diff --git a/sdk/typescript/_bundled_plugin/mcp/server.mjs.br.part-000 b/sdk/typescript/_bundled_plugin/mcp/server.mjs.br.part-000
index 36fc92f4..522f3740 100644
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diff --git a/sdk/typescript/_bundled_plugin/mcp/server.mjs.br.part-001 b/sdk/typescript/_bundled_plugin/mcp/server.mjs.br.part-001
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diff --git a/sdk/typescript/tests-ts/deep-scan-worker-shutdown.test.ts b/sdk/typescript/tests-ts/deep-scan-worker-shutdown.test.ts
new file mode 100644
index 00000000..dbe0815e
--- /dev/null
+++ b/sdk/typescript/tests-ts/deep-scan-worker-shutdown.test.ts
@@ -0,0 +1,207 @@
+import { readFile } from "node:fs/promises";
+import { join } from "node:path";
+import { brotliDecompressSync } from "node:zlib";
+import { expect, test } from "bun:test";
+import { PLUGIN_ROOT } from "./plugin-root.js";
+
+type WorkerEvent =
+  | { type: "thread.started"; thread_id: string }
+  | { type: "item.completed"; item: { type: "agent_message"; text: string } }
+  | { type: "turn.completed" }
+  | { type: "turn.failed"; error: { message: string } };
+
+type WorkerExecutorConstructor = new (settings: {
+  parentSandbox: { filesystem: "workspace-write"; network: "restricted" };
+}) => {
+  run(request: {
+    kind: "discovery";
+    promptPath: string;
+    workingDirectory: string;
+    subagents: number;
+    signal: AbortSignal;
+    onThreadStarted?: () => void;
+  }): Promise<{ finalResponse: string; threadId?: string }>;
+};
+
+async function bundledWorkerExecutor(
+  events: (signal: AbortSignal) => AsyncGenerator<WorkerEvent>,
+): Promise<WorkerExecutorConstructor> {
+  const chunks = await Promise.all(
+    ["000", "001"].map((part) =>
+      readFile(join(PLUGIN_ROOT, "mcp", `server.mjs.br.part-${part}`)),
+    ),
+  );
+  const runtime = brotliDecompressSync(Buffer.concat(chunks)).toString("utf8");
+  const source = /var CodexSdkWorkerExecutor = class \{[\s\S]*?\n\};/u.exec(
+    runtime,
+  )?.[0];
+  if (source === undefined) {
+    throw new Error("Bundled Deep Scan worker executor was not found.");
+  }
+
+  class FakeCodex {
+    startThread() {
+      return {
+        id: "fixture-worker-thread",
+        async runStreamed(_input: string, options: { signal: AbortSignal }) {
+          return { events: events(options.signal) };
+        },
+      };
+    }
+  }
+
+  return new Function(
+    "Codex",
+    "import_node_fs11",
+    "assertVerifiedParentSandbox",
+    "resolveCodexPath",
+    "workerSubagentConfig",
+    "appendSafeItemDiagnostic",
+    "classifyCodexWorkerError",
+    `${source}\nreturn CodexSdkWorkerExecutor;`,
+  )(
+    FakeCodex,
+    { promises: { readFile: async () => "fixture worker prompt" } },
+    () => {},
+    () => "/fixture/codex",
+    () => ({}),
+    () => {},
+    (error: unknown) => error,
+  ) as WorkerExecutorConstructor;
+}
+
+function runWorker(
+  WorkerExecutor: WorkerExecutorConstructor,
+  signal: AbortSignal,
+  onThreadStarted?: () => void,
+) {
+  return new WorkerExecutor({
+    parentSandbox: { filesystem: "workspace-write", network: "restricted" },
+  }).run({
+    kind: "discovery",
+    promptPath: "/fixture/prompt.md",
+    workingDirectory: "/fixture/artifacts",
+    subagents: 0,
+    signal,
+    ...(onThreadStarted ? { onThreadStarted } : {}),
+  });
+}
+
+test("settles completed bundled Deep Scan workers during coordinator cancellation", async () => {
+  const parentController = new AbortController();
+  let workerSignal: AbortSignal | undefined;
+  let iteratorClosed = false;
+  const WorkerExecutor = await bundledWorkerExecutor(async function* (
+    signal: AbortSignal,
+  ) {
+    workerSignal = signal;
+    try {
+      yield { type: "thread.started", thread_id: "fixture-worker-thread" };
+      yield {
+        type: "item.completed",
+        item: { type: "agent_message", text: "worker completed" },
+      };
+      yield { type: "turn.completed" };
+      await new Promise<void>(() => {});
+    } finally {
+      iteratorClosed = true;
+      parentController.abort(
+        "coordinator canceled its remaining workers during cleanup",
+      );
+    }
+  });
+  const timeout = setTimeout(() => {
+    parentController.abort("completed bundled worker remained pending");
+  }, 1_000);
+
+  try {
+    const result = await runWorker(WorkerExecutor, parentController.signal);
+
+    expect(result).toEqual({
+      finalResponse: "worker completed",
+      threadId: "fixture-worker-thread",
+    });
+    expect(iteratorClosed).toBe(true);
+    expect(parentController.signal.aborted).toBe(true);
+    expect(workerSignal).not.toBe(parentController.signal);
+    expect(workerSignal?.aborted).toBe(false);
+  } finally {
+    clearTimeout(timeout);
+  }
+});
+
+test("forwards coordinator cancellation to active bundled Deep Scan workers", async () => {
+  const parentController = new AbortController();
+  const cancellation = new Error("coordinator canceled an active worker");
+  let workerSignal: AbortSignal | undefined;
+  let iteratorClosed = false;
+  const WorkerExecutor = await bundledWorkerExecutor(async function* (
+    signal: AbortSignal,
+  ) {
+    workerSignal = signal;
+    try {
+      yield { type: "thread.started", thread_id: "fixture-worker-thread" };
+      signal.throwIfAborted();
+      yield { type: "turn.completed" };
+    } finally {
+      iteratorClosed = true;
+    }
+  });
+
+  await expect(
+    runWorker(WorkerExecutor, parentController.signal, () => {
+      parentController.abort(cancellation);
+    }),
+  ).rejects.toThrow(cancellation.message);
+  expect(iteratorClosed).toBe(true);
+  expect(workerSignal).not.toBe(parentController.signal);
+  expect(workerSignal?.aborted).toBe(true);
+  expect(workerSignal?.reason).toBe(cancellation);
+});
+
+test("preserves cancellation when a bundled Deep Scan worker starts aborted", async () => {
+  const cancellation = new Error("coordinator canceled before worker startup");
+  const parentController = new AbortController();
+  parentController.abort(cancellation);
+  let workerSignal: AbortSignal | undefined;
+  const WorkerExecutor = await bundledWorkerExecutor(async function* (
+    signal: AbortSignal,
+  ) {
+    workerSignal = signal;
+    signal.throwIfAborted();
+    yield { type: "turn.completed" };
+  });
+
+  await expect(
+    runWorker(WorkerExecutor, parentController.signal),
+  ).rejects.toThrow(cancellation.message);
+  expect(workerSignal).not.toBe(parentController.signal);
+  expect(workerSignal?.aborted).toBe(true);
+  expect(workerSignal?.reason).toBe(cancellation);
+});
+
+test("detaches bundled Deep Scan worker cancellation after terminal failure", async () => {
+  const parentController = new AbortController();
+  let workerSignal: AbortSignal | undefined;
+  let iteratorClosed = false;
+  const WorkerExecutor = await bundledWorkerExecutor(async function* (
+    signal: AbortSignal,
+  ) {
+    workerSignal = signal;
+    try {
+      yield {
+        type: "turn.failed",
+        error: { message: "fixture worker failed" },
+      };
+    } finally {
+      iteratorClosed = true;
+    }
+  });
+
+  await expect(
+    runWorker(WorkerExecutor, parentController.signal),
+  ).rejects.toThrow("fixture worker failed");
+  expect(iteratorClosed).toBe(true);
+  parentController.abort("coordinator canceled after terminal failure");
+  expect(workerSignal?.aborted).toBe(false);
+});