fix(claude): scan large transcript records once

Retain unfinished record chunks and assemble each record once instead of copying and rescanning a growing buffer on every backward read. Cover import of a large record after the last explicit rename.

nix/desktop-package.nix

@@ -127,7 +127,7 @@ buildNpmPackage {
         # The Nix output is not a distributable DMG, so leave it unsigned and
         # disable the hardened runtime that requires a matching signature.
         CSC_IDENTITY_AUTO_DISCOVERY=false \
-          ../../node_modules/.bin/electron-builder \
+          npm exec --offline -- electron-builder \
             --config electron-builder.yml \
             --dir \
             --mac \

nix/npm-deps.hash

@@ -1 +1 @@
-sha256-CeT2PtYIAFwvBC9LIku8VkTl0pvKxYzSCn0QW2ManfU=
+sha256-KN/AVZV/o0TleLLpmggSrdJqjFDJ/NJYVHiC54xb4jQ=

packages/app/e2e/browser/composer-recall.spec.ts

@@ -3,7 +3,7 @@ import {
   composerLocator,
   expectComposerDraft,
   expectComposerVisible,
-  submitMessage,
+  fillComposerDraft,
   typeIntoFocusedComposer,
 } from "../support/helpers/composer";
 import { openAgentRoute, seedMockAgentWorkspace } from "../support/helpers/mock-agent";
@@ -12,8 +12,14 @@ function userMessages(page: Page) {
   return page.getByTestId("user-message");
 }
 
+async function sendDraftWhenReady(page: Page) {
+  await expect(page.getByRole("button", { name: "Send message", exact: true })).toBeEnabled();
+  await pressInComposer(page, "Enter");
+}
+
 async function sendAndWaitForMessage(page: Page, text: string, expectedCount: number) {
-  await submitMessage(page, text);
+  await fillComposerDraft(page, text);
+  await sendDraftWhenReady(page);
   await expect(userMessages(page)).toHaveCount(expectedCount, { timeout: 30_000 });
   await expectComposerDraft(page, "");
 }
@@ -49,7 +55,7 @@ test.describe("Composer recall", () => {
       await pressInComposer(page, "ArrowUp");
       await expectComposerDraft(page, "add tests for login");
 
-      await pressInComposer(page, "Enter");
+      await sendDraftWhenReady(page);
       await expect(userMessages(page)).toHaveCount(3, { timeout: 30_000 });
       await expect(userMessages(page).last()).toContainText("add tests for login");
     } finally {

packages/desktop/package.json

@@ -41,7 +41,7 @@
     "@types/node": "24.6.0",
     "@types/ws": "^8.5.14",
     "electron": "44.2.0",
-    "electron-builder": "26.8.1",
+    "electron-builder": "26.18.0",
     "typescript": "5.9.3",
     "unzip-crx-3": "^0.2.0",
     "vitest": "^4.1.6",

packages/server/src/server/agent/providers/acp-agent.ts

@@ -120,6 +120,7 @@ import {
 } from "../provider-launch-config.js";
 import { renderPromptAttachmentAsText } from "../prompt-attachments.js";
 import { appendOrReplaceGrowingAssistantMessage, runProviderTurn } from "./provider-runner.js";
+import { resolveResumeProcessCwd } from "./resume-process-cwd.js";
 import {
   buildStringCommandShellInvocation,
   createStringCommandShellEnvOverlay,
@@ -165,18 +166,6 @@ function rejectOnProcessFailure(child: ChildProcess, stderrChunks: string[]): Pr
   });
 }
 
-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);
 }
@@ -2883,11 +2872,8 @@ export class ACPAgentSession implements AgentSession, ACPClient {
   // 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 resolveProcessCwd(): Promise<string> {
+    return resolveResumeProcessCwd(this.config.cwd, this.resumePurpose);
   }
 
   private async spawnProcess(): Promise<SpawnedACPProcess> {

packages/server/src/server/agent/providers/claude/agent.import-titles.test.ts

@@ -1,3 +1,4 @@
+import { constants as bufferConstants } from "node:buffer";
 import * as fs from "node:fs/promises";
 import * as os from "node:os";
 import * as path from "node:path";
@@ -236,4 +237,64 @@ describe("importing a renamed Claude session", () => {
 
     await expect(importSession(sessionId)).rejects.toThrow();
   });
+
+  test("reads the rename from a transcript too large to hold as one string", async () => {
+    const sessionId = "oversized-transcript";
+    const projectDir = claudeProjectDirSync(SESSION_CWD, { configDir });
+    await fs.mkdir(projectDir, { recursive: true });
+    const transcript = path.join(projectDir, `${sessionId}.jsonl`);
+    // A hole stands in for the long session this used to fail on: the file only
+    // has to be longer than a string can be, and the rename sits at its end.
+    await fs.writeFile(transcript, "");
+    await fs.truncate(transcript, bufferConstants.MAX_STRING_LENGTH + 1);
+    await fs.appendFile(
+      transcript,
+      `\n${[
+        userRecord({ sessionId, content: "Trace the slow query" }),
+        { type: "custom-title", customTitle: "Slow query hunt", sessionId },
+      ]
+        .map((record) => JSON.stringify(record))
+        .join("\n")}\n`,
+    );
+
+    const imported = await importSession(sessionId);
+
+    expect(imported.config.title).toBe("Slow query hunt");
+  });
+
+  test("reads the rename from behind more records than one read covers", async () => {
+    const sessionId = "late-records-rename";
+    await writeSession({
+      sessionId,
+      records: [
+        userRecord({ sessionId, content: "Review this project" }),
+        { type: "custom-title", customTitle: "Scrollback review", sessionId },
+        // One record longer than a single read, then enough records to leave the
+        // rename several reads back from the end of the file.
+        userRecord({ sessionId, content: "x".repeat(128 * 1024) }),
+        ...Array.from({ length: 64 }, (_, index) =>
+          userRecord({ sessionId, content: `${"y".repeat(4 * 1024)} ${index}` }),
+        ),
+      ],
+    });
+
+    const imported = await importSession(sessionId);
+
+    expect(imported.config.title).toBe("Scrollback review");
+  });
+
+  test("imports a large record after the last rename without repeatedly copying it", async () => {
+    const sessionId = "large-record-after-rename";
+    await writeSession({
+      sessionId,
+      records: [
+        { type: "custom-title", customTitle: "Large attachment review", sessionId },
+        userRecord({ sessionId, content: "x".repeat(96 * 1024 * 1024) }),
+      ],
+    });
+
+    const imported = await importSession(sessionId);
+
+    expect(imported.config.title).toBe("Large attachment review");
+  });
 });

packages/server/src/server/agent/providers/claude/agent.ts

@@ -6853,40 +6853,79 @@ function normalizeClaudeSessionTitle(title: string | null): string | null {
 }
 
 const CLAUDE_CUSTOM_TITLE_TYPE = "custom-title";
+const CLAUDE_CUSTOM_TITLE_NEEDLE = Buffer.from(`"${CLAUDE_CUSTOM_TITLE_TYPE}"`);
+const CLAUDE_TITLE_SCAN_CHUNK_BYTES = 64 * 1024;
+
+function readClaudeCustomTitleFromRecord(record: Buffer): string | null {
+  // The needle also matches a prompt that quotes it, so a record still has to
+  // parse as a `custom-title` entry carrying a usable name. Records without the
+  // needle are never decoded, so a long one costs a byte search and nothing more.
+  if (!record.includes(CLAUDE_CUSTOM_TITLE_NEEDLE)) {
+    return null;
+  }
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(record.toString("utf8").trim());
+  } catch {
+    return null;
+  }
+  const entry = toObjectRecord(parsed);
+  if (!entry || entry.isSidechain || entry.type !== CLAUDE_CUSTOM_TITLE_TYPE) {
+    return null;
+  }
+  return normalizeClaudeSessionTitle(
+    typeof entry.customTitle === "string" ? entry.customTitle : null,
+  );
+}
 
 /**
  * The `custom-title` record is re-emitted every time the session is saved, so
- * the current name is the last usable one in the file. Searching backwards finds it without
- * walking the transcript, which matters because sessions reach tens of
- * megabytes.
+ * the current name is the last usable one in the file. Reading backwards a chunk
+ * at a time finds it without walking the transcript, which matters because
+ * sessions reach tens of megabytes, and never holds the file as one string, so a
+ * transcript past V8's maximum string length still imports.
  */
-function readLastClaudeCustomTitle(content: string): string | null {
-  const needle = `"${CLAUDE_CUSTOM_TITLE_TYPE}"`;
-  let at = content.lastIndexOf(needle);
-  while (at >= 0) {
-    const lineStart = content.lastIndexOf("\n", at) + 1;
-    const lineEnd = content.indexOf("\n", at);
-    const line = lineEnd === -1 ? content.slice(lineStart) : content.slice(lineStart, lineEnd);
-    let parsed: unknown;
-    try {
-      parsed = JSON.parse(line.trim());
-    } catch {
-      parsed = undefined;
-    }
-    const entry = toObjectRecord(parsed);
-    if (entry && !entry.isSidechain && entry.type === CLAUDE_CUSTOM_TITLE_TYPE) {
-      const title = normalizeClaudeSessionTitle(
-        typeof entry.customTitle === "string" ? entry.customTitle : null,
+async function readLastClaudeCustomTitle(filePath: string): Promise<string | null> {
+  const handle = await fsPromises.open(filePath, "r");
+  try {
+    const stats = await handle.stat();
+    if (!stats.isFile()) {
+      // Opening a directory succeeds on Windows even though reading it does not,
+      // so reject the way reading the transcript as a file would.
+      throw Object.assign(
+        new Error(`EISDIR: illegal operation on a directory, read '${filePath}'`),
+        { code: "EISDIR", path: filePath },
       );
-      if (title) {
-        return title;
-      }
     }
-    // The needle also matches a prompt that quotes it, and a record can carry no
-    // usable name, so keep looking backwards for one that does.
-    at = at <= 0 ? -1 : content.lastIndexOf(needle, at - 1);
+    let end = stats.size;
+    // Retain unfinished record pieces in reverse file order. Assemble each
+    // complete record once, so a large tool/image record costs linear work.
+    let pieces: Buffer[] = [];
+    while (end > 0) {
+      const length = Math.min(CLAUDE_TITLE_SCAN_CHUNK_BYTES, end);
+      const chunk = Buffer.alloc(length);
+      await handle.read(chunk, 0, length, end - length);
+      let recordEnd = chunk.length;
+      for (
+        let at = chunk.lastIndexOf(10);
+        at >= 0;
+        at = at === 0 ? -1 : chunk.lastIndexOf(10, at - 1)
+      ) {
+        pieces.push(chunk.subarray(at + 1, recordEnd));
+        const record = Buffer.concat(pieces.toReversed());
+        const title = readClaudeCustomTitleFromRecord(record);
+        if (title) return title;
+        pieces = [];
+        recordEnd = at;
+      }
+      if (recordEnd > 0) pieces.push(chunk.subarray(0, recordEnd));
+      end -= length;
+    }
+    // The first record in the file has no newline in front of it.
+    return readClaudeCustomTitleFromRecord(Buffer.concat(pieces.toReversed()));
+  } finally {
+    await handle.close();
   }
-  return null;
 }
 
 function isErrnoException(error: unknown): error is NodeJS.ErrnoException {
@@ -6898,9 +6937,8 @@ async function readClaudeRenamedSessionTitle(input: {
   sessionId: string;
   configDir: string;
 }): Promise<string | null> {
-  let content: string;
   try {
-    content = await fsPromises.readFile(await claudeTranscriptPath(input), "utf8");
+    return await readLastClaudeCustomTitle(await claudeTranscriptPath(input));
   } catch (error) {
     // A session with no transcript on disk has no rename to carry over. Every
     // other read failure is a real fault and stays explicit.
@@ -6909,7 +6947,6 @@ async function readClaudeRenamedSessionTitle(input: {
     }
     throw error;
   }
-  return readLastClaudeCustomTitle(content);
 }
 
 function normalizeImportablePromptPreview(text: string): string | null {

packages/server/src/server/agent/providers/pi/agent.test.ts

@@ -5,11 +5,13 @@ import {
   mkdirSync,
   mkdtempSync,
   openSync,
+  readFileSync,
   readSync,
+  realpathSync,
   rmSync,
   writeFileSync,
 } from "node:fs";
-import { tmpdir } from "node:os";
+import { homedir, tmpdir } from "node:os";
 import path from "node:path";
 import pino from "pino";
 import { setImmediate as waitForImmediate } from "node:timers/promises";
@@ -23,6 +25,7 @@ import {
   PiRpcAgentSession,
   transformPiModels,
 } from "./agent.js";
+import { PiCliRuntime } from "./cli-runtime.js";
 import { FakePi } from "./test-utils/fake-pi.js";
 import { createPiExtensionHost } from "./extensions/index.js";
 import { PiExtensionHost } from "./extensions/host.js";
@@ -2719,6 +2722,7 @@ describe("PiRpcAgentClient", () => {
     const root = mkdtempSync(path.join(tmpdir(), "paseo-pi-import-config-"));
     const cwd = path.join(root, "workspace");
     const sessionsDir = path.join(root, "sessions");
+    mkdirSync(cwd, { recursive: true });
     mkdirSync(sessionsDir, { recursive: true });
     const sessionFile = path.join(sessionsDir, "20260103_session.jsonl");
     writeFileSync(
@@ -3532,6 +3536,320 @@ describe("PiRpcAgentClient", () => {
   });
 });
 
+describe("PiRpcAgentClient history resume", () => {
+  const BUILTIN_MCP_COMMAND = {
+    name: "mcp",
+    source: "extension",
+    sourceInfo: { path: "builtin:mcp" },
+  } as const;
+  const PASEO_MCP_SERVERS = {
+    paseo: { type: "http", url: "http://127.0.0.1:6767/mcp/agents" },
+  } as const;
+
+  interface ArchivedPiSession {
+    handle: {
+      provider: string;
+      sessionId: string;
+      nativeHandle: string;
+      metadata: { cwd: string; model?: string };
+    };
+    sessionFile: string;
+    header: Record<string, unknown>;
+    body: string;
+    originalBytes: Buffer;
+  }
+
+  function createDeletedFolder(): string {
+    const folder = mkdtempSync(path.join(tmpdir(), "paseo-pi-deleted-cwd-"));
+    rmSync(folder, { recursive: true, force: true });
+    return folder;
+  }
+
+  function createFileWhereFolderWas(): string {
+    const folder = createDeletedFolder();
+    writeFileSync(folder, "not a directory");
+    onTestFinished(() => rmSync(folder, { force: true }));
+    return folder;
+  }
+
+  function createExistingFolder(): string {
+    const folder = mkdtempSync(path.join(tmpdir(), "paseo-pi-existing-cwd-"));
+    onTestFinished(() => rmSync(folder, { recursive: true, force: true }));
+    return folder;
+  }
+
+  function writeArchivedSession(cwd: string, metadata: { model?: string } = {}): ArchivedPiSession {
+    const dir = mkdtempSync(path.join(tmpdir(), "paseo-pi-archived-session-"));
+    onTestFinished(() => rmSync(dir, { recursive: true, force: true }));
+    const sessionFile = path.join(dir, "2026-01-01_pi-session-1.jsonl");
+    const header = {
+      type: "session",
+      version: 3,
+      id: "pi-session-1",
+      timestamp: "2026-01-01T00:00:00.000Z",
+      cwd,
+    };
+    const body = [
+      JSON.stringify({
+        type: "message",
+        id: "entry-1",
+        parentId: null,
+        message: { role: "user", content: "Où est le café ☕ ?" },
+      }),
+      JSON.stringify({
+        type: "message",
+        id: "entry-2",
+        parentId: "entry-1",
+        message: { role: "assistant", content: [{ type: "text", text: "Dans la cuisine." }] },
+      }),
+    ]
+      .map((line) => `${line}\n`)
+      .join("");
+    writeFileSync(sessionFile, `${JSON.stringify(header)}\n${body}`);
+    return {
+      handle: {
+        provider: "pi",
+        sessionId: "pi-session-1",
+        nativeHandle: sessionFile,
+        metadata: { cwd, ...metadata },
+      },
+      sessionFile,
+      header,
+      body,
+      originalBytes: readFileSync(sessionFile),
+    };
+  }
+
+  function readSessionCopy(sessionFile: string): { header: unknown; body: string } {
+    const content = readUtf8File(sessionFile);
+    const headerEnd = content.indexOf("\n");
+    return {
+      header: JSON.parse(content.slice(0, headerEnd)),
+      body: content.slice(headerEnd + 1),
+    };
+  }
+
+  function resumeArchived(
+    client: PiRpcAgentClient,
+    archived: ArchivedPiSession,
+    purpose: "history" | "interactive",
+    overrides: Partial<AgentSessionConfig> = {},
+  ): Promise<AgentSession> {
+    return client.resumeSession(archived.handle, overrides, undefined, { purpose });
+  }
+
+  function writeFakePiProcess(): {
+    command: [string, ...string[]];
+    readLaunches: () => Array<{ cwd: string; session: string | null }>;
+  } {
+    const dir = mkdtempSync(path.join(tmpdir(), "paseo-pi-process-"));
+    onTestFinished(() => rmSync(dir, { recursive: true, force: true }));
+    const scriptPath = path.join(dir, "fake-pi.cjs");
+    const launchesPath = path.join(dir, "launches.jsonl");
+    writeFileSync(
+      scriptPath,
+      `
+const fs = require("node:fs");
+const readline = require("node:readline");
+const [launchesPath, ...piArgs] = process.argv.slice(2);
+const sessionFlag = piArgs.indexOf("--session");
+const sessionFile = sessionFlag === -1 ? null : piArgs[sessionFlag + 1];
+fs.appendFileSync(launchesPath, JSON.stringify({ cwd: process.cwd(), session: sessionFile }) + "\\n");
+if (sessionFile) {
+  const header = JSON.parse(fs.readFileSync(sessionFile, "utf8").split("\\n", 1)[0]);
+  if (header.cwd && !fs.existsSync(header.cwd)) {
+    fs.writeSync(
+      2,
+      "Stored session working directory does not exist: " + header.cwd + "\\nSession file: " + sessionFile + "\\nCurrent working directory: " + process.cwd() + "\\n",
+    );
+    process.exit(1);
+  }
+}
+const models = [
+  { provider: "openrouter", id: "a" },
+  { provider: "openrouter", id: "b" },
+];
+const state = {
+  sessionId: "pi-session-1",
+  sessionFile,
+  model: models[0],
+  thinkingLevel: "medium",
+  isStreaming: false,
+  isCompacting: false,
+  messageCount: 0,
+  pendingMessageCount: 0,
+};
+const commands = [${JSON.stringify(BUILTIN_MCP_COMMAND)}];
+function handle(request) {
+  switch (request.type) {
+    case "get_state":
+      return state;
+    case "get_commands":
+      return { commands };
+    case "get_available_models":
+      return { models };
+    case "set_model":
+      fs.appendFileSync(
+        sessionFile,
+        JSON.stringify({ type: "model_change", id: "model-1", provider: request.provider, modelId: request.modelId }) + "\\n",
+      );
+      state.model = models.find((model) => model.id === request.modelId);
+      return state.model;
+    default:
+      return {};
+  }
+}
+readline.createInterface({ input: process.stdin }).on("line", (line) => {
+  const request = JSON.parse(line);
+  process.stdout.write(
+    JSON.stringify({ id: request.id, type: "response", command: request.type, success: true, data: handle(request) }) + "\\n",
+  );
+});
+`,
+    );
+    return {
+      command: [process.execPath, scriptPath, launchesPath],
+      readLaunches: () =>
+        readUtf8File(launchesPath)
+          .trim()
+          .split("\n")
+          .map((line) => JSON.parse(line) as { cwd: string; session: string | null }),
+    };
+  }
+
+  test.each([
+    ["is gone", createDeletedFolder],
+    ["is now a file", createFileWhereFolderWas],
+  ])(
+    "a history resume of an agent whose folder %s starts Pi from the home directory on a copy of its session",
+    async (_folderState, createFolder) => {
+      const archived = writeArchivedSession(createFolder());
+      const pi = new FakePi();
+
+      const session = await resumeArchived(createClient(pi), archived, "history");
+      onTestFinished(() => session.close());
+
+      expect(pi.recordedLaunches).toHaveLength(1);
+      const launch = pi.recordedLaunches[0]!;
+      expect(launch.cwd).toBe(homedir());
+      expect(launch.session).not.toBe(archived.sessionFile);
+      expect(readSessionCopy(launch.session!)).toEqual({
+        header: { ...archived.header, cwd: homedir() },
+        body: archived.body,
+      });
+    },
+  );
+
+  test("a history resume of an agent whose folder is gone removes its session copy on close and leaves the original unchanged", async () => {
+    const archived = writeArchivedSession(createDeletedFolder());
+    const pi = new FakePi();
+
+    const session = await resumeArchived(createClient(pi), archived, "history");
+    const sessionCopy = pi.recordedLaunches[0]!.session!;
+    expect(existsSync(sessionCopy)).toBe(true);
+    await session.close();
+
+    expect(existsSync(path.dirname(sessionCopy))).toBe(false);
+    expect(readFileSync(archived.sessionFile)).toEqual(archived.originalBytes);
+  });
+
+  test("a history resume of an agent whose folder is gone persists the original session file while Pi reports the copy", async () => {
+    const storedCwd = createDeletedFolder();
+    const archived = writeArchivedSession(storedCwd);
+    const pi = new FakePi();
+
+    const session = await resumeArchived(createClient(pi), archived, "history");
+    onTestFinished(() => session.close());
+    await session.getRuntimeInfo();
+
+    expect(pi.latestSession().state.sessionFile).toBe(pi.recordedLaunches[0]!.session);
+    expect(session.describePersistence()).toMatchObject({
+      nativeHandle: archived.sessionFile,
+      metadata: { cwd: storedCwd },
+    });
+  });
+
+  test("a history resume of an agent whose folder is gone removes its session copy when Pi fails to start", async () => {
+    const archived = writeArchivedSession(createDeletedFolder());
+    const pi = new FakePi();
+    pi.queueSessionSetup((session) => {
+      session.getStateError = new Error("Pi RPC process exited with code 1 and signal null");
+    });
+
+    await expect(resumeArchived(createClient(pi), archived, "history")).rejects.toThrow(
+      "Pi RPC process exited with code 1",
+    );
+
+    expect(pi.recordedLaunches).toHaveLength(1);
+    expect(pi.recordedLaunches[0]!.session).not.toBe(archived.sessionFile);
+    expect(existsSync(path.dirname(pi.recordedLaunches[0]!.session!))).toBe(false);
+  });
+
+  test("a history resume of an agent whose folder is gone checks MCP support from the home directory", async () => {
+    const archived = writeArchivedSession(createDeletedFolder());
+    const pi = new FakePi();
+    pi.queueCommands([BUILTIN_MCP_COMMAND]);
+
+    const session = await resumeArchived(createClient(pi), archived, "history", {
+      mcpServers: PASEO_MCP_SERVERS,
+    });
+    onTestFinished(() => session.close());
+
+    expect(pi.recordedLaunches.map((launch) => launch.cwd)).toEqual([homedir(), homedir()]);
+    expect(session.capabilities.supportsMcpServers).toBe(true);
+  });
+
+  test("an interactive resume of an agent whose folder is gone still fails in its stored folder", async () => {
+    const storedCwd = createDeletedFolder();
+    const archived = writeArchivedSession(storedCwd);
+    const pi = new FakePi();
+
+    await expect(resumeArchived(createClient(pi), archived, "interactive")).rejects.toThrow(
+      `Stored session working directory does not exist: ${storedCwd}`,
+    );
+
+    expect(pi.recordedLaunches).toMatchObject([{ cwd: storedCwd, session: archived.sessionFile }]);
+  });
+
+  test("a history resume of an agent whose folder exists keeps the stored folder and session file", async () => {
+    const storedCwd = createExistingFolder();
+    const archived = writeArchivedSession(storedCwd);
+    const pi = new FakePi();
+
+    const session = await resumeArchived(createClient(pi), archived, "history");
+    onTestFinished(() => session.close());
+
+    expect(pi.recordedLaunches).toMatchObject([{ cwd: storedCwd, session: archived.sessionFile }]);
+  });
+
+  test("a history resume of an agent whose folder is gone opens its session in a real Pi process started from the home directory", async () => {
+    const archived = writeArchivedSession(createDeletedFolder(), { model: "openrouter/b" });
+    const fakePiProcess = writeFakePiProcess();
+    const logger = pino({ level: "silent" });
+    const client = new PiRpcAgentClient({
+      logger,
+      runtime: new PiCliRuntime({ logger, command: fakePiProcess.command }),
+    });
+
+    const session = await resumeArchived(client, archived, "history", {
+      mcpServers: PASEO_MCP_SERVERS,
+    });
+    onTestFinished(() => session.close());
+
+    const launches = fakePiProcess.readLaunches();
+    const home = realpathSync.native(homedir());
+    expect(launches.map((launch) => realpathSync.native(launch.cwd))).toEqual([home, home]);
+    expect(session.capabilities.supportsMcpServers).toBe(true);
+    const sessionCopy = launches[1]!.session!;
+    expect(readUtf8File(sessionCopy)).toContain('"type":"model_change"');
+    expect(session.describePersistence()?.nativeHandle).toBe(archived.sessionFile);
+
+    await session.close();
+    expect(existsSync(path.dirname(sessionCopy))).toBe(false);
+    expect(readFileSync(archived.sessionFile)).toEqual(archived.originalBytes);
+  });
+});
+
 describe("transformPiModels", () => {
   test("normalizes labels that include the upstream provider prefix", () => {
     expect(

packages/server/src/server/agent/providers/pi/agent.ts

@@ -2,7 +2,7 @@ import { mapCustomMessageToToolCall } from "../custom-message.js";
 import { randomUUID } from "node:crypto";
 import { existsSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
 import { homedir, tmpdir } from "node:os";
-import { join, resolve as resolvePath } from "node:path";
+import { basename, join, resolve as resolvePath } from "node:path";
 import type { Logger } from "pino";
 import stripAnsi from "strip-ansi";
 import { z } from "zod";
@@ -22,6 +22,7 @@ import {
   type AgentPersistenceHandle,
   type AgentPromptInput,
   type AgentProvider,
+  type AgentResumeSessionOptions,
   type AgentRunOptions,
   type AgentRunResult,
   type AgentRuntimeInfo,
@@ -75,8 +76,13 @@ import {
   piExtensionRuntimeBridge,
   type PiExtensionEventOutput,
 } from "./extensions/index.js";
+import { resolveResumeProcessCwd } from "../resume-process-cwd.js";
 import { revertPiConversation } from "./rewind.js";
-import { listPiImportableSessions, readPiImportSessionConfig } from "./session-descriptor.js";
+import {
+  copyPiSessionFileWithCwd,
+  listPiImportableSessions,
+  readPiImportSessionConfig,
+} from "./session-descriptor.js";
 import type { PiRuntime, PiRuntimeSession, PiStartSessionInput } from "./runtime.js";
 import type {
   PiAgentSessionEvent,
@@ -245,6 +251,7 @@ interface PiRpcAgentSessionOptions {
   initialState: PiSessionState;
   capabilities: AgentCapabilityFlags;
   currentModeId?: string | null;
+  persistedSessionFile?: string;
   cleanup?: () => void;
   extensionTimeoutMs?: number;
   logger: Logger;
@@ -492,13 +499,14 @@ function buildResumeConfig(
 
 function buildResumeStartInput(input: {
   resumeConfig: PiResumeConfig;
+  processCwd: string;
   sessionFile: string;
   launchContext: AgentLaunchContext | undefined;
   mcpConfigFile: PiTempFile | null;
   paseoExtension: PiTempFile | null;
 }): PiStartSessionInput {
   return {
-    cwd: input.resumeConfig.cwd,
+    cwd: input.processCwd,
     env: input.launchContext?.env,
     session: input.sessionFile,
     thinkingOptionId: normalizePiThinkingOption(input.resumeConfig.thinkingOptionId) ?? undefined,
@@ -618,6 +626,19 @@ function createPiMcpConfigFile(
   };
 }
 
+async function createPiSessionCopy(sessionFile: string, cwd: string): Promise<PiTempFile> {
+  const dir = mkdtempSync(join(tmpdir(), "paseo-pi-session-"));
+  const cleanup = () => rmSync(dir, { recursive: true, force: true });
+  const filePath = join(dir, basename(sessionFile));
+  try {
+    await copyPiSessionFileWithCwd({ sourceFile: sessionFile, targetFile: filePath, cwd });
+  } catch (error) {
+    cleanup();
+    throw error;
+  }
+  return { path: filePath, cleanup };
+}
+
 function createPiPaseoExtensionFile({
   systemPrompt,
   mcpServers = {},
@@ -1232,6 +1253,7 @@ export class PiRpcAgentSession implements AgentSession {
     this.capabilities = options.capabilities;
     this.provider = PI_PROVIDER;
     this.currentModeId = options.currentModeId ?? null;
+    this.persistedSessionFile = options.persistedSessionFile;
     this.cleanup = options.cleanup;
     this.extensionTimeoutMs = options.extensionTimeoutMs ?? DEFAULT_PI_EXTENSION_RESULT_TIMEOUT_MS;
     this.logger = options.logger;
@@ -1262,6 +1284,7 @@ export class PiRpcAgentSession implements AgentSession {
 
   private readonly runtimeSession: PiRuntimeSession;
   private readonly config: AgentSessionConfig;
+  private readonly persistedSessionFile?: string;
   private readonly cleanup?: () => void;
   private readonly extensionTimeoutMs: number;
 
@@ -1496,7 +1519,7 @@ export class PiRpcAgentSession implements AgentSession {
     return {
       provider: this.provider,
       sessionId: this.state.sessionId,
-      nativeHandle: this.state.sessionFile,
+      nativeHandle: this.persistedSessionFile ?? this.state.sessionFile,
       metadata: {
         cwd: this.config.cwd,
         ...(this.config.model ? { model: this.config.model } : {}),
@@ -2645,6 +2668,7 @@ export class PiRpcAgentClient implements AgentClient {
     handle: AgentPersistenceHandle,
     overrides?: Partial<AgentSessionConfig>,
     launchContext?: AgentLaunchContext,
+    options?: AgentResumeSessionOptions,
   ): Promise<AgentSession> {
     const sessionFile = handle.nativeHandle;
     if (!sessionFile) {
@@ -2653,6 +2677,7 @@ export class PiRpcAgentClient implements AgentClient {
 
     const persistenceMetadata = parsePersistenceMetadata(handle.metadata);
     const resumeConfig = buildResumeConfig(persistenceMetadata, overrides, this.provider);
+    const processCwd = await resolveResumeProcessCwd(resumeConfig.cwd, options?.purpose);
 
     const providerOptions = PiProviderOptionsSchema.parse(
       resumeConfig.config.providerOptions ?? {},
@@ -2663,7 +2688,7 @@ export class PiRpcAgentClient implements AgentClient {
       ...launchContext?.env,
     };
     const mcp = await this.prepareMcpInjection(
-      resumeConfig.cwd,
+      processCwd,
       resumeConfig.config.mcpServers,
       mcpEnv,
       runtime,
@@ -2676,20 +2701,29 @@ export class PiRpcAgentClient implements AgentClient {
       ),
       mcpServers: mcp?.kind === "builtin" ? mcp.servers : undefined,
     });
+    const tempFiles = mcpConfigFile ? [mcpConfigFile, paseoExtension] : [paseoExtension];
+    const cleanupTempFiles = () => {
+      for (const tempFile of tempFiles) tempFile.cleanup();
+    };
+    let sessionCopy: PiTempFile | null = null;
     let runtimeSession: PiRuntimeSession;
     try {
+      if (processCwd !== resumeConfig.cwd) {
+        sessionCopy = await createPiSessionCopy(sessionFile, processCwd);
+        tempFiles.push(sessionCopy);
+      }
       runtimeSession = await runtime.startSession(
         buildResumeStartInput({
           resumeConfig,
-          sessionFile,
+          processCwd,
+          sessionFile: sessionCopy?.path ?? sessionFile,
           launchContext,
           mcpConfigFile,
           paseoExtension,
         }),
       );
     } catch (error) {
-      mcpConfigFile?.cleanup();
-      paseoExtension?.cleanup();
+      cleanupTempFiles();
       throw error;
     }
     try {
@@ -2702,15 +2736,15 @@ export class PiRpcAgentClient implements AgentClient {
         },
         initialState,
         capabilities: capabilitiesForSession(mcp !== null),
-        cleanup: combineCleanup([mcpConfigFile?.cleanup, paseoExtension?.cleanup]),
+        persistedSessionFile: sessionCopy ? sessionFile : undefined,
+        cleanup: cleanupTempFiles,
         extensionTimeoutMs: providerOptions.extensionTimeoutMs,
         logger: this.logger,
         usagePollScheduler: this.usagePollScheduler,
       });
     } catch (error) {
       await runtimeSession.close().catch(() => undefined);
-      mcpConfigFile?.cleanup();
-      paseoExtension?.cleanup();
+      cleanupTempFiles();
       throw error;
     }
   }

packages/server/src/server/agent/providers/pi/session-descriptor.test.ts

@@ -1,9 +1,13 @@
-import { mkdtemp, mkdir, utimes, writeFile } from "node:fs/promises";
+import { mkdtemp, mkdir, readFile, rm, utimes, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import path from "node:path";
-import { expect, test } from "vitest";
+import { expect, onTestFinished, test } from "vitest";
 
-import { listPiImportableSessions, readPiImportSessionConfig } from "./session-descriptor.js";
+import {
+  copyPiSessionFileWithCwd,
+  listPiImportableSessions,
+  readPiImportSessionConfig,
+} from "./session-descriptor.js";
 
 async function writeSession(root: string, lines: unknown[]): Promise<string> {
   const sessionsDir = path.join(root, "sessions", "project");
@@ -216,3 +220,97 @@ test("Pi import config preserves thinking before a later model in large sessions
     thinkingOptionId: "low",
   });
 });
+
+test("a Pi session copy names the new cwd in its header and keeps every later byte", async () => {
+  const root = await mkdtemp(path.join(tmpdir(), "paseo-pi-session-copy-"));
+  onTestFinished(() => rm(root, { recursive: true, force: true }));
+  const header = {
+    type: "session",
+    version: 3,
+    id: "pi-session-1",
+    timestamp: "2026-01-01T00:00:00.000Z",
+    cwd: path.join(root, "removed-worktree"),
+  };
+  const body = Buffer.from(
+    Array.from(
+      { length: 2_000 },
+      (_, index) =>
+        `${JSON.stringify({ type: "message", id: `entry-${index}`, message: { role: "user", content: `café ☕ ${index}` } })}\n`,
+    ).join(""),
+  );
+  expect(body.length).toBeGreaterThan(64 * 1024);
+  const sourceFile = path.join(root, "source.jsonl");
+  const targetFile = path.join(root, "copy.jsonl");
+  await writeFile(sourceFile, Buffer.concat([Buffer.from(`${JSON.stringify(header)}\n`), body]));
+
+  await copyPiSessionFileWithCwd({ sourceFile, targetFile, cwd: "/home/user" });
+
+  const copy = await readFile(targetFile);
+  const headerEnd = copy.indexOf(0x0a);
+  expect(JSON.parse(copy.subarray(0, headerEnd).toString("utf8"))).toEqual({
+    ...header,
+    cwd: "/home/user",
+  });
+  expect(copy.subarray(headerEnd + 1).equals(body)).toBe(true);
+});
+
+test("a Pi session copy refuses a file without a session header", async () => {
+  const root = await mkdtemp(path.join(tmpdir(), "paseo-pi-session-copy-"));
+  onTestFinished(() => rm(root, { recursive: true, force: true }));
+  const sourceFile = path.join(root, "source.jsonl");
+  await writeFile(sourceFile, `${JSON.stringify({ type: "message", id: "entry-1" })}\n`);
+
+  await expect(
+    copyPiSessionFileWithCwd({ sourceFile, targetFile: path.join(root, "copy.jsonl"), cwd: "/" }),
+  ).rejects.toThrow(`Pi session file has no session header: ${sourceFile}`);
+});
+
+const COPY_BODY = [
+  { type: "message", id: "entry-1", message: { role: "user", content: "café ☕" } },
+  { type: "message", id: "entry-2", message: { role: "assistant", content: "Dans la cuisine." } },
+]
+  .map((entry) => `${JSON.stringify(entry)}\n`)
+  .join("");
+
+const COPY_HEADER = {
+  type: "session",
+  version: 3,
+  id: "pi-session-1",
+  timestamp: "2026-01-01T00:00:00.000Z",
+  cwd: "/removed-worktree",
+};
+
+async function copySessionContent(content: string): Promise<Buffer> {
+  const root = await mkdtemp(path.join(tmpdir(), "paseo-pi-session-copy-"));
+  onTestFinished(() => rm(root, { recursive: true, force: true }));
+  const sourceFile = path.join(root, "source.jsonl");
+  const targetFile = path.join(root, "copy.jsonl");
+  await writeFile(sourceFile, content);
+  await copyPiSessionFileWithCwd({ sourceFile, targetFile, cwd: "/home/user" });
+  return readFile(targetFile);
+}
+
+test.each([
+  ["a header line longer than 64 KiB", "", { ...COPY_HEADER, padding: "x".repeat(70 * 1024) }],
+  ["a header with an empty cwd", "", { ...COPY_HEADER, cwd: "" }],
+  ["blank lines before the header", "\n\r\n", COPY_HEADER],
+])("a Pi session copy accepts %s", async (_headerShape, prefix, header) => {
+  const copy = await copySessionContent(`${prefix}${JSON.stringify(header)}\n${COPY_BODY}`);
+
+  const headerEnd = copy.indexOf(0x0a);
+  expect(JSON.parse(copy.subarray(0, headerEnd).toString("utf8"))).toEqual({
+    ...header,
+    cwd: "/home/user",
+  });
+  expect(copy.subarray(headerEnd + 1).equals(Buffer.from(COPY_BODY))).toBe(true);
+});
+
+test("a Pi session copy reports a missing session file", async () => {
+  const root = await mkdtemp(path.join(tmpdir(), "paseo-pi-session-copy-"));
+  onTestFinished(() => rm(root, { recursive: true, force: true }));
+  const sourceFile = path.join(root, "missing.jsonl");
+
+  await expect(
+    copyPiSessionFileWithCwd({ sourceFile, targetFile: path.join(root, "copy.jsonl"), cwd: "/" }),
+  ).rejects.toThrow(`Pi session file is missing: ${sourceFile}`);
+});

packages/server/src/server/agent/providers/pi/session-descriptor.ts

@@ -1,7 +1,8 @@
-import type { Dirent } from "node:fs";
-import { open, readdir, readFile, stat } from "node:fs/promises";
+import { createReadStream, createWriteStream, type Dirent } from "node:fs";
+import { open, readdir, readFile, stat, writeFile } from "node:fs/promises";
 import { homedir } from "node:os";
 import path from "node:path";
+import { pipeline } from "node:stream/promises";
 
 import type {
   ImportableProviderSession,
@@ -18,6 +19,7 @@ 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;
+const PI_SESSION_HEADER_SCAN_BYTES = 1024 * 1024;
 // Rank all discovered files cheaply, then parse only a bounded recent window.
 const IMPORT_CANDIDATE_OVERSCAN = 40;
 const IMPORT_CANDIDATE_MIN = 400;
@@ -100,6 +102,59 @@ export async function listPiImportableSessions(
   );
 }
 
+export async function copyPiSessionFileWithCwd(input: {
+  sourceFile: string;
+  targetFile: string;
+  cwd: string;
+}): Promise<void> {
+  const found = findSessionHeaderLine(
+    await readSessionFileStart(input.sourceFile, PI_SESSION_HEADER_SCAN_BYTES),
+  );
+  if (!found) {
+    throw new Error(`Pi session file has no session header: ${input.sourceFile}`);
+  }
+  await writeFile(input.targetFile, `${JSON.stringify({ ...found.header, cwd: input.cwd })}\n`, {
+    mode: 0o600,
+  });
+  await pipeline(
+    createReadStream(input.sourceFile, { start: found.bodyStart }),
+    createWriteStream(input.targetFile, { flags: "a" }),
+  );
+}
+
+function findSessionHeaderLine(
+  scanned: Buffer,
+): { header: Record<string, unknown>; bodyStart: number } | null {
+  let lineStart = 0;
+  while (lineStart < scanned.length) {
+    const newline = scanned.indexOf(0x0a, lineStart);
+    const bodyStart = newline === -1 ? scanned.length : newline + 1;
+    const line = scanned.subarray(lineStart, bodyStart).toString("utf8").trim();
+    if (line) {
+      const header = parseJsonRecord(line);
+      return header?.type === "session" ? { header, bodyStart } : null;
+    }
+    lineStart = bodyStart;
+  }
+  return null;
+}
+
+async function readSessionFileStart(filePath: string, maxBytes: number): Promise<Buffer> {
+  const handle = await open(filePath, "r").catch((error: unknown) => {
+    if ((error as NodeJS.ErrnoException).code === "ENOENT") {
+      throw new Error(`Pi session file is missing: ${filePath}`);
+    }
+    throw error;
+  });
+  try {
+    const buffer = Buffer.alloc(maxBytes);
+    const { bytesRead } = await handle.read(buffer, 0, maxBytes, 0);
+    return buffer.subarray(0, bytesRead);
+  } finally {
+    await handle.close().catch(() => undefined);
+  }
+}
+
 export async function readPiImportSessionConfig(filePath: string): Promise<PiImportSessionConfig> {
   const descriptor = await readPiSessionDescriptor(filePath);
   if (!descriptor) return {};

packages/server/src/server/agent/providers/pi/test-utils/fake-pi.ts

@@ -1,3 +1,5 @@
+import { existsSync, readFileSync } from "node:fs";
+
 import type {
   PiRuntime,
   PiRuntimeLaunch,
@@ -75,6 +77,12 @@ export class FakePi implements PiRuntime {
     const session = new FakePiSession(launch, this.removedModels);
     session.commands = this.queuedCommands.shift() ?? [];
     this.queuedSessionSetups.shift()?.(session);
+    const missingSessionCwd = launch.noSession ? null : readMissingSessionCwd(launch.session);
+    if (missingSessionCwd !== null) {
+      session.getStateError = new Error(
+        `Pi RPC process exited with code 1 and signal null\nStored session working directory does not exist: ${missingSessionCwd}\nSession file: ${launch.session}\nCurrent working directory: ${launch.cwd}`,
+      );
+    }
     this.sessions.push(session);
     return session;
   }
@@ -101,6 +109,27 @@ export class FakePi implements PiRuntime {
   }
 }
 
+function readMissingSessionCwd(sessionFile: string | undefined): string | null {
+  if (!sessionFile || !existsSync(sessionFile)) {
+    return null;
+  }
+  const [headerLine = ""] = readFileSync(sessionFile, "utf8").split("\n", 1);
+  let header: unknown;
+  try {
+    header = JSON.parse(headerLine);
+  } catch {
+    return null;
+  }
+  if (typeof header !== "object" || header === null || !("cwd" in header)) {
+    return null;
+  }
+  const { type, cwd } = header as { type?: unknown; cwd?: unknown };
+  if (type !== "session" || typeof cwd !== "string" || !cwd || existsSync(cwd)) {
+    return null;
+  }
+  return cwd;
+}
+
 export class FakePiSession implements PiRuntimeSession {
   readonly environment: Record<string, string>;
   readonly prompts: Array<{ message: string; imageCount: number }> = [];

packages/server/src/server/agent/providers/resume-process-cwd.ts

@@ -0,0 +1,26 @@
+import { stat } from "node:fs/promises";
+import { homedir } from "node:os";
+
+import type { AgentResumePurpose } from "../agent-sdk-types.js";
+
+export async function resolveResumeProcessCwd(
+  cwd: string,
+  purpose: AgentResumePurpose | undefined,
+): Promise<string> {
+  if (purpose !== "history" || (await isDirectory(cwd))) {
+    return cwd;
+  }
+  return homedir();
+}
+
+async function isDirectory(target: string): Promise<boolean> {
+  try {
+    return (await stat(target)).isDirectory();
+  } catch (error) {
+    const code = (error as NodeJS.ErrnoException).code;
+    if (code === "ENOENT" || code === "ENOTDIR") {
+      return false;
+    }
+    throw error;
+  }
+}

packages/server/src/server/bootstrap.smoke.test.ts

@@ -670,11 +670,11 @@ describe("paseo daemon bootstrap", () => {
 
   test("rolls back standalone listener without starting plugins when main listen fails", async () => {
     const mainPort = await findFreePort();
-    const standalonePort = await findFreePort();
     const occupiedMain = http.createServer((_req, res) => {
       res.end("occupied-main");
     });
     await new Promise<void>((resolve) => occupiedMain.listen(mainPort, "127.0.0.1", resolve));
+    const standalonePort = await findFreePort();
 
     const paseoHomeRoot = await mkdtemp(path.join(os.tmpdir(), "paseo-main-rollback-"));
     const paseoHome = path.join(paseoHomeRoot, ".paseo");

packages/server/src/server/plugins/managed-source.posix.test.ts

@@ -61,10 +61,24 @@ describe("managed Git plugin sources", () => {
     roots.push(home);
     const sources = new ManagedPluginSources(home);
 
-    const failure = sources.prepareInstall({
-      source: "git:https://oauth2:super-secret@127.0.0.1:1/missing.git",
+    // Own the failure response instead of relying on a closed port and OS connect timing.
+    const server = createServer((_request, response) => {
+      response.writeHead(500, { "Content-Type": "text/plain" });
+      response.end("clone rejected for oauth2:super-secret\n");
     });
-    await expect(failure).rejects.not.toThrow(/oauth2|super-secret/);
+    await new Promise<void>((resolve) => server.listen(0, "127.0.0.1", resolve));
+    const address = server.address() as { port: number };
+    try {
+      const failure = sources.prepareInstall({
+        source: `git:http://oauth2:super-secret@127.0.0.1:${address.port}/missing.git`,
+      });
+      await expect(failure).rejects.toThrow("500");
+      await expect(failure).rejects.toThrow("clone rejected for [redacted]:[redacted]");
+      await expect(failure).rejects.not.toThrow(/oauth2|super-secret/);
+    } finally {
+      server.closeAllConnections();
+      await new Promise<void>((resolve) => server.close(() => resolve()));
+    }
   });
 
   it("normalizes explicit GitHub and Git identifiers to the same Git source", async () => {

packages/server/src/server/service-proxy.test.ts

@@ -1,7 +1,9 @@
+import { type EventEmitter, once } from "node:events";
 import { readdirSync, readFileSync, statSync } from "node:fs";
 import path from "node:path";
 import http from "node:http";
 import net from "node:net";
+import type { Duplex } from "node:stream";
 import express from "express";
 import { describe, expect, it } from "vitest";
 import pino from "pino";
@@ -332,48 +334,39 @@ describe("service proxy subsystem shape", () => {
   });
 });
 
-interface ForwardedFixture {
+interface ProxiedServiceFixture {
   upstreamPort: number;
   daemonPort: number;
+  daemon: http.Server;
   hostname: string;
   close(): Promise<void>;
 }
 
 /**
- * Runs a real workspace service behind a real daemon listener. The upstream
- * echoes the headers it received so tests can assert what actually crossed the
- * proxy, not what a helper returned.
+ * Runs a real workspace service behind a real daemon listener that serves the
+ * service proxy for both HTTP and upgrades.
  */
-async function startForwardedHeadersFixture(upstreamHost = "127.0.0.1"): Promise<ForwardedFixture> {
-  const upstream = http.createServer((req, res) => {
-    let body = "";
-    req.on("data", (chunk: Buffer) => {
-      body += chunk.toString();
+async function startProxiedService(
+  upstream: http.Server,
+  options: { upstreamHost?: string; logger?: pino.Logger } = {},
+): Promise<ProxiedServiceFixture> {
+  const { upstreamHost = "127.0.0.1", logger: proxyLogger = logger } = options;
+  // Upgraded sockets keep the server alive; close() alone would hang.
+  const sockets = new Set<net.Socket>();
+  function trackConnections(server: http.Server) {
+    server.on("connection", (socket: net.Socket) => {
+      sockets.add(socket);
+      socket.once("close", () => sockets.delete(socket));
     });
-    req.on("end", () => {
-      res.writeHead(200, { "content-type": "application/json" });
-      res.end(JSON.stringify({ ...req.headers, method: req.method, url: req.url, body }));
-    });
-  });
-  const upgradeSockets: net.Socket[] = [];
-  upstream.on("upgrade", (req, socket) => {
-    upgradeSockets.push(socket);
-    // The client resets this connection once it has the echo, so the reset
-    // reaches us as an 'error'. A raw upgrade socket has no default handler —
-    // without this the event goes unhandled and takes down the test process.
-    socket.on("error", () => socket.destroy());
-    const payload = JSON.stringify(req.headers);
-    socket.write(
-      `HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nX-Echo-Length: ${payload.length}\r\n\r\n${payload}`,
-    );
-  });
+  }
+  trackConnections(upstream);
   await new Promise<void>((resolve, reject) => {
     upstream.once("error", reject);
     upstream.listen(0, upstreamHost, resolve);
   });
   const upstreamPort = (upstream.address() as net.AddressInfo).port;
 
-  const serviceProxy = createServiceProxySubsystem({ logger });
+  const serviceProxy = createServiceProxySubsystem({ logger: proxyLogger });
   const route = serviceProxy.registerWorkspaceService({
     workspaceId: "workspace-a",
     projectSlug: "repo",
@@ -390,24 +383,51 @@ async function startForwardedHeadersFixture(upstreamHost = "127.0.0.1"): Promise
     res.status(404).send("404 Not Found");
   });
   const daemon = http.createServer(app);
+  trackConnections(daemon);
   daemon.on("upgrade", serviceProxy.upgradeHandler({ passthroughUnknown: false }));
   await new Promise<void>((resolve) => daemon.listen(daemonPort, "127.0.0.1", resolve));
 
   return {
     upstreamPort,
     daemonPort,
+    daemon,
     hostname: route.hostname,
     async close() {
-      // Upgraded sockets keep the server alive; close() alone would hang.
-      for (const socket of upgradeSockets) socket.destroy();
-      daemon.closeAllConnections();
+      for (const socket of sockets) socket.destroy();
       await new Promise<void>((resolve) => daemon.close(() => resolve()));
-      upstream.closeAllConnections();
       await new Promise<void>((resolve) => upstream.close(() => resolve()));
     },
   };
 }
 
+/**
+ * The upstream echoes the headers it received so tests can assert what
+ * actually crossed the proxy, not what a helper returned.
+ */
+function startForwardedHeadersFixture(upstreamHost = "127.0.0.1"): Promise<ProxiedServiceFixture> {
+  const upstream = http.createServer((req, res) => {
+    let body = "";
+    req.on("data", (chunk: Buffer) => {
+      body += chunk.toString();
+    });
+    req.on("end", () => {
+      res.writeHead(200, { "content-type": "application/json" });
+      res.end(JSON.stringify({ ...req.headers, method: req.method, url: req.url, body }));
+    });
+  });
+  upstream.on("upgrade", (req, socket) => {
+    // The client resets this connection once it has the echo, so the reset
+    // reaches us as an 'error'. A raw upgrade socket has no default handler —
+    // without this the event goes unhandled and takes down the test process.
+    socket.on("error", () => socket.destroy());
+    const payload = JSON.stringify(req.headers);
+    socket.write(
+      `HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nX-Echo-Length: ${payload.length}\r\n\r\n${payload}`,
+    );
+  });
+  return startProxiedService(upstream, { upstreamHost });
+}
+
 function upgradeThroughProxy(
   port: number,
   host: string,
@@ -651,3 +671,198 @@ describe("service proxy forwarded headers", () => {
     }
   });
 });
+
+function closed(emitter: EventEmitter): Promise<void> {
+  return new Promise((resolve) => {
+    emitter.once("close", () => resolve());
+  });
+}
+
+async function within<T>(promise: Promise<T>, ms: number, failure: string): Promise<T> {
+  let timer: NodeJS.Timeout | undefined;
+  const timeout = new Promise<never>((_resolve, reject) => {
+    timer = setTimeout(() => reject(new Error(`${failure} after ${ms}ms`)), ms);
+  });
+  try {
+    return await Promise.race([promise, timeout]);
+  } finally {
+    clearTimeout(timer);
+  }
+}
+
+function requestThroughProxy(
+  fixture: ProxiedServiceFixture,
+  requestPath: string,
+): http.ClientRequest {
+  return http.get({
+    hostname: "127.0.0.1",
+    port: fixture.daemonPort,
+    path: requestPath,
+    headers: { host: fixture.hostname },
+  });
+}
+
+const STRAY_WARNING_GRACE_MS = 100;
+
+function createUpgradeUpstream(onUpgrade: (socket: Duplex) => void): http.Server {
+  const upstream = http.createServer();
+  upstream.on("upgrade", (_req, socket) => {
+    socket.on("error", () => socket.destroy());
+    socket.on("end", () => socket.end());
+    socket.write(
+      "HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\n\r\n",
+    );
+    onUpgrade(socket);
+  });
+  return upstream;
+}
+
+function openUpgradeThroughProxy(fixture: ProxiedServiceFixture): Promise<net.Socket> {
+  return new Promise((resolve, reject) => {
+    const socket = net.connect({ host: "127.0.0.1", port: fixture.daemonPort }, () => {
+      const lines = [
+        "GET /ws HTTP/1.1",
+        `Host: ${fixture.hostname}`,
+        "Upgrade: websocket",
+        "Connection: Upgrade",
+        "",
+        "",
+      ];
+      socket.write(lines.join("\r\n"));
+    });
+    let raw = "";
+    socket.on("data", (chunk: Buffer) => {
+      raw += chunk.toString();
+      if (raw.includes("\r\n\r\n")) resolve(socket);
+    });
+    socket.on("close", () => reject(new Error("upgrade closed before the 101 arrived")));
+    socket.on("error", reject);
+  });
+}
+
+describe("service proxy connection teardown", () => {
+  it("closes the upstream connection when a client leaves an event stream", async () => {
+    const upstreamResponse = Promise.withResolvers<http.ServerResponse>();
+    const upstream = http.createServer((_req, res) => {
+      res.writeHead(200, { "content-type": "text/event-stream" });
+      res.write("data: open\n\n");
+      upstreamResponse.resolve(res);
+    });
+    const fixture = await startProxiedService(upstream);
+    try {
+      const request = requestThroughProxy(fixture, "/events");
+      const [response] = (await once(request, "response")) as [http.IncomingMessage];
+      await once(response, "data");
+      const upstreamClosed = closed(await upstreamResponse.promise);
+
+      request.destroy();
+
+      await within(upstreamClosed, 1000, "the service still holds the event stream");
+    } finally {
+      await fixture.close();
+    }
+  }, 5000);
+
+  it("aborts the upstream request when a client leaves before the response starts", async () => {
+    const warnings: unknown[] = [];
+    const proxyLogger = pino(
+      { level: "warn" },
+      { write: (line: string) => warnings.push(JSON.parse(line)) },
+    );
+    const upstreamResponse = Promise.withResolvers<http.ServerResponse>();
+    const upstream = http.createServer((_req, res) => {
+      upstreamResponse.resolve(res);
+    });
+    const fixture = await startProxiedService(upstream, { logger: proxyLogger });
+    try {
+      const request = requestThroughProxy(fixture, "/slow");
+      request.on("error", () => undefined);
+      const upstreamClosed = closed(await upstreamResponse.promise);
+
+      request.destroy();
+
+      await within(upstreamClosed, 1000, "the service still holds the abandoned request");
+      await new Promise((resolve) => setTimeout(resolve, STRAY_WARNING_GRACE_MS));
+      expect(warnings).toEqual([]);
+    } finally {
+      await fixture.close();
+    }
+  }, 5000);
+
+  it("lets a complete response finish without resetting the service", async () => {
+    const upstreamResponse = Promise.withResolvers<http.ServerResponse>();
+    const upstream = http.createServer((_req, res) => {
+      res.writeHead(200, { "content-type": "text/plain" });
+      res.write("first;");
+      upstreamResponse.resolve(res);
+    });
+    const fixture = await startProxiedService(upstream);
+    try {
+      const response = httpGet(fixture.daemonPort, fixture.hostname, { path: "/" });
+      const res = await upstreamResponse.promise;
+      const upstreamClosed = closed(res);
+
+      res.end("second");
+
+      await expect(response).resolves.toEqual({ status: 200, body: "first;second" });
+      await within(upstreamClosed, 1000, "the service response never closed");
+      expect(res.writableFinished).toBe(true);
+    } finally {
+      await fixture.close();
+    }
+  }, 5000);
+
+  it("closes the upstream WebSocket when the daemon drops the client socket", async () => {
+    const upstreamSocket = Promise.withResolvers<Duplex>();
+    const fixture = await startProxiedService(
+      createUpgradeUpstream((socket) => upstreamSocket.resolve(socket)),
+    );
+    const daemonSide = Promise.withResolvers<Duplex>();
+    fixture.daemon.on("upgrade", (_req, socket) => daemonSide.resolve(socket));
+    try {
+      const client = await openUpgradeThroughProxy(fixture);
+      const upstreamClosed = closed(await upstreamSocket.promise);
+
+      (await daemonSide.promise).destroy();
+
+      await within(upstreamClosed, 1000, "the service still holds the WebSocket");
+      client.destroy();
+    } finally {
+      await fixture.close();
+    }
+  }, 5000);
+
+  it("closes the upstream WebSocket when the client disconnects", async () => {
+    const upstreamSocket = Promise.withResolvers<Duplex>();
+    const fixture = await startProxiedService(
+      createUpgradeUpstream((socket) => upstreamSocket.resolve(socket)),
+    );
+    try {
+      const client = await openUpgradeThroughProxy(fixture);
+      const upstreamClosed = closed(await upstreamSocket.promise);
+
+      client.destroy();
+
+      await within(upstreamClosed, 1000, "the service still holds the WebSocket");
+    } finally {
+      await fixture.close();
+    }
+  }, 5000);
+
+  it("closes the client WebSocket when the service closes it", async () => {
+    const upstreamSocket = Promise.withResolvers<Duplex>();
+    const fixture = await startProxiedService(
+      createUpgradeUpstream((socket) => upstreamSocket.resolve(socket)),
+    );
+    try {
+      const client = await openUpgradeThroughProxy(fixture);
+      const clientClosed = closed(client);
+
+      (await upstreamSocket.promise).destroy();
+
+      await within(clientClosed, 1000, "the client WebSocket is still open");
+    } finally {
+      await fixture.close();
+    }
+  }, 5000);
+});

packages/server/src/server/service-proxy.ts

@@ -342,7 +342,14 @@ function proxyHttpRequest({
       proxyRes.pipe(res, { end: true });
     },
   );
+  let clientClosed = false;
+  res.on("close", () => {
+    if (res.writableFinished) return;
+    clientClosed = true;
+    proxyReq.destroy();
+  });
   proxyReq.on("error", (err) => {
+    if (clientClosed) return;
     logger.warn(
       { err, hostname: route.hostname, port: route.port },
       "Service proxy: upstream unreachable",
@@ -399,6 +406,9 @@ function proxyUpgradeRequest({
   socket.on("error", () => {
     targetSocket.destroy();
   });
+  socket.on("close", () => {
+    targetSocket.destroy();
+  });
 }
 
 function sameRouteOwner(left: ServiceProxyRouteEntry, right: ServiceProxyRouteEntry): boolean {

packages/server/src/server/terminal-activity-route.test.ts

@@ -95,7 +95,13 @@ it("accepts terminalId and token reports through the route into the tracker", as
     command: process.execPath,
     args: [
       "-e",
-      `require("node:fs").writeFileSync(${JSON.stringify(envPath)}, JSON.stringify({ terminalId: process.env.PASEO_TERMINAL_ID, token: process.env.PASEO_ACTIVITY_TOKEN, url: process.env.PASEO_TERMINAL_ACTIVITY_URL })); setInterval(() => {}, 1000);`,
+      `
+        const fs = require("node:fs");
+        const envPath = ${JSON.stringify(envPath)};
+        fs.writeFileSync(envPath + ".tmp", JSON.stringify({ terminalId: process.env.PASEO_TERMINAL_ID, token: process.env.PASEO_ACTIVITY_TOKEN, url: process.env.PASEO_TERMINAL_ACTIVITY_URL }));
+        fs.renameSync(envPath + ".tmp", envPath);
+        setInterval(() => {}, 1000);
+      `,
     ],
   });
   await waitForCondition(() => existsSync(envPath), 10000);

packages/server/src/terminal/terminal.test.ts

@@ -410,7 +410,12 @@ describe("createTerminal", () => {
           cwd: realpathSync(tmpdir()),
           cols: 500,
           command: process.execPath,
-          args: ["-e", "process.stdout.write(JSON.stringify(process.argv.slice(1)))", nastyPrompt],
+          // Keep the PTY alive until the screen assertion; exit disposes its parser.
+          args: [
+            "-e",
+            "process.stdout.write(JSON.stringify(process.argv.slice(1))); setInterval(() => {}, 100000)",
+            nastyPrompt,
+          ],
         }),
       );
 

packages/website/src/docs.ts

@@ -186,7 +186,13 @@ function insertDocByPath(nodes: DocsNavNode[], doc: Doc, stripTopDirectory = fal
 
   // A section's top-level directory and its category name the same thing, so
   // only directories below it become collapsible groups.
-  if (stripTopDirectory) directories.shift();
+  if (
+    stripTopDirectory &&
+    directories[0] &&
+    doc.frontmatter.category?.toLowerCase().endsWith(directories[0].toLowerCase())
+  ) {
+    directories.shift();
+  }
 
   let current = nodes;
   let parent: Extract<DocsNavNode, { type: "group" }> | undefined;

packages/website/src/plugin-docs-navigation.test.ts

@@ -2,6 +2,25 @@ import { describe, expect, it } from "vitest";
 import { buildDocsNavTree, getDoc, getDocs, getLegacyDocsRedirect, parseHeadings } from "./docs";
 
 describe("plugin documentation", () => {
+  it.each(["en", "zh-CN"] as const)(
+    "nests local file copying under Git worktrees in %s",
+    (locale) => {
+      const workspaces = buildDocsNavTree(getDocs(locale)).find(
+        (node) => node.type === "category" && node.label === "Workspaces",
+      );
+      expect(workspaces).toMatchObject({
+        children: expect.arrayContaining([
+          expect.objectContaining({
+            type: "group",
+            href: "/docs/worktrees",
+            children: [expect.objectContaining({ href: "/docs/worktrees/worktreeinclude" })],
+          }),
+        ]),
+      });
+      expect(getDoc("worktrees/worktreeinclude", locale)).toBeDefined();
+    },
+  );
+
   it("groups current guides by task without version navigation", () => {
     const plugins = buildDocsNavTree(getDocs("en")).find(
       (node) => node.type === "category" && node.label === "Plugins",

packages/website/src/schedule-docs.test.ts

@@ -4,7 +4,7 @@ import { expect, it } from "vitest";
 
 const docsRoot = path.resolve(import.meta.dirname, "../../../public-docs");
 
-it.each(["schedules.md", "schedules-cli.md", "mcp.md", "worktrees.md"])(
+it.each(["schedules.md", "schedules-cli.md", "mcp.md", "worktrees/index.md"])(
   "%s makes schedule run retention discoverable",
   async (file) => {
     const markdown = await readFile(path.join(docsRoot, file), "utf8");

public-docs/worktrees/index.md

@@ -84,16 +84,7 @@ Add `--forge <name>` when Paseo cannot infer the forge from the source checkout.
 
 ## Copy local files with .worktreeinclude
 
-Create `.worktreeinclude` at the root of your source checkout to copy selected gitignored files into new worktrees:
-
-```gitignore
-.env
-config/*.local.json
-```
-
-Patterns use gitignore syntax. A file must match `.worktreeinclude` and be gitignored to be copied. Tracked files are never copied, and existing destination files are never overwritten. Without `.worktreeinclude`, no local files are copied. Symlinked directories and nested repositories inside an included path cause the copy to fail and abort worktree creation.
-
-The built-in `worktree-include` plugin copies from the checkout you create the worktree from, including when that checkout is another worktree. Copying finishes before setup, terminals, and the first agent. A copy failure aborts creation and removes the new worktree. Copies use copy-on-write clones on APFS and btrfs when supported, with a regular copy elsewhere.
+Use [`.worktreeinclude`](/docs/worktrees/worktreeinclude) to copy selected gitignored files, such as `.env`, from your source checkout before setup runs.
 
 ## paseo.json
 

public-docs/worktrees/index.zh-CN.md

@@ -82,16 +82,7 @@ paseo workspace create \
 
 ## 使用 .worktreeinclude 复制本地文件 {#copy-local-files-with-worktreeinclude}
 
-在源检出的根目录创建 `.worktreeinclude`，将选定的 Git 忽略文件复制到新的 worktree：
-
-```gitignore
-.env
-config/*.local.json
-```
-
-模式使用 gitignore 语法。只有同时匹配 `.worktreeinclude` 且被 Git 忽略的文件才会复制。已跟踪的文件不会被复制，目标中已存在的文件不会被覆盖。没有 `.worktreeinclude` 时，不会复制任何本地文件。包含路径中的符号链接目录和嵌套仓库会导致复制失败，并中止 worktree 创建。
-
-内置的 `worktree-include` 插件从你创建 worktree 时所选的检出复制文件，即使源检出本身也是 worktree。复制会在 setup、终端和第一个 Agent 运行之前完成。复制失败会中止创建并删除新的 worktree。支持时会在 APFS 和 btrfs 上使用写时复制克隆，否则执行普通复制。
+使用 [`.worktreeinclude`](/docs/worktrees/worktreeinclude)，在 setup 运行前将 `.env` 等选定的 Git 忽略文件从源检出复制到新 worktree。
 
 ## paseo.json {#paseojson}
 

public-docs/worktrees/worktreeinclude.md

@@ -0,0 +1,61 @@
+---
+title: .worktreeinclude
+description: Copy gitignored local files into new Paseo worktrees.
+nav: .worktreeinclude
+order: 12
+category: Workspaces
+---
+
+# .worktreeinclude
+
+Add `.worktreeinclude` at the root of your source checkout to copy local configuration into new [Git worktrees](/docs/worktrees). Paseo copies matching gitignored files before setup, terminals, and the first Agent start.
+
+## Copy your local configuration
+
+For a project whose `.gitignore` includes `.env` and `config/*.local.json`, create this `.worktreeinclude`:
+
+```gitignore
+.env
+config/*.local.json
+```
+
+When you create a worktree through Paseo, an existing `.env` and matching files such as `config/dev.local.json` are copied to the same relative paths in the new worktree. Their contents stay out of Git.
+
+Commit `.worktreeinclude` to share the patterns with your team. Each teammate supplies their own ignored files in the checkout they create worktrees from.
+
+## Pattern syntax
+
+Use gitignore syntax, with one pattern per line. Comments start with `#`. Prefix a pattern with `!` to exclude a match:
+
+```gitignore
+# Local environment and configuration
+.env
+config/*.local.json
+!config/production.local.json
+```
+
+A pattern only selects files that Git already ignores. Adding a path here does not ignore it, so also configure `.gitignore` when needed. Tracked files and untracked files that Git does not ignore are excluded.
+
+## When files are copied
+
+The built-in `worktree-include` plugin reads the file from the checkout you create the worktree from. That source can itself be another worktree. Keep the plugin enabled for copying to run.
+
+- Without `.worktreeinclude`, the plugin copies nothing.
+- Matching files must exist in the source checkout.
+- Existing destination files are skipped, preserving their contents.
+- Copies happen during creation, with no ongoing synchronization between checkouts.
+- A copy error aborts creation and removes the new worktree. Avoid including symlinked directories or nested repositories, which cannot be copied as files.
+
+## Run commands during setup
+
+Use `.worktreeinclude` for files that already exist locally. Use a [setup hook](/docs/worktrees#setup-and-teardown) to install dependencies, generate files, or fetch secrets:
+
+```json
+{
+  "worktree": {
+    "setup": "npm ci"
+  }
+}
+```
+
+Put this configuration in `paseo.json` on the base branch used for the new worktree. Copied files are available when setup runs.

public-docs/worktrees/worktreeinclude.zh-CN.md

@@ -0,0 +1,61 @@
+---
+title: .worktreeinclude
+description: 将 Git 忽略的本地文件复制到新的 Paseo worktree。
+nav: .worktreeinclude
+order: 12
+category: Workspaces
+---
+
+# .worktreeinclude
+
+在源检出的根目录添加 `.worktreeinclude`，将本地配置复制到新的 [Git worktree](/docs/worktrees)。Paseo 会在 setup、终端和首个 Agent 启动之前复制匹配的 Git 忽略文件。
+
+## 复制本地配置 {#copy-your-local-configuration}
+
+如果项目的 `.gitignore` 包含 `.env` 和 `config/*.local.json`，创建以下 `.worktreeinclude`：
+
+```gitignore
+.env
+config/*.local.json
+```
+
+通过 Paseo 创建 worktree 时，已有的 `.env` 和 `config/dev.local.json` 等匹配文件会被复制到新 worktree 中的相同相对路径。文件内容仍不会纳入 Git。
+
+提交 `.worktreeinclude`，与团队共享这些模式。每位团队成员在用于创建 worktree 的检出中提供自己的忽略文件。
+
+## 模式语法 {#pattern-syntax}
+
+使用 gitignore 语法，每行一个模式。注释以 `#` 开头。模式前加 `!` 可排除匹配项：
+
+```gitignore
+# Local environment and configuration
+.env
+config/*.local.json
+!config/production.local.json
+```
+
+模式只会选择 Git 已忽略的文件。在此添加路径不会使 Git 忽略该文件，需要时还应配置 `.gitignore`。已跟踪的文件和未被 Git 忽略的未跟踪文件都不会被复制。
+
+## 文件复制时机 {#when-files-are-copied}
+
+内置的 `worktree-include` 插件从用于创建 worktree 的检出读取该文件。源检出也可以是另一个 worktree。保持该插件启用才能执行复制。
+
+- 没有 `.worktreeinclude` 时，插件不会复制任何文件。
+- 匹配的文件必须存在于源检出中。
+- 目标中已存在的文件会被跳过，保留原有内容。
+- 复制发生在创建期间，之后不会在检出之间持续同步。
+- 复制错误会中止创建并删除新 worktree。避免包含符号链接目录或嵌套仓库，因为它们无法作为文件复制。
+
+## 在 setup 期间运行命令 {#run-commands-during-setup}
+
+使用 `.worktreeinclude` 复制本地已有文件。使用 [setup 钩子](/docs/worktrees#setup-and-teardown) 安装依赖、生成文件或获取密钥：
+
+```json
+{
+  "worktree": {
+    "setup": "npm ci"
+  }
+}
+```
+
+将此配置放入新 worktree 所用基准分支的 `paseo.json` 中。setup 运行时，复制的文件已可使用。

scripts/ci-workflow.test.mjs

@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import { readFileSync, readdirSync, mkdtempSync, writeFileSync, rmSync } from "node:fs";
+import { readFileSync, readdirSync, mkdtempSync, mkdirSync, writeFileSync, rmSync } from "node:fs";
 import { spawnSync } from "node:child_process";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
@@ -679,3 +679,48 @@ test("macOS jobs use latest runners while preserving release architectures", ()
   // GitHub has no standard macos-latest-intel alias; use the newest Intel image.
   assert.match(release, /runner: macos-26-intel\n\s+electron_arch: x64/);
 });
+
+test("Nix desktop packaging resolves the workspace-local builder", () => {
+  const source = readFileSync(new URL("nix/desktop-package.nix", repoRoot), "utf8");
+  const invocation = source.match(/^\s+([^\n]*electron-builder) \\\n/m)?.[1];
+  assert.ok(invocation, "Nix invokes the desktop packaging tool");
+  const directory = mkdtempSync(join(tmpdir(), "nix-builder-resolution-"));
+  try {
+    const desktop = join(directory, "packages/desktop");
+    mkdirSync(join(desktop, "node_modules/.bin"), { recursive: true });
+    mkdirSync(join(desktop, "node_modules/electron-builder"));
+    writeFileSync(
+      join(desktop, "node_modules/electron-builder/package.json"),
+      JSON.stringify({
+        name: "electron-builder",
+        version: "1.0.0",
+        bin: { "electron-builder": "../.bin/electron-builder" },
+      }),
+    );
+    writeFileSync(
+      join(directory, "package.json"),
+      JSON.stringify({ private: true, workspaces: ["packages/desktop"] }),
+    );
+    writeFileSync(
+      join(desktop, "package.json"),
+      JSON.stringify({
+        name: "desktop-fixture",
+        private: true,
+        devDependencies: { "electron-builder": "1.0.0" },
+      }),
+    );
+    writeFileSync(
+      join(desktop, "node_modules/.bin/electron-builder"),
+      '#!/bin/sh\nprintf "workspace-builder\\n"\n',
+      { mode: 0o755 },
+    );
+    const result = spawnSync("sh", ["-c", `${invocation} --version`], {
+      cwd: desktop,
+      encoding: "utf8",
+    });
+    assert.equal(result.status, 0, result.stderr);
+    assert.equal(result.stdout.trim(), "workspace-builder");
+  } finally {
+    rmSync(directory, { recursive: true, force: true });
+  }
+});