git a/packages/server/src/server/agent/providers/generic-acp-agent.archived-history.test.ts b/packages/server/src/server/agent/providers/generic-acp-agent.archived-history.test.ts
new file mode 100644
index 0000000000..ec17dd7ecf
--- /dev/null
+++ b/packages/server/src/server/agent/providers/generic-acp-agent.archived-history.test.ts
@@ -0,0 +1,154 @@
+import { mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+
+import { describe, expect, test } from "vitest";
+
+import { createTestLogger } from "../../../test-utils/test-logger.js";
+import type { AgentStreamEvent } from "../agent-sdk-types.js";
+import { GenericACPAgentClient } from "./generic-acp-agent.js";
+
+describe("GenericACPAgentClient archived history", () => {
+  test("replays an archived session whose working directory was removed", async () => {
+    await withFakeACPAgent(async ({ command, removedCwd, loadRequestsPath }) => {
+      const client = new GenericACPAgentClient({ logger: createTestLogger(), command });
+
+      const session = await client.resumeSession(
+        { provider: "acp", sessionId: "archived-session", metadata: { cwd: removedCwd } },
+        undefined,
+        undefined,
+        { purpose: "history" },
+      );
+      try {
+        expect(await collectTimelineText(session.streamHistory())).toEqual([
+          "user_message:What is in the README?",
+          "assistant_message:It describes the project.",
+        ]);
+        const loadRequests = JSON.parse(await readFile(loadRequestsPath, "utf8"));
+        expect(loadRequests).toEqual([{ sessionId: "archived-session", cwd: removedCwd }]);
+      } finally {
+        await session.close();
+      }
+    });
+  });
+
+  test("replays an archived session whose working directory path is now a file", async () => {
+    await withFakeACPAgent(async ({ command, removedCwd }) => {
+      await writeFile(removedCwd, "not a directory", "utf8");
+      const client = new GenericACPAgentClient({ logger: createTestLogger(), command });
+
+      const session = await client.resumeSession(
+        { provider: "acp", sessionId: "archived-session", metadata: { cwd: removedCwd } },
+        undefined,
+        undefined,
+        { purpose: "history" },
+      );
+      try {
+        expect(await collectTimelineText(session.streamHistory())).toEqual([
+          "user_message:What is in the README?",
+          "assistant_message:It describes the project.",
+        ]);
+      } finally {
+        await session.close();
+      }
+    });
+  });
+
+  test("still requires the working directory to resume a session that will run", async () => {
+    await withFakeACPAgent(async ({ command, removedCwd }) => {
+      const client = new GenericACPAgentClient({ logger: createTestLogger(), command });
+
+      await expect(
+        client.resumeSession(
+          { provider: "acp", sessionId: "archived-session", metadata: { cwd: removedCwd } },
+          undefined,
+          undefined,
+          { purpose: "interactive" },
+        ),
+      ).rejects.toThrow("ENOENT");
+    });
+  });
+});
+
+async function collectTimelineText(events: AsyncGenerator<AgentStreamEvent>): Promise<string[]> {
+  const text: string[] = [];
+  for await (const event of events) {
+    if (event.type !== "timeline") {
+      continue;
+    }
+    if (event.item.type === "user_message" || event.item.type === "assistant_message") {
+      text.push(`${event.item.type}:${event.item.text}`);
+    }
+  }
+  return text;
+}
+
+async function withFakeACPAgent(
+  run: (input: {
+    command: [string, ...string[]];
+    removedCwd: string;
+    loadRequestsPath: string;
+  }) => Promise<void>,
+): Promise<void> {
+  const testDir = await mkdtemp(path.join(tmpdir(), "paseo-acp-archived-history-"));
+  try {
+    const scriptPath = path.join(testDir, "fake-acp-agent.cjs");
+    const loadRequestsPath = path.join(testDir, "load-requests.json");
+    await writeFile(scriptPath, fakeACPAgentScript, "utf8");
+    await run({
+      command: [process.execPath, scriptPath, loadRequestsPath],
+      removedCwd: path.join(testDir, "removed-worktree"),
+      loadRequestsPath,
+    });
+  } finally {
+    await rm(testDir, { recursive: true, force: true });
+  }
+}
+
+const fakeACPAgentScript = `
+const fs = require("node:fs");
+const readline = require("node:readline");
+
+const loadRequestsPath = process.argv[2];
+const loadRequests = [];
+const rl = readline.createInterface({ input: process.stdin });
+
+function write(message) {
+  process.stdout.write(JSON.stringify({ jsonrpc: "2.0", ...message }) + "\\n");
+}
+
+function replay(sessionId, sessionUpdate, text) {
+  write({
+    method: "session/update",
+    params: { sessionId, update: { sessionUpdate, content: { type: "text", text } } },
+  });
+}
+
+rl.on("line", (line) => {
+  const message = JSON.parse(line);
+  if (message.method === "initialize") {
+    write({
+      id: message.id,
+      result: {
+        protocolVersion: message.params?.protocolVersion ?? 1,
+        agentCapabilities: { loadSession: true, sessionCapabilities: { close: {} } },
+      },
+    });
+    return;
+  }
+
+  if (message.method === "session/load") {
+    const { sessionId, cwd } = message.params;
+    loadRequests.push({ sessionId, cwd });
+    fs.writeFileSync(loadRequestsPath, JSON.stringify(loadRequests));
+    replay(sessionId, "user_message_chunk", "What is in the README?");
+    replay(sessionId, "agent_message_chunk", "It describes the project.");
+    write({ id: message.id, result: {} });
+    return;
+  }
+
+  if (message.id !== undefined) {
+    write({ id: message.id, result: {} });
+  }
+});
+`;