diff --git a/apps/server/scripts/claude-question-withdrawal-evidence.ts b/apps/server/scripts/claude-question-withdrawal-evidence.ts
new file mode 100644
index 0000000000000..1c9a3d44db608
--- /dev/null
+++ b/apps/server/scripts/claude-question-withdrawal-evidence.ts
@@ -0,0 +1,648 @@
+// @effect-diagnostics nodeBuiltinImport:off globalTimers:off globalDate:off globalFetch:off globalConsole:off preferSchemaOverJson:off - Host-side evidence driver retains raw wire evidence and owns deadline timers.
+// Runtime evidence for withdrawn Claude AskUserQuestion requests. Starts a real
+// server from --worktree against an isolated --home, backs the claudeAgent
+// instance with testFixtures/claudeQuestionMockCli.mjs, and records what the
+// database, the subscribeThread stream and the fixture saw for each row:
+//   node apps/server/scripts/claude-question-withdrawal-evidence.ts \
+//     --worktree <tree> --home /tmp/<rev>/home --out /tmp/<rev> --row all
+import * as NodeAssert from "node:assert/strict";
+import * as NodeChildProcess from "node:child_process";
+import * as NodeCrypto from "node:crypto";
+import * as NodeFS from "node:fs";
+import * as NodeHttp from "node:http";
+import * as NodeOS from "node:os";
+import * as NodePath from "node:path";
+import * as NodeSqlite from "node:sqlite";
+import * as NodeUtil from "node:util";
+import * as Effect from "effect/Effect";
+import * as Layer from "effect/Layer";
+import * as Schema from "effect/Schema";
+import * as Stream from "effect/Stream";
+import { Socket } from "effect/socket";
+import { RpcClient, RpcSerialization } from "effect/rpc";
+import {
+  ORCHESTRATION_PROTOCOL_VERSION,
+  ORCHESTRATION_PROTOCOL_HEADER,
+  CommandId,
+  ProjectId,
+  ProviderInstanceId,
+  RunId,
+  RuntimeRequestId,
+  ThreadId,
+  WsRpcGroup,
+  type OrchestrationV2ThreadStreamItem,
+} from "@t3tools/contracts";
+
+const ROWS = ["A1", "A2", "A3", "A4", "B", "C"] as const;
+type Row = (typeof ROWS)[number];
+const { values } = NodeUtil.parseArgs({
+  options: {
+    worktree: { type: "string" },
+    home: { type: "string" },
+    out: { type: "string" },
+    row: { type: "string", default: "all" },
+    timeout: { type: "string", default: "60" },
+  },
+});
+NodeAssert.ok(
+  values.worktree && values.home && values.out,
+  "--worktree, --home and --out are required",
+);
+const worktree = NodePath.resolve(values.worktree);
+const home = NodePath.resolve(values.home);
+const out = NodePath.resolve(values.out);
+NodeAssert.ok(
+  !home.startsWith(NodePath.join(NodeOS.homedir(), ".t3")),
+  "--home must not point at the live T3 home",
+);
+const rows: ReadonlyArray<Row> =
+  values.row === "all"
+    ? ROWS
+    : [ROWS.find((row) => row === values.row) ?? NodeAssert.fail("bad --row")];
+const timeoutMs = Number(values.timeout) * 1000;
+const fixture = NodePath.resolve(
+  import.meta.dirname,
+  "../src/provider/testFixtures/claudeQuestionMockCli.mjs",
+);
+const traces = NodePath.join(out, "traces");
+
+NodeFS.rmSync(home, { recursive: true, force: true });
+NodeFS.mkdirSync(NodePath.join(home, "userdata"), { recursive: true });
+NodeFS.mkdirSync(NodePath.join(home, "claude-home"), { recursive: true });
+NodeFS.mkdirSync(traces, { recursive: true });
+for (const row of rows) {
+  for (const name of NodeFS.readdirSync(traces)) {
+    if (name.startsWith(`${row}-`) || name.startsWith(`${row}.`)) {
+      NodeFS.rmSync(NodePath.join(traces, name));
+    }
+  }
+}
+NodeFS.writeFileSync(
+  NodePath.join(home, "userdata", "settings.json"),
+  JSON.stringify({
+    providerInstances: {
+      claudeAgent: {
+        driver: "claudeAgent",
+        enabled: true,
+        config: { binaryPath: fixture, homePath: NodePath.join(home, "claude-home") },
+      },
+    },
+  }),
+);
+const project = NodePath.join(home, "project");
+NodeFS.mkdirSync(project);
+NodeChildProcess.execFileSync("git", ["init", "-q", project]);
+NodeChildProcess.execFileSync("git", [
+  "-C",
+  project,
+  "-c",
+  "user.name=Evidence",
+  "-c",
+  "user.email=evidence@localhost",
+  "commit",
+  "--allow-empty",
+  "-qm",
+  "initial",
+]);
+const git = (args: ReadonlyArray<string>) =>
+  NodeChildProcess.execFileSync("git", args, { cwd: worktree, encoding: "utf8" }).trim();
+const manifest = {
+  worktree,
+  revision: git(["rev-parse", "HEAD"]),
+  dirty: git(["status", "--porcelain"]),
+  fixture,
+  fixtureSha256: NodeCrypto.createHash("sha256").update(NodeFS.readFileSync(fixture)).digest("hex"),
+  driverSha256: NodeCrypto.createHash("sha256")
+    .update(NodeFS.readFileSync(import.meta.filename))
+    .digest("hex"),
+  node: process.version,
+  startedAt: new Date().toISOString(),
+};
+NodeFS.writeFileSync(NodePath.join(out, "manifest.json"), JSON.stringify(manifest, null, 2));
+
+const reservation = NodeHttp.createServer();
+reservation.listen(0, "127.0.0.1");
+await new Promise<void>((done) => reservation.once("listening", done));
+const address = reservation.address();
+NodeAssert.ok(address && typeof address !== "string");
+await new Promise<void>((done) => reservation.close(() => done()));
+const port = address.port;
+const origin = `http://127.0.0.1:${port}`;
+const bootstrap = NodeCrypto.randomUUID();
+const serverLog = NodePath.join(out, "server.log");
+NodeFS.writeFileSync(serverLog, "");
+const server = NodeChildProcess.spawn(
+  process.execPath,
+  [
+    "apps/server/src/bin.ts",
+    "start",
+    "--bootstrap-fd",
+    "3",
+    "--base-dir",
+    home,
+    "--log-level",
+    "debug",
+  ],
+  {
+    cwd: worktree,
+    detached: true,
+    stdio: ["ignore", "pipe", "pipe", "pipe"],
+    // An ambient T3CODE_HOME outranks the bootstrap t3Home and would point the
+    // server at the live install; --base-dir pins the isolated home instead.
+    env: Object.fromEntries(
+      Object.entries(process.env).filter(([key]) => !key.startsWith("T3CODE_")),
+    ),
+  },
+);
+console.log(`server pid ${server.pid} port ${port} cwd ${worktree}`);
+NodeFS.appendFileSync(NodePath.join(out, "pids.txt"), `server ${server.pid} port ${port}\n`);
+const bootstrapPipe = server.stdio[3];
+NodeAssert.ok(bootstrapPipe && "write" in bootstrapPipe);
+bootstrapPipe.end(
+  JSON.stringify({
+    mode: "desktop",
+    noBrowser: true,
+    port,
+    t3Home: home,
+    host: "127.0.0.1",
+    desktopBootstrapToken: bootstrap,
+    tailscaleServeEnabled: false,
+    tailscaleServePort: 443,
+  }),
+);
+const ready = Promise.withResolvers<void>();
+let recentOutput = "";
+for (const pipe of [server.stdout, server.stderr])
+  pipe?.on("data", (data: Buffer) => {
+    const text = data.toString().replaceAll(bootstrap, "[REDACTED]");
+    NodeFS.appendFileSync(serverLog, text);
+    recentOutput = (recentOutput + text).slice(-8192);
+    if (recentOutput.includes("startup phase: complete")) ready.resolve();
+  });
+server.once("exit", (code) => ready.reject(new Error(`Server exited ${code}`)));
+const startupDeadline = setTimeout(
+  () => ready.reject(new Error("Server startup timed out")),
+  60_000,
+);
+
+const db = () =>
+  new NodeSqlite.DatabaseSync(NodePath.join(home, "userdata", "statev2.sqlite"), {
+    readOnly: true,
+  });
+function dbCapture(threadId: string) {
+  const handle = db();
+  try {
+    return {
+      events: handle
+        .prepare(
+          `SELECT sequence, event_type, command_id,
+                  json_extract(metadata_json,'$.driver') driver,
+                  json_extract(payload_json,'$.id') id,
+                  json_extract(payload_json,'$.status') status,
+                  json_extract(payload_json,'$.kind') kind,
+                  json_extract(payload_json,'$.type') item_type,
+                  json_extract(payload_json,'$.nativeRequestRef.nativeId') native_id,
+                  json_extract(payload_json,'$.resolvedAt') resolved_at,
+                  occurred_at
+           FROM orchestration_events
+           WHERE stream_id = ? AND event_type IN
+             ('runtime-request.updated','node.updated','turn-item.updated','provider-turn.updated','run.updated')
+           ORDER BY sequence`,
+        )
+        .all(threadId),
+      runtimeRequests: handle
+        .prepare(
+          `SELECT runtime_request_id id, kind, status, resolved_at,
+                  json_extract(payload_json,'$.nativeRequestRef.nativeId') native_id
+           FROM orchestration_v2_projection_runtime_requests WHERE thread_id = ?`,
+        )
+        .all(threadId),
+    };
+  } finally {
+    handle.close();
+  }
+}
+
+type RequestState = { id: string; nativeId: string | null; kind: string; status: string };
+class RowStream {
+  readonly items: Array<OrchestrationV2ThreadStreamItem> = [];
+  readonly requests = new Map<string, RequestState>();
+  readonly runs = new Map<string, string>();
+  readonly log: Array<string> = [];
+  private listeners = new Set<() => void>();
+  readonly file: string;
+  constructor(file: string) {
+    this.file = file;
+  }
+  push(item: OrchestrationV2ThreadStreamItem) {
+    this.items.push(item);
+    NodeFS.appendFileSync(this.file, JSON.stringify(item) + "\n");
+    if (item.kind === "snapshot") {
+      for (const request of item.projection.runtimeRequests) this.setRequest(request);
+      for (const run of item.projection.runs) this.runs.set(run.id, run.status);
+      this.log.push(
+        `snapshot@${item.snapshotSequence} requests=${JSON.stringify([...this.requests.values()].map((r) => ({ ...r, id: short(r.id) })))} runs=${JSON.stringify([...this.runs])}`,
+      );
+    } else if (item.kind === "event") {
+      const event = item.event;
+      const payload: Record<string, unknown> =
+        "payload" in event && typeof event.payload === "object" && event.payload !== null
+          ? (event.payload as Record<string, unknown>)
+          : {};
+      if (event.type === "runtime-request.updated") this.setRequest(payload);
+      if (event.type === "run.updated") this.runs.set(String(payload.id), String(payload.status));
+      if (
+        [
+          "runtime-request.updated",
+          "node.updated",
+          "turn-item.updated",
+          "provider-turn.updated",
+          "run.updated",
+        ].includes(event.type)
+      ) {
+        this.log.push(
+          `event seq=${item.sequence} ${event.type} id=${short(payload.id)} status=${String(payload.status)}${
+            payload.kind ? ` kind=${String(payload.kind)}` : ""
+          }${payload.type ? ` type=${String(payload.type)}` : ""}${
+            event.type === "runtime-request.updated" ? ` native=${nativeIdOf(payload)}` : ""
+          }`,
+        );
+      }
+    }
+    for (const listener of this.listeners) listener();
+  }
+  private setRequest(payload: Record<string, unknown> | RequestState | object) {
+    const record = payload as Record<string, unknown>;
+    this.requests.set(String(record.id), {
+      id: String(record.id),
+      nativeId: nativeIdOf(record),
+      kind: String(record.kind),
+      status: String(record.status),
+    });
+  }
+  pending() {
+    return [...this.requests.values()].filter(
+      (request) => request.kind === "user_input" && request.status === "pending",
+    );
+  }
+  request(nativeId: string) {
+    return [...this.requests.values()].find((request) => request.nativeId === nativeId);
+  }
+  waitFor(label: string, predicate: () => boolean) {
+    return Effect.promise(
+      () =>
+        new Promise<void>((resolve, reject) => {
+          const check = () => {
+            if (!predicate()) return;
+            this.listeners.delete(check);
+            clearTimeout(deadline);
+            resolve();
+          };
+          const deadline = setTimeout(() => {
+            this.listeners.delete(check);
+            reject(new Error(`Timed out waiting for ${label}`));
+          }, timeoutMs);
+          this.listeners.add(check);
+          check();
+        }),
+    );
+  }
+}
+// Ids embed the whole thread/turn path; keep the head and the distinguishing tail.
+const short = (value: unknown) => {
+  const text = String(value ?? "-");
+  return text.length > 72 ? `${text.slice(0, 28)}…${text.slice(-40)}` : text;
+};
+function nativeIdOf(record: Record<string, unknown>) {
+  const ref = record.nativeRequestRef;
+  return typeof ref === "object" && ref !== null && "nativeId" in ref
+    ? String((ref as { nativeId: unknown }).nativeId)
+    : null;
+}
+const TERMINAL_RUN = new Set(["completed", "failed", "cancelled", "interrupted", "rolled_back"]);
+const isoNow = () => new Date().toISOString();
+const sleep = (ms: number) => Effect.promise(() => new Promise((done) => setTimeout(done, ms)));
+const touch = (path: string) => Effect.sync(() => NodeFS.writeFileSync(path, ""));
+function readTraces(row: Row) {
+  return NodeFS.readdirSync(traces)
+    .filter((name) => name.startsWith(`${row}-`) && name.endsWith(".ndjson"))
+    .flatMap((name) =>
+      NodeFS.readFileSync(NodePath.join(traces, name), "utf8")
+        .split("\n")
+        .filter(Boolean)
+        .map((line) => ({ file: name, ...JSON.parse(line) })),
+    );
+}
+function summarizeTrace(row: Row) {
+  return readTraces(row).map((entry) => {
+    if (entry.event) return `${entry.file} ${entry.event} code=${entry.code}`;
+    const frame = entry.frame ?? {};
+    const request = frame.request ?? {};
+    const response = frame.response ?? {};
+    const toolUse = frame.message?.content?.find?.(
+      (part: { type?: string }) => part.type === "tool_use" || part.type === "tool_result",
+    );
+    return [
+      entry.dir,
+      frame.type,
+      request.subtype ?? frame.subtype ?? "",
+      frame.request_id ?? response.request_id ?? "",
+      request.tool_use_id ?? toolUse?.id ?? toolUse?.tool_use_id ?? "",
+      response.response?.behavior ? `behavior=${response.response.behavior}` : "",
+      response.response?.message ? `message=${JSON.stringify(response.response.message)}` : "",
+      response.response?.updatedInput?.answers
+        ? `answers=${JSON.stringify(response.response.updatedInput.answers)}`
+        : "",
+    ]
+      .filter(Boolean)
+      .join(" ");
+  });
+}
+
+const results: Array<Record<string, unknown>> = [];
+try {
+  await ready.promise;
+  clearTimeout(startupDeadline);
+  const tokenResponse = await fetch(`${origin}/oauth/token`, {
+    method: "POST",
+    body: new URLSearchParams({
+      grant_type: "urn:ietf:params:oauth:grant-type:token-exchange",
+      subject_token: bootstrap,
+      subject_token_type: "urn:t3:params:oauth:token-type:environment-bootstrap",
+      requested_token_type: "urn:ietf:params:oauth:token-type:access_token",
+    }),
+  });
+  NodeAssert.ok(tokenResponse.ok, `Authentication failed: ${tokenResponse.status}`);
+  const token = Schema.decodeUnknownSync(Schema.Struct({ access_token: Schema.String }))(
+    await tokenResponse.json(),
+  );
+  const headers = {
+    Authorization: `Bearer ${token.access_token}`,
+    "Content-Type": "application/json",
+    [ORCHESTRATION_PROTOCOL_HEADER]: String(ORCHESTRATION_PROTOCOL_VERSION),
+  };
+  const projectId = ProjectId.make(NodeCrypto.randomUUID());
+  const created = await fetch(`${origin}/api/projects/mutate`, {
+    method: "POST",
+    headers,
+    body: JSON.stringify({
+      type: "project.create",
+      commandId: NodeCrypto.randomUUID(),
+      projectId,
+      title: "Question withdrawal evidence",
+      workspaceRoot: project,
+    }),
+  });
+  NodeAssert.ok(created.ok, `Project creation failed: ${created.status} ${await created.text()}`);
+
+  for (const row of rows) {
+    const ticketResponse = await fetch(`${origin}/api/auth/websocket-ticket`, {
+      method: "POST",
+      headers,
+    });
+    NodeAssert.ok(ticketResponse.ok, `WebSocket authentication failed: ${ticketResponse.status}`);
+    const ticket = Schema.decodeUnknownSync(Schema.Struct({ ticket: Schema.String }))(
+      await ticketResponse.json(),
+    );
+    const layerProtocol = RpcClient.layerProtocolSocket().pipe(
+      Layer.provide(
+        Socket.layerWebSocket(
+          `${origin.replace("http:", "ws:")}/ws?orchestrationProtocol=${ORCHESTRATION_PROTOCOL_VERSION}&wsTicket=${encodeURIComponent(ticket.ticket)}`,
+        ).pipe(Layer.provide(Socket.layerWebSocketConstructorGlobal)),
+      ),
+      Layer.provide(RpcSerialization.layerJson),
+    );
+    const threadId = ThreadId.make(NodeCrypto.randomUUID());
+    const streamFile = NodePath.join(out, `${row}.stream.ndjson`);
+    NodeFS.writeFileSync(streamFile, "");
+    const stream = new RowStream(streamFile);
+    const checkpoints: Array<Record<string, unknown>> = [];
+    const checkpoint = (label: string) =>
+      Effect.sync(() => {
+        const snapshot = {
+          label,
+          at: isoNow(),
+          streamPending: stream.pending(),
+          streamRequests: [...stream.requests.values()],
+          streamRuns: Object.fromEntries(stream.runs),
+          db: dbCapture(threadId),
+        };
+        checkpoints.push(snapshot);
+        stream.log.push(
+          `-- checkpoint ${label}: stream pending=${JSON.stringify(snapshot.streamPending.map((r) => r.nativeId))}`,
+        );
+      });
+    const program = Effect.gen(function* () {
+      const client = yield* RpcClient.make(WsRpcGroup);
+      const dispatch = (
+        command: Parameters<(typeof client)["orchestration.dispatchCommand"]>[0],
+      ) => {
+        stream.log.push(`-> dispatch ${command.type}`);
+        return client["orchestration.dispatchCommand"](command);
+      };
+      yield* client["orchestration.launchThread"]({
+        commandId: CommandId.make(NodeCrypto.randomUUID()),
+        threadId,
+        projectId,
+        title: `Question withdrawal ${row}`,
+        modelSelection: {
+          instanceId: ProviderInstanceId.make("claudeAgent"),
+          model: "claude-sonnet-4-6",
+        },
+        runtimeMode: "full-access",
+        interactionMode: "default",
+        workspaceStrategy: { type: "root" },
+        initialMessage: { text: `ROW:${row} TRACE:${traces} Ask me Red or Blue.`, attachments: [] },
+      });
+      // Subscribing before the launch commits finds no thread and ends the stream.
+      yield* client["orchestration.subscribeThread"]({ threadId }).pipe(
+        Stream.runForEach((item) => Effect.sync(() => stream.push(item))),
+        Effect.catchCause((cause) =>
+          Effect.sync(() => stream.log.push(`stream ended: ${String(cause)}`)),
+        ),
+        Effect.forkScoped,
+      );
+      yield* stream.waitFor(
+        "Q1 pending on the stream",
+        () => stream.request("toolu_q1")?.status === "pending",
+      );
+      yield* checkpoint("Q1 pending (before action)");
+      const q1 = stream.request("toolu_q1")!;
+      const activeRun = () =>
+        [...stream.runs].find(([, status]) => !TERMINAL_RUN.has(status))?.[0] ??
+        NodeAssert.fail("no active run");
+      const answer = (requestId: string) =>
+        dispatch({
+          type: "runtime-request.respond",
+          commandId: CommandId.make(NodeCrypto.randomUUID()),
+          threadId,
+          requestId: RuntimeRequestId.make(requestId),
+          answers: { "Red or Blue?": "Blue" },
+        });
+      switch (row) {
+        case "A1":
+          yield* dispatch({
+            type: "run.interrupt",
+            commandId: CommandId.make(NodeCrypto.randomUUID()),
+            threadId,
+            runId: RunId.make(activeRun()),
+            reason: "evidence A1",
+          });
+          break;
+        case "A2":
+          yield* dispatch({
+            type: "thread.stop",
+            commandId: CommandId.make(NodeCrypto.randomUUID()),
+            threadId,
+            reason: "evidence A2",
+          });
+          break;
+        case "A3":
+          stream.log.push("-> touch A3.die (fixture exits 1)");
+          yield* touch(NodePath.join(traces, "A3.die"));
+          break;
+        case "A4":
+          stream.log.push("-> touch A4.cancel (fixture sends control_cancel_request cu_q1)");
+          yield* touch(NodePath.join(traces, "A4.cancel"));
+          yield* stream.waitFor(
+            "Q2 pending on the stream",
+            () => stream.request("toolu_q2")?.status === "pending",
+          );
+          yield* checkpoint("K: Q2 pending, turn alive");
+          yield* answer(stream.request("toolu_q2")!.id);
+          break;
+        case "B":
+        case "C":
+          yield* answer(q1.id);
+          break;
+      }
+      yield* stream.waitFor(
+        "run terminal",
+        () =>
+          stream.runs.size > 0 &&
+          [...stream.runs.values()].every((status) => TERMINAL_RUN.has(status)),
+      );
+      // Late provider events (the adapter's own cancellation racing the
+      // terminal cleanup) land within this window.
+      yield* sleep(1500);
+      yield* checkpoint("final");
+      return yield* client["orchestration.getThreadProjection"]({ threadId });
+    }).pipe(Effect.scoped, Effect.provide(layerProtocol));
+    let projection: unknown = null;
+    let error: string | null = null;
+    try {
+      projection = await Effect.runPromise(program);
+    } catch (cause) {
+      error = String(cause);
+      console.error(`${row}: ${error}`);
+    }
+    // A1–A3 end the fixture process; wait briefly for its exit record.
+    for (let attempt = 0; attempt < 40 && ["A1", "A2", "A3"].includes(row); attempt++) {
+      if (readTraces(row).some((entry) => entry.event === "exit")) break;
+      await new Promise((done) => setTimeout(done, 100));
+    }
+    const final = dbCapture(threadId);
+    const q1Events = (final.events as Array<Record<string, unknown>>).filter(
+      (event) => event.event_type === "runtime-request.updated" && event.native_id === "toolu_q1",
+    );
+    const kPoint = checkpoints.find((point) => String(point.label).startsWith("K"));
+    const q2PendingSeq = (final.events as Array<Record<string, unknown>>).find(
+      (event) =>
+        event.event_type === "runtime-request.updated" &&
+        event.native_id === "toolu_q2" &&
+        event.status === "pending",
+    )?.sequence;
+    const q1CancelSeqs = q1Events
+      .filter((event) => event.status === "cancelled")
+      .map((event) => event.sequence);
+    const summary = {
+      row,
+      threadId,
+      error,
+      q1Statuses: q1Events.map((event) => `${String(event.sequence)}:${String(event.status)}`),
+      q1CancelledCount: q1CancelSeqs.length,
+      q1Resolved: q1Events.some((event) => event.status === "resolved"),
+      runs: Object.fromEntries(stream.runs),
+      ...(row === "A4"
+        ? {
+            atK_streamPending: (kPoint?.streamPending as Array<RequestState> | undefined)?.map(
+              (r) => r.nativeId,
+            ),
+            atK_dbPending: (
+              (kPoint?.db as ReturnType<typeof dbCapture> | undefined)?.runtimeRequests as
+                | Array<Record<string, unknown>>
+                | undefined
+            )
+              ?.filter((r) => r.status === "pending")
+              .map((r) => r.native_id),
+            q2PendingSeq,
+            q1CancelledBeforeQ2: q1CancelSeqs.some((seq) => Number(seq) < Number(q2PendingSeq)),
+          }
+        : {}),
+    };
+    results.push(summary);
+    NodeFS.writeFileSync(
+      NodePath.join(out, `${row}.db.json`),
+      JSON.stringify({ checkpoints, final, projection }, null, 2),
+    );
+    const table = (records: ReadonlyArray<Record<string, unknown>>) =>
+      records.map((record) => Object.values(record).map(short).join(" | "));
+    NodeFS.writeFileSync(
+      NodePath.join(out, `${row}.txt`),
+      [
+        `# Row ${row} — fixture: claudeQuestionMockCli`,
+        `revision ${manifest.revision} (${worktree})`,
+        `fixture sha256 ${manifest.fixtureSha256}  driver sha256 ${manifest.driverSha256}`,
+        `thread ${threadId}  server port ${port} pid ${server.pid}`,
+        "",
+        "## Summary",
+        JSON.stringify(summary, null, 2),
+        "",
+        "## Client stream (orchestration.subscribeThread), relevant items in arrival order",
+        ...stream.log,
+        "",
+        "## Persisted events (orchestration_events, stream_id = thread)",
+        "sequence | event_type | command_id | driver | id | status | kind | item_type | native_id | resolved_at | occurred_at",
+        ...table(final.events as Array<Record<string, unknown>>),
+        "",
+        "## Checkpoint projection rows (orchestration_v2_projection_runtime_requests)",
+        ...checkpoints.flatMap((point) => [
+          `-- ${String(point.label)}`,
+          ...table(
+            (point.db as ReturnType<typeof dbCapture>).runtimeRequests as Array<
+              Record<string, unknown>
+            >,
+          ),
+        ]),
+        "-- after row",
+        ...table(final.runtimeRequests as Array<Record<string, unknown>>),
+        "",
+        "## Fixture trace (dir type subtype request_id tool_use_id ...)",
+        ...summarizeTrace(row),
+        "",
+      ].join("\n"),
+    );
+    console.log(JSON.stringify(summary));
+  }
+} finally {
+  NodeFS.writeFileSync(NodePath.join(out, "results.json"), JSON.stringify(results, null, 2));
+  await stopServer();
+}
+
+async function stopServer() {
+  if (server.exitCode === null && server.signalCode === null) {
+    const stopped = new Promise<void>((done) => server.once("exit", () => done()));
+    server.kill("SIGTERM");
+    const deadline = setTimeout(() => server.kill("SIGKILL"), 10_000);
+    await stopped;
+    clearTimeout(deadline);
+  }
+  if (server.pid) {
+    try {
+      // The server and the fixture processes it spawned share this process group.
+      process.kill(-server.pid, "SIGKILL");
+    } catch (error) {
+      if (!(error instanceof Error && "code" in error && error.code === "ESRCH")) throw error;
+    }
+  }
+}
diff --git a/apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts b/apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts
index c38ec736884ea..3bbc2b0e7f1c0 100644
--- a/apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts
+++ b/apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts
@@ -3040,6 +3040,96 @@ describe("ClaudeAdapterV2 background wake turns", () => {
     });
   const makeWakeHarness = makeWakeHarnessWithOptions();
 
+  it.effect("withdraws an aborted AskUserQuestion while its replacement remains answerable", () =>
+    Effect.gen(function* () {
+      const harness = yield* makeWakeHarness;
+      yield* harness.runtime.startTurn(
+        makeClaudeTestTurnInput({
+          threadId: harness.threadId,
+          providerThread: harness.providerThread,
+          now: yield* DateTime.now,
+          attemptId: RunAttemptId.make("attempt-aborted-question"),
+          text: "Ask me to choose Red or Blue.",
+          attachments: [],
+        }),
+      );
+      const canUseTool = harness.getOpenedOptions()!.canUseTool!;
+      const questions = [
+        {
+          header: "Color",
+          question: "Red or Blue?",
+          options: [
+            { label: "Red", description: "Choose red." },
+            { label: "Blue", description: "Choose blue." },
+          ],
+          multiSelect: false,
+        },
+      ];
+      // @effect-diagnostics-next-line abortControllerInEffect:off - The test aborts the SDK callback directly to simulate Claude withdrawing the question.
+      const controller = new AbortController();
+      const original = yield* Effect.promise(() =>
+        canUseTool(
+          "AskUserQuestion",
+          { questions },
+          {
+            signal: controller.signal,
+            toolUseID: "question-original",
+            requestId: "request-original",
+          },
+        ),
+      ).pipe(Effect.forkScoped);
+      const pending = yield* Queue.take(harness.runtimeRequestReceipts);
+      assert.equal(pending.runtimeRequest.kind, "user_input");
+      assert.equal(pending.runtimeRequest.status, "pending");
+
+      controller.abort();
+      assert.equal((yield* Fiber.join(original))?.behavior, "deny");
+
+      const replacement = yield* Effect.promise(() =>
+        canUseTool(
+          "AskUserQuestion",
+          { questions },
+          {
+            signal: new AbortController().signal,
+            toolUseID: "question-replacement",
+            requestId: "request-replacement",
+          },
+        ),
+      ).pipe(Effect.forkScoped);
+      // The replacement receipt also drains any withdrawal emitted before the
+      // aborted callback returned, without waiting for an event that may be missing.
+      let next = yield* Queue.take(harness.runtimeRequestReceipts);
+      while (next.runtimeRequest.id === pending.runtimeRequest.id) {
+        next = yield* Queue.take(harness.runtimeRequestReceipts);
+      }
+      assert.equal(next.runtimeRequest.status, "pending");
+      yield* harness.runtime.respondToRuntimeRequest({
+        requestId: next.runtimeRequest.id,
+        answers: { "Red or Blue?": "Blue" },
+      });
+      assert.deepEqual(yield* Fiber.join(replacement), {
+        behavior: "allow",
+        updatedInput: { questions, answers: { "Red or Blue?": "Blue" } },
+        toolUseID: "question-replacement",
+      });
+      const originalUpdates = harness.events.filter(
+        (event) =>
+          event.type === "runtime_request.updated" &&
+          event.runtimeRequest.id === pending.runtimeRequest.id,
+      );
+      assert.deepEqual(
+        originalUpdates.map((event) =>
+          event.type === "runtime_request.updated" ? event.runtimeRequest.status : undefined,
+        ),
+        ["pending", "cancelled"],
+      );
+    }).pipe(
+      Effect.provide(
+        Layer.mergeAll(IdAllocator.layer, McpProviderSessions.layer, NodeServices.layer),
+      ),
+    ),
+  );
+
   it.effect.each(["release-after", "cancel-after", "release-before", "resume-pending"] as const)(
     "keeps attachment reservations across compaction: %s boundary",
     (outcome) =>
diff --git a/apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts b/apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts
index 428e44e19020c..fa66fdd0a4e5c 100644
--- a/apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts
+++ b/apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts
@@ -9580,19 +9580,41 @@ export const makeClaudeAdapterV2 = Effect.fn("makeClaudeAdapterV2")(function* (
                 }),
               ),
             );
-            return callbackOptions.signal.aborted
-              ? ({
-                  behavior: "deny",
-                  message: "User cancelled tool execution.",
-                } satisfies PermissionResult)
-              : ({
-                  behavior: "allow",
-                  updatedInput: {
-                    questions: toolInput.questions,
-                    answers: claudeSdkUserInputAnswers(resolvedAnswers),
-                  },
-                  toolUseID: callbackOptions.toolUseID,
-                } satisfies PermissionResult);
+            if (callbackOptions.signal.aborted) {
+              const resolvedAt = yield* DateTime.now;
+              yield* emitProviderEvent({
+                type: "runtime_request.updated",
+                driver: CLAUDE_PROVIDER,
+                runtimeRequest: { ...artifacts.request, status: "cancelled", resolvedAt },
+              });
+              yield* emitProviderEvent({
+                type: "node.updated",
+                driver: CLAUDE_PROVIDER,
+                node: { ...artifacts.node, status: "cancelled", completedAt: resolvedAt },
+              });
+              yield* emitProviderEvent({
+                type: "turn_item.updated",
+                driver: CLAUDE_PROVIDER,
+                turnItem: {
+                  ...artifacts.turnItem,
+                  status: "cancelled",
+                  completedAt: resolvedAt,
+                  updatedAt: resolvedAt,
+                },
+              });
+              return {
+                behavior: "deny",
+                message: "User cancelled tool execution.",
+              } satisfies PermissionResult;
+            }
+            return {
+              behavior: "allow",
+              updatedInput: {
+                questions: toolInput.questions,
+                answers: claudeSdkUserInputAnswers(resolvedAnswers),
+              },
+              toolUseID: callbackOptions.toolUseID,
+            } satisfies PermissionResult;
           }
 
           if (toolName === "ExitPlanMode") {
diff --git a/apps/server/src/provider/testFixtures/claudeQuestionMockCli.mjs b/apps/server/src/provider/testFixtures/claudeQuestionMockCli.mjs
new file mode 100755
index 0000000000000..78256d3394c3d
--- /dev/null
+++ b/apps/server/src/provider/testFixtures/claudeQuestionMockCli.mjs
@@ -0,0 +1,248 @@
+#!/usr/bin/env node
+// Stand-in for the Claude Code CLI speaking the Agent SDK's stream-json control
+// protocol. It asks one AskUserQuestion and then follows the row named in the
+// first prompt (`ROW:<id> TRACE:<dir>`). Driven by
+// apps/server/scripts/claude-question-withdrawal-evidence.ts.
+import * as NodeCrypto from "node:crypto";
+import * as NodeFS from "node:fs";
+import * as NodePath from "node:path";
+import * as NodeReadline from "node:readline";
+
+if (process.argv.includes("--version")) {
+  process.stdout.write("2.1.0 (Claude Code)\n");
+  process.exit(0);
+}
+
+const sessionId = NodeCrypto.randomUUID();
+const model = "claude-sonnet-4-6";
+const usage = { input_tokens: 1, output_tokens: 1 };
+const questions = [
+  {
+    header: "Color",
+    question: "Red or Blue?",
+    options: [
+      { label: "Red", description: "Choose red." },
+      { label: "Blue", description: "Choose blue." },
+    ],
+    multiSelect: false,
+  },
+];
+
+let row = null;
+let traceFile = null;
+let traceDir = null;
+const pendingTrace = [];
+const trace = (entry) => {
+  const line = JSON.stringify({ t: performance.timeOrigin + performance.now(), ...entry }) + "\n";
+  if (traceFile) NodeFS.appendFileSync(traceFile, line);
+  else pendingTrace.push(line);
+};
+const write = (frame) => {
+  trace({ dir: "out", frame });
+  process.stdout.write(`${JSON.stringify(frame)}\n`);
+};
+const exit = (code) => {
+  trace({ event: "exit", code });
+  process.exit(code);
+};
+process.on("SIGTERM", () => exit(0));
+
+const waiters = new Map();
+const waitForResponse = (requestId) => new Promise((resolve) => waiters.set(requestId, resolve));
+const waitForFile = (path) =>
+  new Promise((resolve) => {
+    const poll = setInterval(() => {
+      if (NodeFS.existsSync(path)) {
+        clearInterval(poll);
+        resolve();
+      }
+    }, 50);
+  });
+
+const initializeResponse = {
+  commands: [],
+  agents: [],
+  models: [],
+  output_style: "default",
+  available_output_styles: ["default"],
+  account: { email: "fixture@example.invalid", subscriptionType: "max", tokenSource: "fixture" },
+};
+
+function ask(n) {
+  const toolUseId = `toolu_q${n}`;
+  const requestId = `cu_q${n}`;
+  write({
+    type: "assistant",
+    parent_tool_use_id: null,
+    session_id: sessionId,
+    uuid: NodeCrypto.randomUUID(),
+    message: {
+      id: `msg_q${n}`,
+      type: "message",
+      role: "assistant",
+      model,
+      content: [{ type: "tool_use", id: toolUseId, name: "AskUserQuestion", input: { questions } }],
+      stop_reason: "tool_use",
+      stop_sequence: null,
+      usage,
+    },
+  });
+  const response = waitForResponse(requestId);
+  write({
+    type: "control_request",
+    request_id: requestId,
+    request: {
+      subtype: "can_use_tool",
+      tool_name: "AskUserQuestion",
+      input: { questions },
+      tool_use_id: toolUseId,
+      permission_suggestions: [],
+    },
+  });
+  return { toolUseId, requestId, response };
+}
+
+function finish(toolUseId, decision) {
+  const answers = decision?.updatedInput?.answers ?? {};
+  write({
+    type: "user",
+    parent_tool_use_id: null,
+    session_id: sessionId,
+    uuid: NodeCrypto.randomUUID(),
+    message: {
+      role: "user",
+      content: [
+        {
+          type: "tool_result",
+          tool_use_id: toolUseId,
+          content:
+            decision?.behavior === "allow"
+              ? `User answered: ${JSON.stringify(answers)}`
+              : String(decision?.message ?? "denied"),
+        },
+      ],
+    },
+  });
+  const text = `Answer received: ${Object.values(answers).join(", ") || "none"}`;
+  write({
+    type: "assistant",
+    parent_tool_use_id: null,
+    session_id: sessionId,
+    uuid: NodeCrypto.randomUUID(),
+    message: {
+      id: "msg_done",
+      type: "message",
+      role: "assistant",
+      model,
+      content: [{ type: "text", text }],
+      stop_reason: "end_turn",
+      stop_sequence: null,
+      usage,
+    },
+  });
+  write({
+    type: "result",
+    subtype: "success",
+    is_error: false,
+    num_turns: 1,
+    result: text,
+    session_id: sessionId,
+    stop_reason: "end_turn",
+    usage,
+    total_cost_usd: 0,
+    duration_ms: 1,
+    duration_api_ms: 1,
+    uuid: NodeCrypto.randomUUID(),
+  });
+}
+
+async function runTurn(prompt) {
+  write({
+    type: "system",
+    subtype: "init",
+    session_id: sessionId,
+    cwd: process.cwd(),
+    tools: ["AskUserQuestion"],
+    model,
+    permissionMode: "bypassPermissions",
+    mcp_servers: [],
+    slash_commands: [],
+    uuid: NodeCrypto.randomUUID(),
+  });
+  if (typeof prompt.uuid === "string") {
+    write({ type: "command_lifecycle", command_uuid: prompt.uuid, state: "started" });
+  }
+  const q1 = ask(1);
+  switch (row) {
+    case "A1":
+    case "A2":
+      // The adapter interrupts then closes the query; the SDK's cleanup aborts
+      // the pending callback, so this process only waits to be shut down.
+      return;
+    case "A3":
+      await waitForFile(NodePath.join(traceDir, `${row}.die`));
+      process.stderr.write("fatal: fixture transport failure\n");
+      exit(1);
+      return;
+    case "A4": {
+      await waitForFile(NodePath.join(traceDir, `${row}.cancel`));
+      write({ type: "control_cancel_request", request_id: q1.requestId });
+      await q1.response;
+      const q2 = ask(2);
+      finish(q2.toolUseId, await q2.response);
+      return;
+    }
+    case "C": {
+      const decision = await q1.response;
+      // Stale: the SDK already settled this request when it sent the answer.
+      write({ type: "control_cancel_request", request_id: q1.requestId });
+      finish(q1.toolUseId, decision);
+      return;
+    }
+    default:
+      finish(q1.toolUseId, await q1.response);
+  }
+}
+
+for await (const line of NodeReadline.createInterface({ input: process.stdin })) {
+  if (!line.trim()) continue;
+  const frame = JSON.parse(line);
+  if (row === null && frame.type === "user") {
+    const text = JSON.stringify(frame.message?.content ?? "");
+    row = /ROW:([A-Z0-9]+)/.exec(text)?.[1] ?? "B";
+    traceDir = /TRACE:(\S+?)(?:\\n|\\"|"|\s|$)/.exec(text)?.[1] ?? null;
+    if (traceDir) {
+      NodeFS.mkdirSync(traceDir, { recursive: true });
+      traceFile = NodePath.join(traceDir, `${row}-${process.pid}.ndjson`);
+      NodeFS.appendFileSync(traceFile, pendingTrace.splice(0).join(""));
+    }
+  }
+  trace({ dir: "in", frame });
+  if (frame.type === "control_response") {
+    const requestId = frame.response?.request_id;
+    waiters.get(requestId)?.(frame.response?.response);
+    waiters.delete(requestId);
+    continue;
+  }
+  if (frame.type === "control_request") {
+    const subtype = frame.request?.subtype;
+    write({
+      type: "control_response",
+      response: {
+        subtype: "success",
+        request_id: frame.request_id,
+        response:
+          subtype === "initialize"
+            ? initializeResponse
+            : subtype === "mcp_set_servers"
+              ? { added: [], removed: [], errors: {} }
+              : {},
+      },
+    });
+    continue;
+  }
+  if (frame.type === "user" && frame.message?.role === "user") {
+    void runTurn(frame);
+  }
+}
+exit(0);
diff --git a/knip.jsonc b/knip.jsonc
index c2093737fd942..f37315da7650b 100644
--- a/knip.jsonc
+++ b/knip.jsonc
@@ -46,6 +46,7 @@
       "entry": [
         "src/bin.ts!",
         "src/claude-history-worker.ts!",
+        "scripts/claude-question-withdrawal-evidence.ts",
         "scripts/cli.ts",
         "scripts/fetch-expo-schema.ts",
         "scripts/probe-claude-fork-local-rollback-replay.ts",