diff --git a/src/chat-swarm-runtime.test.ts b/src/chat-swarm-runtime.test.ts
index 0bf022b7..7c275535 100644
--- a/src/chat-swarm-runtime.test.ts
+++ b/src/chat-swarm-runtime.test.ts
@@ -268,6 +268,75 @@ test("CDP prompt delivery keeps textarea fallback on the DOM value/input path",
   assert.equal(pageCommands, 0);
 });
 
+test("CDP managed conversation waits for the initialization turn to become idle before exposing identity", async () => {
+  const driver = cdpDriverForSelectorTest();
+  const calls: string[] = [];
+  const target = { id: "target-init", url: "https://chatgpt.com/g/g-p-runtime-test/project" };
+  (driver as any).ensureRuntime = async () => { calls.push("ensure-runtime"); };
+  (driver as any).newTarget = async () => { calls.push("new-target"); return target; };
+  (driver as any).waitForComposer = async () => { calls.push("composer-ready"); };
+  (driver as any).observeAppBinding = async () => { calls.push("app-binding"); return "READY"; };
+  (driver as any).sendPromptToTarget = async () => { calls.push("initialization-sent"); };
+  (driver as any).waitForConversationUrl = async () => {
+    calls.push("conversation-identity");
+    return "https://chatgpt.com/g/g-p-runtime-test/c/worker-init";
+  };
+  (driver as any).waitForConversationIdle = async (_target: unknown, expectedUrl: string) => {
+    calls.push(`idle:${expectedUrl}`);
+  };
+
+  const evidence = await driver.createManagedConversation(
+    "https://chatgpt.com/g/g-p-runtime-test/project",
+    new Date(Date.now() + 1_000).toISOString(),
+  );
+
+  assert.equal(evidence.conversationUrl, "https://chatgpt.com/g/g-p-runtime-test/c/worker-init");
+  assert.deepEqual(calls, [
+    "ensure-runtime",
+    "new-target",
+    "composer-ready",
+    "app-binding",
+    "initialization-sent",
+    "conversation-identity",
+    "idle:https://chatgpt.com/g/g-p-runtime-test/c/worker-init",
+  ]);
+});
+
+test("CDP initialization idle gate polls busy state and preserves exact-conversation fences", async () => {
+  const driver = cdpDriverForSelectorTest();
+  const expressions: string[] = [];
+  const states = ["BUSY", "IDLE"];
+  (driver as any).evaluate = async (_target: unknown, expression: string) => {
+    expressions.push(expression);
+    return states.shift();
+  };
+
+  await (driver as any).waitForConversationIdle(
+    { id: "target-init", url: "https://chatgpt.com/g/g-p-runtime-test/c/worker-init" },
+    "https://chatgpt.com/g/g-p-runtime-test/c/worker-init",
+    new Date(Date.now() + 1_000).toISOString(),
+  );
+
+  assert.equal(expressions.length, 2);
+  assert.match(expressions[0]!, /location\.href !== expectedUrl/);
+  assert.match(expressions[0]!, /data-message-author-role="assistant"/);
+  assert.match(expressions[0]!, /READY_FOR_BOOTSTRAP/);
+  assert.match(expressions[0]!, /stop \(generating\|streaming\)/);
+});
+
+test("CDP initialization idle gate fails closed on conversation drift", async () => {
+  const driver = cdpDriverForSelectorTest();
+  (driver as any).evaluate = async () => "DRIFT";
+  await assert.rejects(
+    () => (driver as any).waitForConversationIdle(
+      { id: "target-init", url: "https://chatgpt.com/g/g-p-runtime-test/c/worker-init" },
+      "https://chatgpt.com/g/g-p-runtime-test/c/worker-init",
+      new Date(Date.now() + 1_000).toISOString(),
+    ),
+    /CHATGPT_CONVERSATION_IDENTITY_DRIFT/,
+  );
+});
+
 function openCliDriverForTest() {
   return new OpenCliMacWebDriver({
     enabled: true,
diff --git a/src/chat-swarm-runtime.ts b/src/chat-swarm-runtime.ts
index 28e6abf0..3f6652bc 100644
--- a/src/chat-swarm-runtime.ts
+++ b/src/chat-swarm-runtime.ts
@@ -1933,6 +1933,7 @@ export class CdpMacWebDriver implements MacWebDriver {
       deadlineAt,
     );
     const conversationUrl = await this.waitForConversationUrl(target, deadlineAt);
+    await this.waitForConversationIdle(target, conversationUrl, deadlineAt);
     return {
       conversationUrl,
       conversationFingerprint: conversationFingerprintFromUrl(conversationUrl),
@@ -2292,6 +2293,25 @@ export class CdpMacWebDriver implements MacWebDriver {
     }
     throw new Error("ChatGPT conversation identity did not become observable before deadline");
   }
+
+  private async waitForConversationIdle(
+    target: CdpTarget,
+    expectedConversationUrl: string,
+    deadlineAt: string,
+  ): Promise<void> {
+    const expectedUrl = JSON.stringify(expectedConversationUrl);
+    while (Date.now() < Date.parse(deadlineAt)) {
+      const state = await this.evaluate<"IDLE" | "BUSY" | "SIGNED_OUT" | "DRIFT">(
+        target,
+        `(() => { const expectedUrl=${expectedUrl}; if(location.href !== expectedUrl) return 'DRIFT'; const visible=(el) => { const rect=el.getBoundingClientRect(); const style=getComputedStyle(el); return rect.width > 0 && rect.height > 0 && style.display !== 'none' && style.visibility !== 'hidden'; }; if ((location.pathname === '/auth' || location.pathname.startsWith('/auth/')) || [...document.querySelectorAll('a,button')].some(el => visible(el) && /^(log in|sign in)$/i.test(el.textContent?.trim()||''))) return 'SIGNED_OUT'; const generating=Boolean([...document.querySelectorAll('button')].find(el => visible(el) && ((el.getAttribute('data-testid')||'').includes('stop') || /stop (generating|streaming)/i.test(el.getAttribute('aria-label')||el.textContent||'')))); const composer=Boolean([...document.querySelectorAll('[contenteditable="true"]')].find(visible) || [...document.querySelectorAll('textarea')].find(visible)); const initialized=[...document.querySelectorAll('[data-message-author-role="assistant"]')].some(el => /(^|\\s)READY_FOR_BOOTSTRAP($|\\s)/.test((el.textContent||'').trim())); return !generating && composer && initialized ? 'IDLE' : 'BUSY'; })()`,
+      );
+      if (state === "SIGNED_OUT") throw new Error("CHATGPT_SIGNED_OUT");
+      if (state === "DRIFT") throw new Error("CHATGPT_CONVERSATION_IDENTITY_DRIFT");
+      if (state === "IDLE") return;
+      await new Promise((resolvePromise) => setTimeout(resolvePromise, 100));
+    }
+    throw new Error("ChatGPT initialization turn did not become idle before deadline");
+  }
 }
 
 function conversationIdFromUrl(value: string): string {