diff --git a/tests/runner-e2e/chat-catalog-domains/internal-timeline-verifier.test.ts b/tests/runner-e2e/chat-catalog-domains/internal-timeline-verifier.test.ts
new file mode 100644
index 00000000000..299e7fd0e26
--- /dev/null
+++ b/tests/runner-e2e/chat-catalog-domains/internal-timeline-verifier.test.ts
@@ -0,0 +1,113 @@
+import { createHash } from "node:crypto";
+import { afterEach, expect, it, vi } from "vitest";
+import type { ChatCatalogContext } from "../chat-catalog-contract.js";
+
+const port = vi.hoisted(() => ({ handler: undefined as any, providerToken: "", executed: [] as string[][], infrastructureFailure: false }));
+vi.mock("node:http", () => ({ createServer: (handler: unknown) => {
+  port.handler = handler;
+  return { closeAllConnections: vi.fn(), close: (done: () => void) => done() };
+} }));
+vi.mock("../../e2e/fetch-allowed-port.js", () => ({ listenOnFetchAllowedPort: async () => 43123 }));
+// Execute only the owning verifier's unchanged bounded Node command on synthetic
+// HTML; no server, browser, application or native agent process is started.
+vi.mock("node:child_process", async original => {
+  const actual = await original<typeof import("node:child_process")>();
+  return { ...actual, execFile: (...args: any[]) => {
+    port.executed.push(args[1]);
+    if (port.infrastructureFailure) { queueMicrotask(() => args[3](Object.assign(Error("synthetic command unavailable"), { code: "ENOENT" }))); return; }
+    return (actual.execFile as any)(...args);
+  } };
+});
+import { startTimelineVerifier } from "./internal-timeline-verifier.js";
+afterEach(() => { vi.restoreAllMocks(); vi.unstubAllGlobals(); });
+const broken = '<h1>Launch</h1><input id="email">';
+const repaired = '<h1>Launch</h1><label for="email">Email</label><input id="email">';
+type Options = { wrongTask?: boolean; foreignCompany?: boolean; wrongWorker?: boolean; wrongRun?: boolean;
+  stopped?: boolean; infrastructureFailure?: boolean; changedAfterCommand?: boolean; missingFile?: boolean; wrongFile?: boolean; badEncoding?: boolean; oversized?: boolean; changedCheckout?: boolean };
+function fixture(options: Options = {}) {
+  port.executed.splice(0); port.providerToken = ""; port.infrastructureFailure = options.infrastructureFailure ?? false;
+  let body = broken, reads = 0, taskReads = 0;
+  const current = () => ({ id: options.wrongTask ? "other" : "task", companyId: options.foreignCompany ? "foreign" : "company",
+    assigneeAgentId: options.wrongWorker ? "foreign-worker" : "worker", executionRunId: options.wrongRun || options.changedCheckout && reads > 0 || options.changedAfterCommand && taskReads > 2 ? "other-run" : "native" });
+  const agentDenied = vi.fn();
+  vi.stubGlobal("fetch", vi.fn(async (url: URL | string, init: RequestInit) => {
+    if (String(url).includes("/file-resources/content")) { agentDenied(); return new Response("Board access required", { status: 403 }); }
+    expect(new Headers(init.headers).get("authorization")).toBe("Bearer synthetic-worker-key");
+    taskReads++; return new Response(JSON.stringify(current()));
+  }));
+  const get = vi.fn(async (path: string) => {
+    expect(path).toBe("/api/issues/task/file-resources/content?workspace=execution&path=launch.html");
+    reads++;
+    if (options.missingFile) throw Error("Owned file absent");
+    return { resource: { kind: "file", title: options.wrongFile ? "foreign.html" : "launch.html", workspaceKind: "execution_workspace" },
+      content: { encoding: options.badEncoding ? "unknown" : "utf8", data: options.oversized ? "x".repeat(262_145) : body } };
+  });
+  const postSensitive = vi.fn(async (path: string, value: any) => {
+    if (path.includes("/keys")) return { id: "worker-key", token: "synthetic-worker-key" };
+    port.providerToken = value.credentialValues["credentials.authorization"];
+    return { connectionId: "connection", actions: { readOnly: [{ catalogEntryId: "verify" }] } };
+  });
+  const ctx = { input: { privateSecrets: [] as string[], fixtures: { company: { id: "company" } },
+    api: { baseURL: "https://fixture.test", get, postSensitive, post: vi.fn(async () => {}), putSensitive: vi.fn(async () => {}), delete: vi.fn(async () => {}) } },
+    allRuns: vi.fn(async () => [{ id: "native", companyId: "company", agentId: "worker", status: options.stopped ? "cancelled" : "running", runtimeMode: "native", contextSnapshot: { issueId: "task" } }]),
+  } as unknown as ChatCatalogContext;
+  async function call(token = port.providerToken, arguments_: Record<string, unknown> = {}) {
+    let status = 0, response = "";
+    const req = { headers: { authorization: `Bearer ${token}` }, async *[Symbol.asyncIterator]() { yield Buffer.from(JSON.stringify({ jsonrpc: "2.0", id: 1, method: "tools/call", params: { name: "verify_launch_html", arguments: arguments_ } })); } };
+    const res = { headersSent: false, writeHead(code: number) { status = code; this.headersSent = true; }, end(text = "") { response = text; } };
+    await port.handler(req, res);
+    return { status, body: response ? JSON.parse(response) : null };
+  }
+  return { ctx, get, call, agentDenied, setBody: (value: string) => { body = value; } };
+}
+it("actual verifier uses only authorized fixture read and executes genuine failed-then-repaired file checks", async () => {
+  const f = fixture(); const verifier = await startTimelineVerifier(f.ctx, "task", ["worker", "repair-worker"]);
+  try {
+    const failed = await f.call();
+    expect(failed.status).toBe(200); expect(failed.body.result.isError).toBe(true);
+    expect(verifier.receipts).toHaveLength(1); expect(verifier.receipts[0]!.exitCode).toBe(1);
+    expect(verifier.receipts[0]!.sha256).toBe(createHash("sha256").update(broken).digest("hex"));
+    f.setBody(repaired);
+    const passed = await f.call();
+    expect(passed.status).toBe(200); expect(passed.body.result.isError).toBe(false);
+    expect(verifier.receipts.map(row => row.exitCode)).toEqual([1, 0]);
+    expect(verifier.receipts[1]!.sha256).toBe(createHash("sha256").update(repaired).digest("hex"));
+    expect(port.executed).toHaveLength(2); expect(port.executed.every(argv => argv[0] === "-e")).toBe(true);
+    expect(f.get).toHaveBeenCalledTimes(2); expect(f.agentDenied).not.toHaveBeenCalled();
+  } finally { await verifier.close(); }
+});
+it.each([{ wrongTask: true }, { foreignCompany: true }, { wrongWorker: true }, { wrongRun: true }, { stopped: true },
+  { missingFile: true }, { wrongFile: true }, { badEncoding: true }, { oversized: true }, { changedCheckout: true }])("actual verifier refuses invalid scope/custody/content %j without a fabricated exit receipt", async options => {
+  const f = fixture(options); const verifier = await startTimelineVerifier(f.ctx, "task", ["worker"]);
+  try {
+    expect((await f.call()).status).toBe(502);
+    expect(verifier.receipts).toEqual([]);
+    expect(port.executed).toHaveLength(0);
+  } finally { await verifier.close(); }
+});
+it("provider authentication failure cannot invoke the fixture board reader", async () => {
+  const f = fixture(); const verifier = await startTimelineVerifier(f.ctx, "task", ["worker"]);
+  try { expect((await f.call("unrelated-token")).status).toBe(401); expect(f.get).not.toHaveBeenCalled(); expect(verifier.receipts).toEqual([]); }
+  finally { await verifier.close(); }
+});
+
+it("requested fake exit and path cannot replace the real fixed-file command outcome", async () => {
+  const f = fixture(); const verifier = await startTimelineVerifier(f.ctx, "task", ["worker"]);
+  try {
+    const result = await f.call(port.providerToken, { exitCode: 0, path: "foreign.html" });
+    expect(result.status).toBe(200);
+    expect(verifier.receipts).toHaveLength(1);
+    expect(verifier.receipts[0]).toMatchObject({ taskId: "task", runId: "native", filename: "launch.html", exitCode: 1 });
+    expect(f.get).toHaveBeenCalledExactlyOnceWith("/api/issues/task/file-resources/content?workspace=execution&path=launch.html");
+    expect(JSON.stringify(result.body)).not.toContain("synthetic-worker-key");
+    expect(JSON.stringify(result.body)).not.toContain(port.providerToken);
+  } finally { await verifier.close(); }
+});
+it.each([{ infrastructureFailure: true }, { changedAfterCommand: true }])("command infrastructure or post-command custody failure never fabricates a result %j", async options => {
+  const f = fixture(options); const verifier = await startTimelineVerifier(f.ctx, "task", ["worker"]);
+  try {
+    expect((await f.call()).status).toBe(502);
+    expect(port.executed).toHaveLength(1);
+    expect(verifier.receipts).toEqual([]);
+  } finally { await verifier.close(); }
+});
diff --git a/tests/runner-e2e/chat-catalog-domains/internal-timeline-verifier.ts b/tests/runner-e2e/chat-catalog-domains/internal-timeline-verifier.ts
index 81f8523bbe9..dcf5436870f 100644
--- a/tests/runner-e2e/chat-catalog-domains/internal-timeline-verifier.ts
+++ b/tests/runner-e2e/chat-catalog-domains/internal-timeline-verifier.ts
@@ -3,6 +3,7 @@ import { randomBytes, createHash } from "node:crypto";
 import { execFile } from "node:child_process";
 import { listenOnFetchAllowedPort } from "../../e2e/fetch-allowed-port.js";
 import type { ChatCatalogContext } from "../chat-catalog-contract.js";
+import type { WorkspaceFileContent } from "../../../packages/shared/src/types/workspace-file-resource.js";
 export interface VerificationReceipt { taskId: string; runId: string; filename: string; sha256: string; exitCode: number; checkedAt: string; command: string }
 /** Real owned verification service: reads actual product workspace bytes, then executes a real bounded command. */
 export async function startTimelineVerifier(ctx: ChatCatalogContext, taskId: string, agentIds: string[]) {
@@ -20,14 +21,35 @@ export async function startTimelineVerifier(ctx: ChatCatalogContext, taskId: str
       if (m.method === "tools/list") { reply(m.id, { tools: [{ name: "verify_launch_html", description: "Run the real accessible-heading and labeled-email-input check on the current launch.html task workspace file. Returns the actual command exit code and byte digest.", inputSchema: { type: "object", properties: {}, additionalProperties: false }, annotations: { readOnlyHint: true, destructiveHint: false } }] }); return; }
       if (m.method !== "tools/call" || m.params?.name !== "verify_launch_html") { res.writeHead(204); res.end(); return; }
       const get = async (path: string) => { const response = await fetch(new URL(path, ctx.input.api.baseURL), { headers: { Authorization: `Bearer ${key.token}` }, redirect: "error", signal: AbortSignal.timeout(15000) }); if (!response.ok) { await response.body?.cancel(); throw new Error("Verifier cannot read actual task workspace"); } return response.json(); };
-      const current = await get(`/api/issues/${taskId}`) as { executionRunId?: string; assigneeAgentId?: string };
-      if (!current.executionRunId || !agentIds.includes(current.assigneeAgentId ?? "")) throw new Error("No actual authorized native task checkout");
-      const file = await get(`/api/issues/${taskId}/file-resources/content?workspace=execution&path=launch.html`) as { content: { encoding: string; data: string } };
+      const checkout = async (expectedRunId?: string, expectedAgentId?: string) => {
+        // Worker credentials remain limited to ordinary task access. Only the
+        // trusted fixture reads the board-only file route after this live join.
+        const current = await get(`/api/issues/${taskId}`) as { id?: string; companyId?: string; executionRunId?: string; assigneeAgentId?: string };
+        const runs = await ctx.allRuns();
+        const live = runs.find(run => run.id === current.executionRunId);
+        if (current.id !== taskId || current.companyId !== ctx.input.fixtures.company.id || !current.executionRunId
+          || !agentIds.includes(current.assigneeAgentId ?? "") || !live || live.companyId !== current.companyId
+          || live.agentId !== current.assigneeAgentId || live.status !== "running" || live.runtimeMode !== "native"
+          || (live.contextSnapshot?.issueId !== taskId && live.contextSnapshot?.taskId !== taskId)
+          || expectedRunId !== undefined && current.executionRunId !== expectedRunId
+          || expectedAgentId !== undefined && current.assigneeAgentId !== expectedAgentId)
+          throw new Error("No actual authorized native task checkout");
+        return { runId: current.executionRunId, agentId: current.assigneeAgentId! };
+      };
+      const current = await checkout();
+      // Fixed owned task/file only: never pass board credentials to the model,
+      // provider, worker bearer, or a caller-selected URL/path.
+      const file = await ctx.input.api.get<WorkspaceFileContent>(`/api/issues/${taskId}/file-resources/content?workspace=execution&path=launch.html`);
+      if (file.resource?.kind !== "file" || file.resource.title !== "launch.html" || file.resource.workspaceKind !== "execution_workspace"
+        || !file.content || typeof file.content.data !== "string" || !["utf8", "base64"].includes(file.content.encoding))
+        throw new Error("Verifier cannot read actual owned launch file");
+      await checkout(current.runId, current.agentId);
       const bytes = file.content.encoding === "base64" ? Buffer.from(file.content.data, "base64") : Buffer.from(file.content.data);
       if (bytes.length > 262144) throw new Error("Oversized launch fixture");
       const script = "const s=Buffer.from(process.argv[1],'base64').toString();process.exit(/<h1[ >]/i.test(s)&&/<label[^>]*for=[\"']email[\"']/i.test(s)&&/<input[^>]*id=[\"']email[\"']/i.test(s)?0:1)";
       const exitCode = await new Promise<number>((resolve, reject) => execFile(process.execPath, ["-e", script, bytes.toString("base64")], { timeout: 10000, maxBuffer: 65536 }, error => { if (!error) resolve(0); else if (typeof error.code === "number") resolve(error.code); else reject(error); }));
-      const receipt = { taskId, runId: current.executionRunId, filename: "launch.html", sha256: createHash("sha256").update(bytes).digest("hex"), exitCode, checkedAt: new Date().toISOString(), command: "node accessible-heading-and-email-label-check" };
+      await checkout(current.runId, current.agentId);
+      const receipt = { taskId, runId: current.runId, filename: "launch.html", sha256: createHash("sha256").update(bytes).digest("hex"), exitCode, checkedAt: new Date().toISOString(), command: "node accessible-heading-and-email-label-check" };
       receipts.push(receipt); reply(m.id, { content: [{ type: "text", text: JSON.stringify(receipt) }], isError: exitCode !== 0 });
     } catch { if (!res.headersSent) res.writeHead(502); res.end(); }
   });