diff --git a/docs/design/README.md b/docs/design/README.md
index 7fe450f4..8f1318fa 100644
--- a/docs/design/README.md
+++ b/docs/design/README.md
@@ -15,6 +15,7 @@ These records predate [`Decision 0001`](../decisions/0001-documentation-and-evid
 - [`OPENPI_WEB_ARCHITECTURE.md`](OPENPI_WEB_ARCHITECTURE.md) — draft architecture, protocol boundaries, delivery phases, and visual direction for the local Web workbench
 - [`OPENPI_WEB_REACT_MVP.md`](OPENPI_WEB_REACT_MVP.md) — draft local validation design for a behavior-compatible React, Astryx, and Tailwind browser migration
 - [`OPENPI_WEB_DEV_PORT_CONFLICTS.md`](OPENPI_WEB_DEV_PORT_CONFLICTS.md) — draft local design for development-port fallback, strict explicit ports, startup diagnostics, and TUI `/web` error projection
+- [`WEB_SESSION_CREATION_TARGET.md`](WEB_SESSION_CREATION_TARGET.md) — stable receipt identity and fail-closed target binding for a newly created Web Session's model selection and first prompt
 - [`WEB_SLASH_COMMAND_DISCOVERY.md`](WEB_SLASH_COMMAND_DISCOVERY.md) — Pi-owned command discovery, bounded Web projection, availability policy, and Composer completion interaction
 - [`COMPLETION_INBOX.md`](COMPLETION_INBOX.md) — shared owner, epoch, consumption, retry, and receipt contract for background completions
 
diff --git a/docs/design/WEB_SESSION_CREATION_TARGET.md b/docs/design/WEB_SESSION_CREATION_TARGET.md
new file mode 100644
index 00000000..8cb946b3
--- /dev/null
+++ b/docs/design/WEB_SESSION_CREATION_TARGET.md
@@ -0,0 +1,86 @@
+# Web Session Creation Target Binding
+
+- Status: validated
+- Created: 2026-09-08
+- Verified: 2026-09-08
+- Source boundary: the implementation in this record's commit, based on
+  `upstream/main` at `0d17f4577fe31315fe6c95370d251bdb4e2413cf`
+- Related Issue: [#466](https://github.com/openpi-dev/openpi/issues/466)
+- Related PR: [#490](https://github.com/openpi-dev/openpi/pull/490)
+- Supersedes: none
+
+## Problem
+
+Creating a Web Session and sending its first prompt spans an HTTP creation
+receipt, snapshot refreshes, optional model selection, and prompt admission.
+Another browser tab can activate a different Session between those operations.
+If the browser discards the creation receipt and reads the target back from the
+latest snapshot, the original prompt can be sent to the other tab's active
+Session.
+
+The Host and runtime already reject prompts whose `sessionId` is not active.
+That guard cannot recover the user's intent after the browser has replaced the
+intended target with a different but currently valid Session id.
+
+## Decision
+
+The creation receipt carries three distinct facts:
+
+- `commandId` correlates the creation request and its events;
+- `sessionId` is the required stable target identity;
+- `sessionPath` is optional because a new Pi Session may not have a persisted
+  file before its first message.
+
+The Web store retains those facts as the target of the creation operation. A
+snapshot refresh may confirm the target but cannot replace it. Before model
+selection, after model selection, and before prompt admission, the store checks
+that both `currentSessionId` and the selected Session still match the receipt's
+`sessionId`. When the receipt included a path, the selected path must also
+match.
+
+If another tab changes the active Session, the operation stops without calling
+model selection or prompt admission. The Composer keeps its input because
+`sendPrompt` returns `false`; the store reports that the active Session changed.
+The Host's existing `SESSION_CONFLICT` validation and prompt `commandId`
+idempotency remain the final runtime boundaries.
+
+This is a browser admission context, not a second Session state machine. Pi's
+runtime and `SessionManager` remain authoritative for Session activation and
+persistence.
+
+## Evidence
+
+Validated tests cover:
+
+- a second tab becoming active between the creation receipt and snapshot;
+- creation and correlated SSE events before a Session has a persisted path;
+- draft model selection refusing to target the externally activated Session;
+- the runtime and Host returning the same stable Session identity;
+- existing Session selection, prompt retry, and model-selection races.
+
+Repository validation on 2026-09-08:
+
+- `bun run check` passed;
+- `bun run test` passed with 1,465 Node tests passed, 1 platform-specific test
+  skipped, and 134 Web tests passed;
+- `bun run test:web:e2e` passed 12/12. The new browser case starts the current
+  checkout's standalone Host and Pi runtime, delays the created Session's HTTP
+  receipt, switches the runtime through an independent request, suppresses the
+  SSE transition, and verifies that no prompt is retargeted. No model call was
+  made;
+- the local shell had no separately installed `pi` executable, so `pi list`
+  provenance for an installed package was unavailable. The browser test runs
+  `bin/openpi.js` directly from the named checkout instead.
+
+## Ablation
+
+An initial implementation recorded both the expected receipt identity and
+separate Session/path identities observed from creation events. Removing the
+observed-identity state left the merged Web store suite at 60/60: `commandId`
+already correlates the event stream, while the receipt's `sessionId` is the
+only target authority needed after HTTP completion. The redundant state was
+removed.
+
+Removing receipt-bound `sessionId` validation restores the reported failure:
+the snapshot can supply another tab's active Session as the first prompt target.
+That validation is therefore required.
diff --git a/tests/web/artifact-evidence.e2e.ts b/tests/web/artifact-evidence.e2e.ts
index 4226a370..e5617e1d 100644
--- a/tests/web/artifact-evidence.e2e.ts
+++ b/tests/web/artifact-evidence.e2e.ts
@@ -182,7 +182,10 @@ test("real file evidence, authenticated downloads, edits, refresh and failure st
     setModel: async () => {
       throw new Error("unused");
     },
-    newSession: async () => ({ cancelled: true }),
+    newSession: async () => ({
+      cancelled: true,
+      sessionId: runtime.sessionManager.getSessionId(),
+    }),
     switchSession: async () => ({ cancelled: true }),
     cancelTurn: async (options) => ({ ...options, state: "stale-turn" }),
     subscribe: (listener) => {
diff --git a/tests/web/artifact-host.test.ts b/tests/web/artifact-host.test.ts
index 170f1ac2..3bc2d1a8 100644
--- a/tests/web/artifact-host.test.ts
+++ b/tests/web/artifact-host.test.ts
@@ -25,7 +25,10 @@ test("artifact HTTP access authenticates, binds a Session, serves exact revision
     dispose: async () => undefined,
     sendPrompt: async () => ({ pendingFollowUps: 0 }),
     cancelTurn: async (options) => ({ ...options, state: "stale-turn" }),
-    newSession: async () => ({ cancelled: true }),
+    newSession: async () => ({
+      cancelled: true,
+      sessionId: runtime.sessionManager.getSessionId(),
+    }),
     switchSession: async () => ({ cancelled: true }),
     setModel: async () => {
       throw new Error("unused");
diff --git a/tests/web/openpi-web.e2e.ts b/tests/web/openpi-web.e2e.ts
index 57995c5f..ed13b1c1 100644
--- a/tests/web/openpi-web.e2e.ts
+++ b/tests/web/openpi-web.e2e.ts
@@ -1457,6 +1457,93 @@ test("workspace selection survives refresh and creates the exact native Session
   }
 });
 
+test("a delayed creation receipt never retargets the first prompt to another tab's Session", async ({
+  page,
+}) => {
+  const workspaceA = await mkdtemp(join(tmpdir(), "openpi-issue-466-a-"));
+  const workspaceB = await mkdtemp(join(tmpdir(), "openpi-issue-466-b-"));
+  const headers = {
+    Authorization: `Bearer ${token}`,
+    Origin: "http://127.0.0.1:57109",
+  };
+  const promptRequests: unknown[] = [];
+  let createdSessionId: string | undefined;
+  let externalSessionId: string | undefined;
+  try {
+    const importedA = await page.request.post("/api/workspaces", {
+      headers,
+      data: { path: workspaceA },
+    });
+    const importedB = await page.request.post("/api/workspaces", {
+      headers,
+      data: { path: workspaceB },
+    });
+    expect(importedA.status()).toBe(201);
+    expect(importedB.status()).toBe(201);
+    const { path: canonicalA } = await importedA.json();
+    const { path: canonicalB } = await importedB.json();
+    const workspaceNameA = canonicalA.split("/").at(-1);
+
+    await page.route("**/events?**", (route) =>
+      route.fulfill({
+        contentType: "text/event-stream",
+        body: ": heartbeat\n\n",
+      }),
+    );
+    await page.route("**/api/prompt", async (route) => {
+      promptRequests.push(route.request().postDataJSON());
+      await route.fulfill({
+        status: 202,
+        json: {
+          id: route.request().postDataJSON().commandId,
+          accepted: true,
+        },
+      });
+    });
+    await page.route("**/api/sessions", async (route) => {
+      const createdResponse = await route.fetch();
+      const created = await createdResponse.json();
+      createdSessionId = created.sessionId;
+      const external = await page.request.post("/api/sessions", {
+        headers,
+        data: {
+          workspacePath: canonicalB,
+          commandId: "external-tab-switch",
+        },
+      });
+      expect(external.status()).toBe(201);
+      externalSessionId = (await external.json()).sessionId;
+      await route.fulfill({ response: createdResponse, json: created });
+    });
+
+    await openWorkbench(page);
+    const picker = page.locator(".workspace-picker");
+    await picker.click();
+    await page
+      .getByRole("menuitem", { name: workspaceNameA, exact: true })
+      .click();
+    const composer = page.getByRole("textbox", { name: "描述任务" });
+    await composer.fill("Only edit repository A");
+    await page.getByRole("button", { name: "发送", exact: true }).click();
+
+    await expect(page.locator(".notice")).toContainText("no longer active");
+    await expect(composer).toHaveValue("Only edit repository A");
+    expect(promptRequests).toEqual([]);
+    expect(createdSessionId).toEqual(expect.any(String));
+    expect(externalSessionId).toEqual(expect.any(String));
+    expect(createdSessionId).not.toBe(externalSessionId);
+    const snapshot = await page.request.get("/api/snapshot", { headers });
+    expect((await snapshot.json()).currentSessionId).toBe(externalSessionId);
+  } finally {
+    await page.close();
+    await Promise.all(
+      [workspaceA, workspaceB].map((path) =>
+        rm(path, { recursive: true, force: true }),
+      ),
+    );
+  }
+});
+
 test.describe("thinking picker", () => {
   test("disables thinking when the runtime reports it unsupported", async ({
     page,
diff --git a/tests/web/pi-adapter.test.ts b/tests/web/pi-adapter.test.ts
index a8c30e3c..83ed87d4 100644
--- a/tests/web/pi-adapter.test.ts
+++ b/tests/web/pi-adapter.test.ts
@@ -35,7 +35,10 @@ function runtimeFor(
     getActiveTurn: () => undefined,
     cancelTurn: async (options) => ({ ...options, state: "stale-turn" }),
     sendPrompt: async () => ({ pendingFollowUps: 0 }),
-    newSession: async () => ({ cancelled: false }),
+    newSession: async () => ({
+      cancelled: false,
+      sessionId: sessionManager.getSessionId(),
+    }),
     switchSession: async () => ({ cancelled: false }),
     listModels: () => [],
     searchModels: (query, limit) => projectWebModelSearch([], query, limit),
diff --git a/tests/web/pi-runtime.test.ts b/tests/web/pi-runtime.test.ts
index 27258c80..32f33898 100644
--- a/tests/web/pi-runtime.test.ts
+++ b/tests/web/pi-runtime.test.ts
@@ -1215,7 +1215,7 @@ test("dispose waits for pending candidate creation and cleans it before releasin
   }
 });
 
-test("new session projects its command id and activated session path", async () => {
+test("new session projects its command id and stable activated identity", async () => {
   const active = lifecycleRuntime(lifecycleSession("session-a", false));
   const candidateSession = lifecycleSession("session-b", false, 0);
   Object.assign(candidateSession.sessionManager, {
@@ -1250,12 +1250,31 @@ test("new session projects its command id and activated session path", async ()
     assert.deepEqual(result, {
       cancelled: false,
       commandId: "create-command",
+      sessionId: "session-b",
       sessionPath: "/tmp/session-b.jsonl",
     });
+    const eventCount = events.length;
+    const replay = await harness.newSession(process.cwd(), {
+      commandId: "create-command",
+    });
+    assert.deepEqual(replay, { ...result, replayed: true });
+    assert.equal(
+      events.length,
+      eventCount,
+      "receipt replay must not activate another Session",
+    );
+    await assert.rejects(
+      harness.newSession("/different-workspace", {
+        commandId: "create-command",
+      }),
+      /another workspace/,
+    );
+
     assert.deepEqual(events.at(-1), {
       type: "session_switched",
       detail: {
         commandId: "create-command",
+        sessionId: "session-b",
         sessionPath: "/tmp/session-b.jsonl",
       },
     });
diff --git a/tests/web/web-host.test.ts b/tests/web/web-host.test.ts
index ef5566e4..6cccdb40 100644
--- a/tests/web/web-host.test.ts
+++ b/tests/web/web-host.test.ts
@@ -127,6 +127,7 @@ test("serves workspaces through a runtime isolated from terminal sessions", asyn
       for (const listener of listeners) listener({ type: "session_start" });
       return {
         cancelled: false,
+        sessionId: sessionManager.getSessionId(),
         ...(options?.commandId ? { commandId: options.commandId } : {}),
       };
     },
@@ -859,7 +860,11 @@ test("serves workspaces through a runtime isolated from terminal sessions", asyn
       }),
     });
     assert.equal(importedSession.status, 201);
-    assert.equal((await importedSession.json()).commandId, "create-imported");
+    assert.deepEqual(await importedSession.json(), {
+      cancelled: false,
+      commandId: "create-imported",
+      sessionId: sessionManager.getSessionId(),
+    });
     assert.equal(runtimeCwd, importedWorkspace.path);
 
     const newSession = await fetch(`${launched.origin}/api/sessions`, {
@@ -868,10 +873,46 @@ test("serves workspaces through a runtime isolated from terminal sessions", asyn
       body: JSON.stringify({ workspacePath: cwd, commandId: "create-current" }),
     });
     assert.equal(newSession.status, 201);
-    assert.equal((await newSession.json()).commandId, "create-current");
+    assert.deepEqual(await newSession.json(), {
+      cancelled: false,
+      commandId: "create-current",
+      sessionId: sessionManager.getSessionId(),
+    });
     assert.equal(runtimeCwd, cwd);
     assert.equal(newSessions, 2);
     assert.deepEqual(creationCommandIds, ["create-imported", "create-current"]);
+    const beforeReplay = (await (
+      await fetch(`${launched.origin}/api/snapshot`, { headers: authorized })
+    ).json()) as { cursor: number };
+    const originalNewSession = runtime.newSession;
+    runtime.newSession = async (_workspacePath, options) => ({
+      cancelled: false,
+      replayed: true,
+      commandId: options?.commandId,
+      sessionId: "older-session",
+    });
+    try {
+      const replay = await fetch(`${launched.origin}/api/sessions`, {
+        method: "POST",
+        headers: authorized,
+        body: JSON.stringify({
+          workspacePath: importedWorkspace.path,
+          commandId: "create-imported",
+        }),
+      });
+      assert.equal(replay.status, 201);
+      const afterReplay = (await (
+        await fetch(`${launched.origin}/api/snapshot`, { headers: authorized })
+      ).json()) as { cursor: number };
+      assert.equal(
+        afterReplay.cursor,
+        beforeReplay.cursor,
+        "a replay is not a new Session transition",
+      );
+      assert.equal(runtimeCwd, cwd);
+    } finally {
+      runtime.newSession = originalNewSession;
+    }
 
     const removeActive = await fetch(
       `${launched.origin}/api/workspaces?path=${encodeURIComponent(cwd)}`,
@@ -992,7 +1033,10 @@ test("serves terminal Sessions through a read-only bounded endpoint", async () =
     getActiveTurn: () => undefined,
     cancelTurn: async (options) => ({ ...options, state: "stale-turn" }),
     sendPrompt: async () => ({ pendingFollowUps: 0 }),
-    newSession: async () => ({ cancelled: false }),
+    newSession: async () => ({
+      cancelled: false,
+      sessionId: runtime.sessionManager.getSessionId(),
+    }),
     switchSession: async () => ({ cancelled: false }),
     listModels: () => [],
     searchModels: (query, limit) => projectWebModelSearch([], query, limit),
@@ -1126,7 +1170,10 @@ test("an unbound Host exposes no bootstrap Session and rejects prompt bypasses",
       prompts++;
       return { pendingFollowUps: 0 };
     },
-    newSession: async () => ({ cancelled: false }),
+    newSession: async () => ({
+      cancelled: false,
+      sessionId: sessionManager.getSessionId(),
+    }),
     switchSession: async () => ({ cancelled: false }),
     listModels: () => [],
     searchModels: (query, limit) => projectWebModelSearch([], query, limit),
@@ -1227,7 +1274,10 @@ test("returns accepted only after Pi admits the prompt", async () => {
       await promptAdmitted;
       return { pendingFollowUps: 0 };
     },
-    newSession: async () => ({ cancelled: false }),
+    newSession: async () => ({
+      cancelled: false,
+      sessionId: sessionManager.getSessionId(),
+    }),
     switchSession: async () => ({ cancelled: false }),
     listModels: () => [],
     searchModels: (query, limit) => projectWebModelSearch([], query, limit),
@@ -1715,7 +1765,10 @@ function testRuntime(
     getActiveTurn: () => undefined,
     cancelTurn: async (options) => ({ ...options, state: "stale-turn" }),
     sendPrompt,
-    newSession: async () => ({ cancelled: false }),
+    newSession: async () => ({
+      cancelled: false,
+      sessionId: sessionManager.getSessionId(),
+    }),
     switchSession: async () => ({ cancelled: false }),
     listModels: () => [],
     searchModels: (query, limit) => projectWebModelSearch([], query, limit),
diff --git a/tests/web/web-store.spec.ts b/tests/web/web-store.spec.ts
index ec3f912b..e4ee7e3a 100644
--- a/tests/web/web-store.spec.ts
+++ b/tests/web/web-store.spec.ts
@@ -11,6 +11,7 @@ import type {
 } from "../../web/protocol/types.ts";
 import {
   type CommandReceipt,
+  type SessionCreationResult,
   type SessionMutationResult,
   WebApiError,
   WebClient,
@@ -148,9 +149,9 @@ class FakeClient extends WebClient {
   workspaceResult: Promise<WorkspaceSelectionResult> = Promise.resolve({
     cancelled: true,
   });
-  creationResult: Promise<SessionMutationResult> = Promise.resolve({
-    sessionPath: "/tmp/ws/session.jsonl",
-  });
+  creationResult:
+    | ((commandId: string) => Promise<SessionCreationResult>)
+    | null = null;
   selectionResults: Array<Promise<SessionMutationResult>> = [];
   modelResult: Promise<WebModelSummary> = Promise.resolve({
     provider: "test",
@@ -204,7 +205,14 @@ class FakeClient extends WebClient {
 
   override createSession(workspacePath: string, commandId: string) {
     this.creations.push({ commandId, workspacePath });
-    return this.creationResult;
+    return (
+      this.creationResult?.(commandId) ??
+      Promise.resolve({
+        cancelled: false,
+        commandId,
+        sessionId: "session-1",
+      })
+    );
   }
 
   override selectSession(path: string) {
@@ -771,6 +779,29 @@ describe("OpenPI Web store", () => {
     store.getState().actions.stop();
   });
 
+  it("preserves a business notice when the event stream reconnects", async () => {
+    const client = new FakeClient();
+    client.snapshots.push(Promise.resolve(snapshot()));
+    let connected: (() => void) | undefined;
+    const consumeEvents = vi.fn((options: EventStreamOptions) => {
+      connected = options.onConnected;
+      return new Promise<void>((resolve) => {
+        options.signal.addEventListener("abort", () => resolve(), {
+          once: true,
+        });
+      });
+    });
+    const store = createWebStore(client, { consumeEvents });
+    await store.getState().actions.refreshSnapshot();
+    store.getState().actions.start();
+    await vi.waitFor(() => expect(connected).toBeDefined());
+    store.setState({ notice: "The created Session is no longer active." });
+    connected?.();
+    expect(store.getState().connection).toBe("connected");
+    expect(store.getState().notice).toContain("no longer active");
+    store.getState().actions.stop();
+  });
+
   it("projects prompt admission optimistically and settles on the receipt", async () => {
     const client = new FakeClient();
     client.snapshots.push(Promise.resolve(snapshot()));
@@ -1123,8 +1154,8 @@ describe("OpenPI Web store", () => {
       Promise.resolve(snapshot()),
       Promise.resolve(activeSnapshot("session-2", "/tmp/ws/b.jsonl")),
     );
-    const creation = deferred<SessionMutationResult>();
-    client.creationResult = creation.promise;
+    const creation = deferred<SessionCreationResult>();
+    client.creationResult = () => creation.promise;
     client.selectionResults.push(Promise.resolve({}));
     const store = createWebStore(client);
     await store.getState().actions.refreshSnapshot();
@@ -1132,7 +1163,11 @@ describe("OpenPI Web store", () => {
     const creating = store.getState().actions.createSession("/tmp/ws");
     await vi.waitFor(() => expect(client.creations).toHaveLength(1));
     const selecting = store.getState().actions.selectSession("/tmp/ws/b.jsonl");
-    creation.resolve({});
+    creation.resolve({
+      cancelled: false,
+      commandId: client.creations[0]!.commandId,
+      sessionId: "session-1",
+    });
     await Promise.all([creating, selecting]);
 
     expect(client.selections).toEqual(["/tmp/ws/b.jsonl"]);
@@ -1149,8 +1184,8 @@ describe("OpenPI Web store", () => {
         activeSnapshot("session-2", "/tmp/ws/created.jsonl", { cursor: 5 }),
       ),
     );
-    const creation = deferred<SessionMutationResult>();
-    client.creationResult = creation.promise;
+    const creation = deferred<SessionCreationResult>();
+    client.creationResult = () => creation.promise;
     const stream = eventStreamHarness();
     const store = createWebStore(client, {
       consumeEvents: stream.consumeEvents,
@@ -1168,7 +1203,12 @@ describe("OpenPI Web store", () => {
         sessionPath: "/tmp/ws/created.jsonl",
       }),
     );
-    creation.resolve({ sessionPath: "/tmp/ws/created.jsonl" });
+    creation.resolve({
+      cancelled: false,
+      commandId,
+      sessionId: "session-2",
+      sessionPath: "/tmp/ws/created.jsonl",
+    });
     await creating;
 
     const prompt = deferred<CommandReceipt>();
@@ -1190,6 +1230,48 @@ describe("OpenPI Web store", () => {
     store.getState().actions.stop();
   });
 
+  it("correlates creation events by Session identity before persistence", async () => {
+    const client = new FakeClient();
+    client.snapshots.push(
+      Promise.resolve(unboundSnapshot()),
+      Promise.resolve(activeSnapshot("session-new", "current:session-new")),
+    );
+    const creation = deferred<SessionCreationResult>();
+    client.creationResult = () => creation.promise;
+    const stream = eventStreamHarness();
+    const store = createWebStore(client, {
+      consumeEvents: stream.consumeEvents,
+    });
+    await store.getState().actions.refreshSnapshot();
+    store.getState().actions.start();
+
+    const creating = store.getState().actions.createSession("/tmp/ws");
+    await vi.waitFor(() => expect(client.creations).toHaveLength(1));
+    const commandId = client.creations[0]!.commandId;
+    stream.emit(
+      runtimeEvent(5, "session_switched", {
+        commandId,
+        sessionId: "session-new",
+      }),
+    );
+    stream.emit(
+      runtimeEvent(6, "session_created", {
+        commandId,
+        sessionId: "session-new",
+      }),
+    );
+    creation.resolve({
+      cancelled: false,
+      commandId,
+      sessionId: "session-new",
+    });
+
+    expect(await creating).toMatchObject({ sessionId: "session-new" });
+    expect(store.getState().selectedPath).toBe("current:session-new");
+    expect(store.getState().notice).toBeNull();
+    store.getState().actions.stop();
+  });
+
   it("lets an external activation supersede queued Session creation", async () => {
     const client = new FakeClient();
     client.snapshots.push(
@@ -1268,7 +1350,10 @@ describe("OpenPI Web store", () => {
       ),
     );
     client.workspaceResult = Promise.resolve({ path: workspace });
-    client.creationResult = Promise.resolve({
+    client.creationResult = async (commandId) => ({
+      cancelled: false,
+      commandId,
+      sessionId: "session-1",
       sessionPath: `${workspace}/session.jsonl`,
     });
     const store = createWebStore(client);
@@ -1311,7 +1396,10 @@ describe("OpenPI Web store", () => {
 
   it("creates a Session in the chosen workspace before sending from an old empty Session", async () => {
     const client = new FakeClient();
-    client.creationResult = Promise.resolve({
+    client.creationResult = async (commandId) => ({
+      cancelled: false,
+      commandId,
+      sessionId: "session-b",
       sessionPath: "/tmp/repo-b/session.jsonl",
     });
     client.snapshots.push(
@@ -1336,6 +1424,81 @@ describe("OpenPI Web store", () => {
     store.getState().actions.stop();
   });
 
+  it("never retargets the first prompt to a Session activated by another tab", async () => {
+    const client = new FakeClient();
+    const workspaceA = "/tmp/repo-a";
+    const workspaceB = "/tmp/repo-b";
+    client.snapshots.push(
+      Promise.resolve(
+        unboundSnapshot([
+          { path: workspaceA, name: "A", current: false },
+          { path: workspaceB, name: "B", current: false },
+        ]),
+      ),
+      Promise.resolve(
+        activeSnapshot("session-b", `${workspaceB}/session.jsonl`, {
+          workspace: workspaceB,
+        }),
+      ),
+    );
+    const store = createWebStore(client);
+    await store.getState().actions.refreshSnapshot();
+    store.getState().actions.setWorkspace(workspaceA);
+    client.creationResult = async (commandId) => ({
+      cancelled: false,
+      commandId,
+      sessionId: "session-a",
+    });
+
+    expect(
+      await store
+        .getState()
+        .actions.sendPrompt("Edit repository A configuration"),
+    ).toBe(false);
+
+    expect(client.prompts).toEqual([]);
+    expect(store.getState().snapshot?.currentSessionId).toBe("session-b");
+    expect(store.getState().notice).toContain("no longer active");
+    expect(store.getState().workspaceDraft).toBe(true);
+    const previousCommandId = client.creations[0].commandId;
+    client.snapshots.push(
+      Promise.resolve(
+        activeSnapshot("session-a", `${workspaceA}/session.jsonl`, {
+          workspace: workspaceA,
+        }),
+      ),
+    );
+    expect(await store.getState().actions.sendPrompt("retry in A")).toBe(true);
+    expect(client.creations[1].commandId).not.toBe(previousCommandId);
+    expect(client.prompts).toEqual([
+      { sessionId: "session-a", content: "retry in A" },
+    ]);
+  });
+
+  it("binds a first prompt to a new Session before it has a persisted path", async () => {
+    const client = new FakeClient();
+    const workspace = "/tmp/ws";
+    client.snapshots.push(
+      Promise.resolve(
+        unboundSnapshot([{ path: workspace, name: "WS", current: false }]),
+      ),
+      Promise.resolve(activeSnapshot("session-new", "current:session-new")),
+    );
+    client.creationResult = async (commandId) => ({
+      cancelled: false,
+      commandId,
+      sessionId: "session-new",
+    });
+    const store = createWebStore(client);
+    await store.getState().actions.refreshSnapshot();
+    store.getState().actions.setWorkspace(workspace);
+
+    expect(await store.getState().actions.sendPrompt("first task")).toBe(true);
+    expect(client.prompts).toEqual([
+      { sessionId: "session-new", content: "first task" },
+    ]);
+  });
+
   it("keeps a running agent active when a handled follow-up settles", async () => {
     const client = new FakeClient();
     client.snapshots.push(Promise.resolve(snapshot()));
@@ -1867,6 +2030,30 @@ describe("draft model selection", () => {
     store.getState().actions.stop();
   });
 
+  it("does not apply a draft model to a Session activated by another tab", async () => {
+    const { client, store } = draftHarness();
+    await store.getState().actions.selectModel("test/model");
+    store.getState().actions.setWorkspace("/tmp/repo-a");
+    client.snapshots.push(
+      Promise.resolve(
+        activeSnapshot("session-b", "/tmp/repo-b/session.jsonl", {
+          workspace: "/tmp/repo-b",
+        }),
+      ),
+    );
+    client.creationResult = async (commandId) => ({
+      cancelled: false,
+      commandId,
+      sessionId: "session-a",
+    });
+
+    expect(await store.getState().actions.sendPrompt("hello A")).toBe(false);
+    expect(client.modelSelections).toEqual([]);
+    expect(client.prompts).toEqual([]);
+    expect(store.getState().draftModel?.id).toBe("model");
+    expect(store.getState().notice).toContain("no longer active");
+  });
+
   it("blocks fallback on unavailable model and retries using the already-created Session", async () => {
     const { client, store } = draftHarness();
     await store.getState().actions.selectModel("test/model");
@@ -1921,8 +2108,8 @@ describe("draft model selection", () => {
     const { client, store } = draftHarness();
     await store.getState().actions.selectModel("test/model");
     store.setState({ selectedWorkspace: "/tmp/ws" });
-    const creation = deferred<SessionMutationResult>();
-    client.creationResult = creation.promise;
+    const creation = deferred<SessionCreationResult>();
+    client.creationResult = () => creation.promise;
     const sending = store.getState().actions.sendPrompt("hello");
     await vi.waitFor(() => expect(client.creations).toHaveLength(1));
     client.snapshots.push(
@@ -1931,7 +2118,11 @@ describe("draft model selection", () => {
     const selecting = store
       .getState()
       .actions.selectSession("/tmp/ws/other.jsonl");
-    creation.resolve({});
+    creation.resolve({
+      cancelled: false,
+      commandId: client.creations[0]!.commandId,
+      sessionId: "session-1",
+    });
     expect(await sending).toBe(false);
     await selecting;
     expect(client.prompts).toHaveLength(0);
@@ -1964,8 +2155,8 @@ describe("workspace selection authority", () => {
     expect(await refreshing).toBe(false);
     expect(store.getState().selectedWorkspace).toBe(workspace);
 
-    const creation = deferred<SessionMutationResult>();
-    client.creationResult = creation.promise;
+    const creation = deferred<SessionCreationResult>();
+    client.creationResult = () => creation.promise;
     client.snapshots.push(
       Promise.resolve(activeSnapshot("b", sessionPath, { workspace })),
     );
@@ -1974,7 +2165,12 @@ describe("workspace selection authority", () => {
     expect(store.getState().sessionSwitching).toBe(true);
     expect(await store.getState().actions.sendPrompt("duplicate")).toBe(false);
     expect(client.prompts).toEqual([]);
-    creation.resolve({ sessionPath });
+    creation.resolve({
+      cancelled: false,
+      commandId: client.creations[0]!.commandId,
+      sessionId: "b",
+      sessionPath,
+    });
     expect(await sending).toBe(true);
     expect(client.prompts).toEqual([{ sessionId: "b", content: "B only" }]);
     store.getState().actions.stop();
@@ -1992,10 +2188,38 @@ describe("workspace selection authority", () => {
     expect(client.prompts).toEqual([]);
   });
 
+  it("reuses the creation command after activation succeeded but its response was lost", async () => {
+    const { client, store } = await harness();
+    store.getState().actions.setWorkspace(workspace);
+    const activated = activeSnapshot("b", sessionPath, { workspace });
+    client.creationResult = async () => {
+      throw new Error("response lost");
+    };
+    client.snapshots.push(Promise.resolve(activated));
+    expect(await store.getState().actions.sendPrompt("B only")).toBe(false);
+    const originalCommand = client.creations[0]!.commandId;
+    client.creationResult = async (commandId) => ({
+      cancelled: false,
+      commandId,
+      sessionId: "b",
+      sessionPath,
+    });
+    client.snapshots.push(Promise.resolve(activated));
+    expect(await store.getState().actions.sendPrompt("B only")).toBe(true);
+    expect(client.creations.map((call) => call.commandId)).toEqual([
+      originalCommand,
+      originalCommand,
+    ]);
+    expect(client.prompts).toEqual([{ sessionId: "b", content: "B only" }]);
+    store.getState().actions.stop();
+  });
+
   it("retains B on creation failure and retries without falling back to A", async () => {
     const { client, initial, store } = await harness();
     store.getState().actions.setWorkspace(workspace);
-    client.creationResult = Promise.reject(new Error("creation failed"));
+    client.creationResult = async () => {
+      throw new Error("creation failed");
+    };
     client.snapshots.push(Promise.resolve(initial));
     expect(await store.getState().actions.sendPrompt("B only")).toBe(false);
     expect(store.getState().notice).toBe("creation failed");
@@ -2003,7 +2227,12 @@ describe("workspace selection authority", () => {
     expect(store.getState().workspaceDraft).toBe(true);
     expect(client.prompts).toEqual([]);
 
-    client.creationResult = Promise.resolve({ sessionPath });
+    client.creationResult = async (commandId) => ({
+      cancelled: false,
+      commandId,
+      sessionId: "b",
+      sessionPath,
+    });
     client.snapshots.push(
       Promise.resolve(activeSnapshot("b", sessionPath, { workspace })),
     );
@@ -2011,16 +2240,19 @@ describe("workspace selection authority", () => {
     expect(
       client.creations.every((call) => call.workspacePath === workspace),
     ).toBe(true);
+    expect(new Set(client.creations.map((call) => call.commandId)).size).toBe(
+      1,
+    );
     expect(client.prompts).toEqual([{ sessionId: "b", content: "B only" }]);
     store.getState().actions.stop();
   });
 
   it("rechecks creation when a newer snapshot supersedes its confirmation", async () => {
     const { client, store } = await harness();
-    const creation = deferred<SessionMutationResult>();
+    const creation = deferred<SessionCreationResult>();
     const slowConfirmation = deferred<WebSnapshot>();
     const active = activeSnapshot("b", sessionPath, { workspace });
-    client.creationResult = creation.promise;
+    client.creationResult = () => creation.promise;
     client.snapshots.push(
       slowConfirmation.promise,
       Promise.resolve(active),
@@ -2030,7 +2262,12 @@ describe("workspace selection authority", () => {
 
     const sending = store.getState().actions.sendPrompt("B only");
     await vi.waitFor(() => expect(client.creations).toHaveLength(1));
-    creation.resolve({ sessionPath });
+    creation.resolve({
+      cancelled: false,
+      commandId: client.creations[0]!.commandId,
+      sessionId: "b",
+      sessionPath,
+    });
     await vi.waitFor(() => expect(client.snapshotPaths).toHaveLength(2));
 
     expect(await store.getState().actions.refreshSnapshot()).toBe(true);
@@ -2046,14 +2283,18 @@ describe("workspace selection authority", () => {
   it.each([
     {
       name: "cancelled creation",
-      receipt: { cancelled: true },
+      receipt: { cancelled: true, sessionId: "b" },
       next: snapshot(),
     },
     { name: "missing creation identity", receipt: {}, next: snapshot() },
-    { name: "different workspace", receipt: { sessionPath }, next: snapshot() },
+    {
+      name: "different workspace",
+      receipt: { cancelled: false, sessionId: "b", sessionPath },
+      next: snapshot(),
+    },
     {
       name: "different Session in B",
-      receipt: { sessionPath },
+      receipt: { cancelled: false, sessionId: "b", sessionPath },
       next: activeSnapshot("other", `${workspace}/other.jsonl`, { workspace }),
     },
   ])(
@@ -2061,7 +2302,8 @@ describe("workspace selection authority", () => {
     async ({ receipt, next }) => {
       const { client, store } = await harness();
       store.getState().actions.setWorkspace(workspace);
-      client.creationResult = Promise.resolve(receipt);
+      client.creationResult = async (commandId) =>
+        ({ commandId, ...receipt }) as SessionCreationResult;
       client.snapshots.push(Promise.resolve(next), Promise.resolve(next));
       expect(await store.getState().actions.sendPrompt("B only")).toBe(false);
       expect(client.prompts).toEqual([]);
@@ -2085,13 +2327,18 @@ describe("workspace selection authority", () => {
 
   it("never sends an in-flight B draft after the user chooses C", async () => {
     const { client, store } = await harness();
-    const creation = deferred<SessionMutationResult>();
-    client.creationResult = creation.promise;
+    const creation = deferred<SessionCreationResult>();
+    client.creationResult = () => creation.promise;
     store.getState().actions.setWorkspace(workspace);
     const sending = store.getState().actions.sendPrompt("B only");
     await vi.waitFor(() => expect(client.creations).toHaveLength(1));
     store.getState().actions.setWorkspace("/tmp/repo-c");
-    creation.resolve({ sessionPath });
+    creation.resolve({
+      cancelled: false,
+      commandId: client.creations[0]!.commandId,
+      sessionId: "b",
+      sessionPath,
+    });
     expect(await sending).toBe(false);
     expect(store.getState().selectedWorkspace).toBe("/tmp/repo-c");
     expect(store.getState().workspaceDraft).toBe(true);
@@ -2117,7 +2364,12 @@ describe("workspace selection authority", () => {
     expect(store.getState().selectedWorkspace).toBe("/tmp/ws");
     expect(store.getState().workspaceDraft).toBe(true);
     const createdPath = "/tmp/ws/fresh.jsonl";
-    client.creationResult = Promise.resolve({ sessionPath: createdPath });
+    client.creationResult = async (commandId) => ({
+      cancelled: false,
+      commandId,
+      sessionId: "fresh",
+      sessionPath: createdPath,
+    });
     client.snapshots.push(
       Promise.resolve(activeSnapshot("fresh", createdPath)),
     );
diff --git a/web/dist/app.js b/web/dist/app.js
index 99cbf714..105c1944 100644
--- a/web/dist/app.js
+++ b/web/dist/app.js
@@ -94,4 +94,4 @@ Try polyfilling it using "@formatjs/intl-pluralrules"
 `,t);continue}let r=e.charCodeAt(t);if(Jx(e,t,r)){let r=e.charCodeAt(t+5)===Gx?t+6:t+5,o=e.slice(r,n);if(f===0&&e.charCodeAt(n+1)===Ux){u!==void 0&&a?.(u),i?.({id:u,event:p,data:o}),u=void 0,d=``,p=void 0,t=n+2,n=e.indexOf(`
 `,t);continue}d=f===0?o:`${d}\n${o}`,f++}else Yx(e,t,r)?p=e.slice(e.charCodeAt(t+6)===Gx?t+7:t+6,n)||void 0:C(e,t,n);t=n+1,n=e.indexOf(`
 `,t)}return e.slice(t)}for(;t<e.length;){let n=e.indexOf(`\r`,t),r=e.indexOf(`
-`,t),i=-1;if(n!==-1&&r!==-1?i=n<r?n:r:n===-1?r!==-1&&(i=r):i=n===e.length-1?-1:n,i===-1)break;C(e,t,i),t=i+1,e.charCodeAt(t-1)===Wx&&e.charCodeAt(t)===Ux&&t++}return e.slice(t)}function C(e,t,r){if(t===r){T();return}let i=e.charCodeAt(t);if(Jx(e,t,i)){let n=e.charCodeAt(t+5)===Gx?t+6:t+5,i=e.slice(n,r);d=f===0?i:`${d}\n${i}`,f++;return}if(Yx(e,t,i)){p=e.slice(e.charCodeAt(t+6)===Gx?t+7:t+6,r)||void 0;return}if(i===105&&e.charCodeAt(t+1)===100&&e.charCodeAt(t+2)===58){let n=e.slice(e.charCodeAt(t+3)===Gx?t+4:t+3,r);n.includes(`\0`)||(u=n);return}if(i===58){if(n){let i=e.slice(t,r);n(i.slice(e.charCodeAt(t+1)===Gx?2:1))}return}let a=e.slice(t,r),o=a.indexOf(`:`);if(o===-1){w(a,``,a);return}let s=a.slice(0,o),c=a.charCodeAt(o+1)===Gx?2:1;w(s,a.slice(o+c),a)}function w(e,t,n){switch(e){case`event`:p=t||void 0;break;case`data`:d=f===0?t:`${d}\n${t}`,f++;break;case`id`:t.includes(`\0`)||(u=t);break;case`retry`:/^\d+$/.test(t)?o?.(parseInt(t,10)):r?.(new Hx(`Invalid \`retry\` value: "${t}"`,{type:`invalid-retry`,value:t,line:n}));break;default:r?.(new Hx(`Unknown field "${e.length>20?`${e.slice(0,20)}…`:e}"`,{type:`unknown-field`,field:e,value:t,line:n}))}}function T(){u!==void 0&&a?.(u),f>0&&i?.({id:u,event:p,data:d}),u=void 0,d=``,f=0,p=void 0}function E(e={}){if(e.consume&&s.length>0){let e=s.join(``);C(e,0,e.length)}l=!0,u=void 0,d=``,f=0,p=void 0,s.length=0,c=0,m=!1,h=!1,g=!1}return{feed:_,reset:E}}function Jx(e,t,n){return n===100&&e.charCodeAt(t+1)===97&&e.charCodeAt(t+2)===116&&e.charCodeAt(t+3)===97&&e.charCodeAt(t+4)===58}function Yx(e,t,n){return n===101&&e.charCodeAt(t+1)===118&&e.charCodeAt(t+2)===101&&e.charCodeAt(t+3)===110&&e.charCodeAt(t+4)===116&&e.charCodeAt(t+5)===58}function Xx(e,t){let n=1;for(;n<e.length&&n<t.length;){if(e.charCodeAt(n)!==t.charCodeAt(n))return!1;n++}return e.length<=t.length||e.charCodeAt(t.length)===58}var Zx=class extends Error{};async function Qx(e){let t=new 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r=e.type!==`prompt_failed`;t({promptAdmissionRecovery:null,promptAdmissionResolution:r&&u?{commandId:u.commandId,content:u.content}:n.promptAdmissionResolution,liveMessages:r&&u&&!n.liveMessages.some(e=>e.key===u.optimisticKey)?[...n.liveMessages,{key:u.optimisticKey,message:{role:`user`,content:u.content}}].slice(-8):n.liveMessages})}if(e.type===`runtime_changed`&&t(k()),e.type===`runtime_changed`&&P(),n.sessionSwitching&&!l){F();return}if(typeof a==`string`&&a!==n.snapshot?.currentSessionId&&!l){F();return}if(n.snapshot){let r=$x(n.snapshot.runtime.liveTools??[],e.type,i);t({snapshot:{...n.snapshot,runtime:{...n.snapshot.runtime,liveTools:r}}})}if(l){let a=i.commandId;if(typeof a==`string`&&E.has(a)){F();return}let l=i.sessionPath,d=n.snapshot?.sessions.some(e=>e.path===l),f=!1;if(c?.kind===`select`?f=c.expectedPath===l:c?.kind===`create`&&c.commandId===a&&e.type===`session_switched`&&typeof 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if(e.type===`turn_started`)t({activeTurn:{sessionId:String(i.sessionId),commandId:String(i.commandId),epoch:Number(i.epoch)},liveRunning:!0,livePhase:`running`,liveRetry:null,turnTerminalStatus:null});else if(e.type===`agent_start`)t({...i.activeTurn?{activeTurn:i.activeTurn}:{},liveRunning:!0,livePhase:`running`,liveRetry:null});else if(e.type===`turn_settled`){D(T,i.commandId);let e=n.activeTurn;e?.sessionId===i.sessionId&&e?.commandId===i.commandId&&e?.epoch===i.epoch&&t({activeTurn:null,liveRunning:!1,livePhase:`idle`,liveRetry:null,turnTerminalStatus:typeof i.outcome==`string`?i.outcome:null})}else if(e.type===`agent_settled`)t({pendingFollowUpsReceipt:null,...n.activeTurn?{}:{liveRunning:!1,livePhase:`idle`,liveRetry:null}});else if(e.type===`prompt_settled`)D(T,i.commandId),n.livePhase!==`running`&&t({liveRunning:!1,livePhase:`idle`,liveRetry:null});else if(i.message&&typeof i.message==`object`){let r=i.message,a=n.liveMessages;r.role===`user`&&(a=a.filter(e=>!e.key.startsWith(`optimistic-`)||e.message.content!==r.content));let o=typeof i.messageKey==`string`?i.messageKey:`${r.role||`message`}-${e.sequence}`,s={key:o,message:r},c=a.findIndex(e=>e.key===o);a=c>=0?a.map((e,t)=>t===c?s:e):[...a,s].slice(-8);let l={...n.thinkingStarts},u={...n.thinkingDurations};r.parts?.some(e=>e.type===`thinking`)&&(l[o]??=Date.now(),e.type===`message_end`&&(u[o]=Date.now()-l[o])),t({liveMessages:a,thinkingDurations:u,thinkingStarts:l})}if(e.type===`prompt_failed`&&(D(T,i.commandId),t({liveMessages:M().liveMessages.filter(e=>!e.key.startsWith(`optimistic-`)),liveRunning:!1,livePhase:`idle`,liveRetry:null,notice:typeof i.error==`string`?i.error:`Prompt failed`})),e.type===`auto_retry_start`&&t({liveRunning:!0,livePhase:`running`,liveRetry:{attempt:Number(i.attempt)||0,maxAttempts:Number(i.maxAttempts)||0}}),e.type===`thinking_level_changed`){let t=M().snapshot?.thinking;t&&typeof i.level==`string`&&te({...t,level:i.level,revision:e.sequence})}nS.has(e.type)&&F()},ie=async r=>{let i=500;for(;!r.aborted;){let a=!1;try{if(M().cursor===null){if(a=!0,!await M().actions.refreshSnapshot({resetCursor:!0}))throw Error(`snapshot unavailable`);a=!1}if(r.aborted)return;await n({client:e,cursor:M().cursor??0,onConnected:()=>{i=500,t({connection:`connected`,notice:null})},onEvent:z,onHeartbeat:()=>F(0),signal:r})}catch(e){if(r.aborted)return;t({connection:`reconnecting`}),!a&&await M().actions.refreshSnapshot({resetCursor:!0})||t(O()),await oS(i,r),i=Math.min(i*2,5e3),e instanceof SyntaxError&&t({notice:`Invalid event data`})}}},ae={start(){p||(p=new AbortController,ie(p.signal))},stop(){p?.abort(),p=null,u!==null&&window.clearTimeout(u),u=null,ne(),P()},async refreshSnapshot(n={}){let a=n.epoch??r,o=++i,c=M().selectedPath;try{let l=await e.snapshot(c);if(a!==r||o!==i)return!1;let u=typeof l.currentSessionId==`string`,d=u?l.sessions.find(e=>e.id===l.currentSessionId):void 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n=M();e===n.selectedWorkspace&&!n.sessionSwitching||(++r,ne(),P(),o=null,s=null,t({...O(),...k(),selectedWorkspace:e,workspaceDraft:!0,sessionSwitching:!1,modelSelectionPending:!1,promptAdmissionPending:!1,promptAdmissionRecovery:null,promptAdmissionResolution:n.promptAdmissionRecovery?{commandId:n.promptAdmissionRecovery.commandId,content:n.promptAdmissionRecovery.content}:n.promptAdmissionResolution,notice:null}))},async renameWorkspace(t,n){try{await e.renameWorkspace(t,n),await ae.refreshSnapshot()}catch(e){throw N(e),e}},async removeWorkspace(n){try{await e.removeWorkspace(n),M().selectedWorkspace===n&&P(),t({selectedPath:null,selectedWorkspace:M().selectedWorkspace===n?null:M().selectedWorkspace}),await ae.refreshSnapshot()}catch(e){N(e)}},async createSession(n){if(!n||M().modelSelectionPending)return!1;let i=M(),a=++r;ne(),P();let u=globalThis.crypto?.randomUUID?.()??`web-create-${Date.now()}-${a}`;o=null,s=null,t({...O(),...k(),mobileSidebarOpen:!1,promptAdmissionPending:!1,promptAdmissionRecovery:null,promptAdmissionResolution:i.promptAdmissionRecovery?{commandId:i.promptAdmissionRecovery.commandId,content:i.promptAdmissionRecovery.content}:i.promptAdmissionResolution,selectedPath:null,selectedWorkspace:n,workspaceDraft:!0,sessionSwitching:!0});let d=!1,f=l.then(async()=>{if(a===r){c={commandId:u,epoch:a,expectedPath:null,kind:`create`,observedPath:null};try{let i=await e.createSession(n,u);if(a!==r)return;if(i.cancelled||!i.sessionPath)throw Error(`Session creation was not confirmed. 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ae.refreshSnapshot({epoch:a})}finally{c?.epoch===a&&(c=null),a===r&&t({sessionSwitching:!1})}}});l=u.catch(()=>void 0),await u},async renameSession(t,n){try{await e.renameSession(t,n),await ae.refreshSnapshot()}catch(e){throw N(e),e}},async archiveSession(t){try{await e.archiveSession(t),await ae.refreshSnapshot()}catch(e){N(e)}},async unarchiveSession(t){let n=r;try{return await e.unarchiveSession(t),n!==r||await ae.refreshSnapshot({epoch:n})}catch(e){return n===r&&N(e),!1}},async selectModel(e){let[n,...i]=e.split(`/`),a=i.join(`/`),o=M();if(!n||!a||o.sessionSwitching||o.modelSelectionPending||o.promptAdmissionPending||!o.workspaceDraft&&(o.liveRunning||o.snapshot?.runtime.status===`running`))return;let s=o.snapshot?.selectedSession?.id;if(o.workspaceDraft||!s&&!o.snapshot?.currentSessionId){let e=[...o.snapshot?.models??[],...o.modelSearch.models].find(e=>e.provider===n&&e.id===a);e&&t({draftModel:e,notice:null});return}!s||s!==o.snapshot?.currentSessionId||(ne(),await ee({provider:n,id:a},r,s))},async searchModels(n){let a=n.trim();if(!a){t(k());return}m?.abort();let o=new AbortController;m=o;let s=++h,c=r,l=i,u=M().snapshot?.currentSessionId;t({modelSearch:{query:a,status:`loading`,models:[],totalMatches:0,matchesOmitted:0,error:null}});try{let n=await e.searchModels(a,u,o.signal);if(o.signal.aborted||c!==r||l!==i||s!==h)return;t({modelSearch:{query:a,status:`ready`,models:n.models,totalMatches:n.totalMatches,matchesOmitted:n.truncation.matchesOmitted,error:null}})}catch(e){if(o.signal.aborted||c!==r||l!==i||s!==h)return;t({modelSearch:{query:a,status:`error`,models:[],totalMatches:0,matchesOmitted:0,error:e instanceof Error?e.message:String(e)}})}finally{m===o&&(m=null)}},clearModelSearch(){t(k())},selectThinking(e){let n=M(),r=n.snapshot?.thinking,i=n.snapshot?.selectedSession?.id;!e||!r?.supported||n.sessionSwitching||n.modelSelectionPending||n.workspaceDraft||!i||i!==n.snapshot?.currentSessionId||n.liveRunning||n.snapshot?.runtime.status===`running`||e!==(n.thinkingPendingLevel??r.level)&&(g=e,_++,t({thinkingPendingLevel:e}),R())},async cancelActiveTurn(){let n=M().activeTurn??M().snapshot?.runtime.activeTurn;if(!n||M().turnCancellationPending||M().sessionSwitching)return;let i=r;t({turnCancellationPending:!0});try{await e.cancelActiveTurn(n)}catch(e){if(i!==r)return;await ae.refreshSnapshot({epoch:i}),i===r&&N(e)}finally{i===r&&t({turnCancellationPending:!1})}},async sendPrompt(n){let i=n.trim(),c=M(),l=c.promptAdmissionRecovery,u=l?.phase===`submitting`?l:null,d=c.selectedWorkspace;if(!d||!i||c.sessionSwitching||c.promptAdmissionPending||l&&!u||c.promptAdmissionResolution||c.modelSelectionPending||c.thinkingPendingLevel!==null)return!1;let f=M().workspaceDraft||!M().snapshot?.selectedSession?.id;if(f&&!await ae.createSession(d)||f&&M().draftModel)return!1;let p=M().snapshot?.selectedSession?.id;if(!p||M().workspaceDraft||M().selectedWorkspace!==d||M().snapshot?.selectedSession?.cwd!==d||p!==M().snapshot?.currentSessionId||M().sessionSwitching||M().promptAdmissionPending||u&&(M().promptAdmissionRecovery?.commandId!==u.commandId||M().promptAdmissionRecovery?.phase!==`submitting`))return!1;let m=r,h=M().draftModel;if(h&&!await ee(h,m,p)||m!==r||p!==M().snapshot?.selectedSession?.id||p!==M().snapshot?.currentSessionId||M().workspaceDraft||M().selectedWorkspace!==d||M().snapshot?.selectedSession?.cwd!==d||u&&(M().promptAdmissionRecovery?.commandId!==u.commandId||M().promptAdmissionRecovery?.phase!==`submitting`))return!1;let g=++a,_=s?.sessionId===p&&s.content===i,v=_?s.commandId:globalThis.crypto?.randomUUID?.()??`web-prompt-${Date.now()}-${g}`,y=_?s.optimisticKey:`optimistic-${v}`;s={sessionId:p,content:i,commandId:v,optimisticKey:y},o=g,t({liveMessages:_?M().liveMessages:[...M().liveMessages,{key:y,message:{role:`user`,content:i}}].slice(-8),notice:null,pendingFollowUpsReceipt:null,turnTerminalStatus:null,promptAdmissionPending:!0,scrollToBottom:M().scrollToBottom+1});try{let n=await e.prompt(p,i,v,_);if(m!==r||o!==g)return!1;let a=T.has(n.id);return s?.commandId===v&&(s=null),t({...j(a,M().livePhase),pendingFollowUpsReceipt:n.pendingFollowUps??null,...u&&M().promptAdmissionRecovery?.commandId===u.commandId?{promptAdmissionRecovery:null}:{}}),F(120),!0}catch(e){if(m!==r||o!==g)return!1;if(e instanceof Qu&&e.code===`COMMAND_ADMISSION_UNKNOWN`&&s?.commandId===v){let e=s;s=null,t({liveRunning:!1,livePhase:`idle`,liveRetry:null,notice:null,promptAdmissionPending:!1,promptAdmissionRecovery:{...e,phase:`checking`}});let n=await ae.refreshSnapshot({resetCursor:!0,epoch:m}),r=M().promptAdmissionRecovery;return r?.commandId===v&&t({promptAdmissionRecovery:{...r,phase:n?`ready`:`verification-failed`}}),!1}return e instanceof Qu&&[`WORKSPACE_REQUIRED`,`SESSION_CONFLICT`,`PROMPT_REJECTED`,`COMMAND_CONFLICT`,`PROMPT_ADMISSION_CAPACITY`].includes(e.code??``)?(s?.commandId===v&&(s=null),t({liveMessages:M().liveMessages.filter(e=>e.key!==y),livePhase:`idle`,liveRetry:null,liveRunning:!1}),N(e),!1):(t({liveRunning:!0,livePhase:M().livePhase===`running`?`running`:`preparing`,liveRetry:null}),N(e),!1)}finally{m===r&&o===g&&(o=null,t({promptAdmissionPending:!1}))}},async checkPromptAdmissionRecovery(){let e=M().promptAdmissionRecovery;if(!e||e.phase!==`verification-failed`)return;let n=r;t({notice:null,promptAdmissionRecovery:{...e,phase:`checking`}});let i=await ae.refreshSnapshot({resetCursor:!0,epoch:n}),a=M().promptAdmissionRecovery;a?.commandId===e.commandId&&a.phase===`checking`&&t({promptAdmissionRecovery:{...a,phase:i?`ready`:`verification-failed`}})},async sendPromptAsNew(e){let n=M().promptAdmissionRecovery;if(!n||n.phase!==`ready`||n.sessionId!==M().snapshot?.selectedSession?.id)return!1;let r=e.trim();if(!r)return!1;t({promptAdmissionRecovery:{...n,phase:`submitting`},notice:null});let i=!1;try{return i=await ae.sendPrompt(r),i}finally{let e=M().promptAdmissionRecovery;e?.commandId===n.commandId&&e.phase===`submitting`&&t({promptAdmissionRecovery:i?null:{...e,phase:`ready`}})}},abandonPromptAdmission(){let e=M().promptAdmissionRecovery;!e||e.phase===`submitting`||t({liveMessages:M().liveMessages.filter(t=>t.key!==e.optimisticKey),notice:null,promptAdmissionRecovery:null})},acknowledgePromptAdmissionResolution(e){M().promptAdmissionResolution?.commandId===e&&t({promptAdmissionResolution:null})},async discoverCommands(){let n=M(),i=n.snapshot?.selectedSession?.id;if(n.workspaceDraft||!i||i!==n.snapshot?.currentSessionId||n.sessionSwitching){P();return}if(n.commandDiscovery.sessionId===i&&(n.commandDiscovery.status===`loading`||n.commandDiscovery.status===`ready`))return;let a=r,o=++w;C?.abort();let s=new AbortController;C=s,t({commandDiscovery:{sessionId:i,status:`loading`,commands:[],totalAvailable:0,commandsOmitted:0,error:null}});try{let n=await e.commands(i,s.signal);if(s.signal.aborted||a!==r||o!==w||i!==M().snapshot?.currentSessionId)return;t({commandDiscovery:{sessionId:i,status:`ready`,commands:n.commands,totalAvailable:n.totalAvailable,commandsOmitted:n.truncation.commandsOmitted,error:null}})}catch(e){if(s.signal.aborted||a!==r||o!==w)return;t({commandDiscovery:{sessionId:i,status:`error`,commands:[],totalAvailable:0,commandsOmitted:0,error:e instanceof Error?e.message:String(e)}})}finally{C===s&&(C=null)}},clearCommandDiscovery:P,setQuery(e){t({query:e})},setSearchOpen(e){t({searchOpen:e,...e?{}:{query:``}})},toggleWorkspace(e){let n=new Set(M().collapsed);n.has(e)?n.delete(e):n.add(e),aS(eS,[...n]),t({collapsed:n})},toggleSidebar(e){if(e){t({mobileSidebarOpen:!M().mobileSidebarOpen});return}let 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i.level==`string`&&re({...t,level:i.level,revision:e.sequence})}nS.has(e.type)&&L()},oe=async r=>{let i=500;for(;!r.aborted;){let a=!1;try{if(N().cursor===null){if(a=!0,!await N().actions.refreshSnapshot({resetCursor:!0}))throw Error(`snapshot unavailable`);a=!1}if(r.aborted)return;await n({client:e,cursor:N().cursor??0,onConnected:()=>{i=500,t({connection:`connected`})},onEvent:ae,onHeartbeat:()=>L(0),signal:r})}catch(e){if(r.aborted)return;t({connection:`reconnecting`}),!a&&await N().actions.refreshSnapshot({resetCursor:!0})||t(k()),await oS(i,r),i=Math.min(i*2,5e3),e instanceof SyntaxError&&t({notice:`Invalid event data`})}}},se={start(){m||(m=new AbortController,oe(m.signal))},stop(){m?.abort(),m=null,d!==null&&window.clearTimeout(d),d=null,R(),F()},async refreshSnapshot(n={}){let a=n.epoch??r,o=++i,c=N().selectedPath;try{let l=await e.snapshot(c);if(a!==r||o!==i)return!1;let u=typeof l.currentSessionId==`string`,d=u?l.sessions.find(e=>e.id===l.currentSessionId):void 0,f=u?l.selectedSession?.id===l.currentSessionId:l.selectedSession===void 0,p=!c||l.sessions.some(e=>e.path===c),m=!c||l.selectedSession?.path===c;if(!p||!m||!f)return t({selectedPath:null}),!n.canonicalRetry&&se.refreshSnapshot({...n,canonicalRetry:!0,epoch:a});let h=l.selectedSession?.cwd,g=l.workspaces.find(e=>e.current)?.path,_=l.workspaces.some(e=>e.path===N().selectedWorkspace)?N().selectedWorkspace:void 0,v=N().workspaceDraft?N().selectedWorkspace:l.workspaces.some(e=>e.path===h)?h:g??_??null,y=n.resetCursor;return y&&te(),N().snapshot?.currentSessionId!==l.currentSessionId&&F(),t({...y?k():{},connection:N().connection===`connecting`?`connecting`:N().connection,cursor:y||N().cursor===null?l.cursor:Math.max(N().cursor??0,l.cursor),activeTurn:l.runtime.activeTurn??null,livePhase:l.runtime.status===`running`?`running`:!N().promptAdmissionPending&&!s?`idle`:N().livePhase,liveRetry:l.runtime.status!==`running`&&!N().promptAdmissionPending&&!s?null:N().liveRetry,liveRunning:l.runtime.status===`running`?!0:!N().promptAdmissionPending&&!s?!1:N().liveRunning,selectedPath:d?.path??l.selectedSession?.path??null,selectedWorkspace:v,snapshot:l,...A()}),re(),!0}catch(e){return a!==r||o!==i?!1:(t({connection:`unavailable`}),P(e),!1)}},async chooseWorkspace(){let t=r;try{let n=await e.chooseWorkspace();if(t!==r||n.cancelled||!n.path)return;se.setWorkspace(n.path),await se.refreshSnapshot()}catch(e){t===r&&P(e)}},setWorkspace(e){let n=N();e===n.selectedWorkspace&&!n.sessionSwitching||(++r,l=null,R(),F(),o=null,s=null,t({...k(),...A(),selectedWorkspace:e,workspaceDraft:!0,sessionSwitching:!1,modelSelectionPending:!1,promptAdmissionPending:!1,promptAdmissionRecovery:null,promptAdmissionResolution:n.promptAdmissionRecovery?{commandId:n.promptAdmissionRecovery.commandId,content:n.promptAdmissionRecovery.content}:n.promptAdmissionResolution,notice:null}))},async renameWorkspace(t,n){try{await e.renameWorkspace(t,n),await se.refreshSnapshot()}catch(e){throw P(e),e}},async removeWorkspace(n){try{await e.removeWorkspace(n),N().selectedWorkspace===n&&F(),t({selectedPath:null,selectedWorkspace:N().selectedWorkspace===n?null:N().selectedWorkspace}),await se.refreshSnapshot()}catch(e){P(e)}},async createSession(n){if(!n||N().modelSelectionPending)return null;let i=N(),a=++r;R(),F();let d=(l?.workspacePath===n?l.commandId:void 0)??globalThis.crypto?.randomUUID?.()??`web-create-${Date.now()}-${a}`;l={workspacePath:n,commandId:d},o=null,s=null,t({...k(),...A(),mobileSidebarOpen:!1,promptAdmissionPending:!1,promptAdmissionRecovery:null,promptAdmissionResolution:i.promptAdmissionRecovery?{commandId:i.promptAdmissionRecovery.commandId,content:i.promptAdmissionRecovery.content}:i.promptAdmissionResolution,selectedPath:null,selectedWorkspace:n,workspaceDraft:!0,sessionSwitching:!0});let f=null,p=u.then(async()=>{if(a===r){c={commandId:d,epoch:a,expectedPath:null,kind:`create`};try{let i=await e.createSession(n,d);if(a!==r)return;if(i.cancelled||i.commandId!==d||typeof i.sessionId!=`string`||!i.sessionId||i.sessionId.length>128||i.sessionPath!==void 0&&!i.sessionPath)throw Error(`Session creation did not return a valid target identity.`);let o={epoch:a,sessionId:i.sessionId,sessionPath:i.sessionPath??null,workspacePath:n};c?.epoch===a&&(c.expectedSessionId=o.sessionId,c.expectedPath=o.sessionPath),t({selectedPath:o.sessionPath});let s=await se.refreshSnapshot({epoch:a});if(!s&&a===r&&(s=await se.refreshSnapshot({epoch:a})),a!==r)return;if(!s)throw Error(`The created Session could not be confirmed. 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y=++a,b=s?.sessionId===_&&s.content===i,x=b?s.commandId:globalThis.crypto?.randomUUID?.()??`web-prompt-${Date.now()}-${y}`,S=b?s.optimisticKey:`optimistic-${x}`;s={sessionId:_,content:i,commandId:x,optimisticKey:S},o=y,t({liveMessages:b?N().liveMessages:[...N().liveMessages,{key:S,message:{role:`user`,content:i}}].slice(-8),notice:null,pendingFollowUpsReceipt:null,turnTerminalStatus:null,promptAdmissionPending:!0,scrollToBottom:N().scrollToBottom+1});try{let n=await e.prompt(_,i,x,b);if(g!==r||o!==y)return!1;let a=E.has(n.id);return s?.commandId===x&&(s=null),t({...M(a,N().livePhase),pendingFollowUpsReceipt:n.pendingFollowUps??null,...u&&N().promptAdmissionRecovery?.commandId===u.commandId?{promptAdmissionRecovery:null}:{}}),L(120),!0}catch(e){if(g!==r||o!==y)return!1;if(e instanceof Qu&&e.code===`COMMAND_ADMISSION_UNKNOWN`&&s?.commandId===x){let e=s;s=null,t({liveRunning:!1,livePhase:`idle`,liveRetry:null,notice:null,promptAdmissionPending:!1,promptAdmissionRecovery:{...e,phase:`checking`}});let n=await se.refreshSnapshot({resetCursor:!0,epoch:g}),r=N().promptAdmissionRecovery;return r?.commandId===x&&t({promptAdmissionRecovery:{...r,phase:n?`ready`:`verification-failed`}}),!1}return e instanceof Qu&&[`WORKSPACE_REQUIRED`,`SESSION_CONFLICT`,`PROMPT_REJECTED`,`COMMAND_CONFLICT`,`PROMPT_ADMISSION_CAPACITY`].includes(e.code??``)?(s?.commandId===x&&(s=null),t({liveMessages:N().liveMessages.filter(e=>e.key!==S),livePhase:`idle`,liveRetry:null,liveRunning:!1}),P(e),!1):(t({liveRunning:!0,livePhase:N().livePhase===`running`?`running`:`preparing`,liveRetry:null}),P(e),!1)}finally{g===r&&o===y&&(o=null,t({promptAdmissionPending:!1}))}},async checkPromptAdmissionRecovery(){let e=N().promptAdmissionRecovery;if(!e||e.phase!==`verification-failed`)return;let n=r;t({notice:null,promptAdmissionRecovery:{...e,phase:`checking`}});let i=await se.refreshSnapshot({resetCursor:!0,epoch:n}),a=N().promptAdmissionRecovery;a?.commandId===e.commandId&&a.phase===`checking`&&t({promptAdmissionRecovery:{...a,phase:i?`ready`:`verification-failed`}})},async sendPromptAsNew(e){let n=N().promptAdmissionRecovery;if(!n||n.phase!==`ready`||n.sessionId!==N().snapshot?.selectedSession?.id)return!1;let r=e.trim();if(!r)return!1;t({promptAdmissionRecovery:{...n,phase:`submitting`},notice:null});let i=!1;try{return i=await se.sendPrompt(r),i}finally{let e=N().promptAdmissionRecovery;e?.commandId===n.commandId&&e.phase===`submitting`&&t({promptAdmissionRecovery:i?null:{...e,phase:`ready`}})}},abandonPromptAdmission(){let e=N().promptAdmissionRecovery;!e||e.phase===`submitting`||t({liveMessages:N().liveMessages.filter(t=>t.key!==e.optimisticKey),notice:null,promptAdmissionRecovery:null})},acknowledgePromptAdmissionResolution(e){N().promptAdmissionResolution?.commandId===e&&t({promptAdmissionResolution:null})},async discoverCommands(){let n=N(),i=n.snapshot?.selectedSession?.id;if(n.workspaceDraft||!i||i!==n.snapshot?.currentSessionId||n.sessionSwitching){F();return}if(n.commandDiscovery.sessionId===i&&(n.commandDiscovery.status===`loading`||n.commandDiscovery.status===`ready`))return;let a=r,o=++T;w?.abort();let s=new AbortController;w=s,t({commandDiscovery:{sessionId:i,status:`loading`,commands:[],totalAvailable:0,commandsOmitted:0,error:null}});try{let n=await e.commands(i,s.signal);if(s.signal.aborted||a!==r||o!==T||i!==N().snapshot?.currentSessionId)return;t({commandDiscovery:{sessionId:i,status:`ready`,commands:n.commands,totalAvailable:n.totalAvailable,commandsOmitted:n.truncation.commandsOmitted,error:null}})}catch(e){if(s.signal.aborted||a!==r||o!==T)return;t({commandDiscovery:{sessionId:i,status:`error`,commands:[],totalAvailable:0,commandsOmitted:0,error:e instanceof Error?e.message:String(e)}})}finally{w===s&&(w=null)}},clearCommandDiscovery:F,setQuery(e){t({query:e})},setSearchOpen(e){t({searchOpen:e,...e?{}:{query:``}})},toggleWorkspace(e){let n=new Set(N().collapsed);n.has(e)?n.delete(e):n.add(e),aS(eS,[...n]),t({collapsed:n})},toggleSidebar(e){if(e){t({mobileSidebarOpen:!N().mobileSidebarOpen});return}let n=!N().sidebarCollapsed;try{window.sessionStorage.setItem(tS,String(n))}catch{}t({sidebarCollapsed:n})},closeMobileSidebar(){t({mobileSidebarOpen:!1})},clearNotice(){t({notice:null})}};return{activeTurn:null,turnCancellationPending:!1,turnTerminalStatus:null,pendingFollowUpsReceipt:null,snapshot:null,cursor:null,selectedPath:null,selectedWorkspace:null,workspaceDraft:!1,draftModel:null,modelSelectionPending:!1,modelSearch:{query:``,status:`idle`,models:[],totalMatches:0,matchesOmitted:0,error:null},collapsed:rS(eS),sidebarCollapsed:iS(tS),mobileSidebarOpen:!1,query:``,searchOpen:!1,connection:`connecting`,notice:null,liveMessages:[],liveRunning:!1,livePhase:`idle`,liveRetry:null,thinkingStarts:{},thinkingDurations:{},promptAdmissionPending:!1,promptAdmissionRecovery:null,promptAdmissionResolution:null,sessionSwitching:!1,scrollToBottom:0,thinkingPendingLevel:null,commandDiscovery:j(),actions:se}})}var cS=sS();function lS(){let e=fn(cS),{t}=sn(),{actions:n}=e,r=(0,w.useRef)(null),[i,a]=(0,w.useState)(()=>window.matchMedia?.(`(max-width: 760px)`).matches??!1),o=i&&e.mobileSidebarOpen;(0,w.useEffect)(()=>{let e=window.matchMedia?.(`(max-width: 760px)`);if(!e)return;let t=()=>{a(e.matches),e.matches||n.closeMobileSidebar()};return t(),e.addEventListener(`change`,t),()=>e.removeEventListener(`change`,t)},[n]);let[s,c]=(0,w.useState)(`chat`),[l,u]=(0,w.useState)(null),d=e.snapshot?.models.find(e=>e.current),f=JSON.stringify([d?.provider,d?.id]),p=t=>{let n=e.snapshot,r=n?.selectedSession;e.workspaceDraft||!n||!r||e.sessionSwitching||r.id!==n.currentSessionId||u({sessionId:r.id,sessionPath:r.path,cwd:r.cwd,model:d?.label??``,modelKey:f,terminalId:t})},m=l&&!e.workspaceDraft&&!e.sessionSwitching&&l.sessionId===e.snapshot?.currentSessionId&&l.sessionPath===e.snapshot?.selectedSession?.path&&l.modelKey===f;(0,w.useEffect)(()=>{l&&!m&&u(null)},[l,m]),(0,w.useEffect)(()=>(n.start(),n.stop),[n]);let h=e.workspaceDraft?void 0:e.snapshot?.selectedSession,g=h?.entries.some(e=>e.type===`message`&&e.message)||e.liveMessages.length>0,_=!h||!g,v=(0,w.useCallback)(e=>n.sendPrompt(e),[n]);return(0,V.jsxs)(`div`,{className:`app-shell ${e.sidebarCollapsed?`sidebar-collapsed`:``} ${e.mobileSidebarOpen?`sidebar-open`:``}`,children:[(0,V.jsx)(rd,{snapshot:e.snapshot,selectedPath:e.workspaceDraft?null:e.selectedPath,selectedWorkspace:e.selectedWorkspace,collapsed:e.collapsed,query:e.query,searchOpen:e.searchOpen,mobileOpen:o,returnFocusRef:r,actions:n}),e.sidebarCollapsed&&(0,V.jsx)(`button`,{className:`sidebar-expand`,type:`button`,"aria-label":t(`expandSidebar`),title:t(`expandSidebar`),onClick:()=>n.toggleSidebar(!1),children:(0,V.jsx)(Se,{})}),(0,V.jsxs)(`main`,{inert:o,className:`conversation-shell ${h?`has-view`:``} ${_&&(e.workspaceDraft||s===`chat`)?`landing`:``}`,children:[(0,V.jsx)(`h1`,{className:`sr-only`,children:`OpenPI`}),(0,V.jsxs)(`header`,{className:`mobile-header`,children:[(0,V.jsx)(`button`,{ref:r,type:`button`,"aria-label":t(`openSidebar`),"aria-controls":`session-sidebar`,"aria-expanded":o,onClick:()=>n.toggleSidebar(!0),children:(0,V.jsx)(be,{})}),(0,V.jsx)(`span`,{className:`connection-state ${e.connection}`,children:t(e.connection)})]}),h&&(0,V.jsxs)(`fieldset`,{className:`conversation-view-switch`,"aria-label":t(`conversationView`),children:[(0,V.jsx)(`button`,{type:`button`,"aria-pressed":s===`chat`,onClick:()=>c(`chat`),children:t(`chatView`)}),(0,V.jsx)(`button`,{type:`button`,"aria-pressed":s===`trajectory`,onClick:()=>c(`trajectory`),children:t(`trajectory`)})]}),e.sessionSwitching?(0,V.jsx)(`div`,{className:`conversation 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yS({children:e}){let t=fn(cS,e=>e.snapshot?.preferences?.theme)??`system`,[n,r]=(0,w.useState)(()=>window.matchMedia?.(`(prefers-color-scheme: dark)`).matches??!1);(0,w.useEffect)(()=>{let e=window.matchMedia?.(`(prefers-color-scheme: dark)`);if(!e)return;let t=()=>r(e.matches);return t(),e.addEventListener(`change`,t),()=>e.removeEventListener(`change`,t)},[]);let i=t===`dark`||t===`system`&&n?`dark`:`light`;return(0,w.useEffect)(()=>{document.documentElement.dataset.theme=i},[i]),(0,V.jsx)(cn,{i18n:Pt,children:(0,V.jsx)(gS,{theme:vS,mode:i,children:e})})}var bS=document.getElementById(`root`);if(!bS)throw Error(`OpenPI Web root is missing`);(0,ze.createRoot)(bS).render((0,V.jsx)(w.StrictMode,{children:(0,V.jsx)(yS,{children:(0,V.jsx)(lS,{})})}));
\ No newline at end of file
diff --git a/web/host/web-host.ts b/web/host/web-host.ts
index 63a3f317..852119b2 100644
--- a/web/host/web-host.ts
+++ b/web/host/web-host.ts
@@ -547,8 +547,9 @@ export class WebHost {
       const result = await this.runtime.newSession(workspacePath, {
         commandId: body.commandId,
       });
-      this.publish("session_created", {
+      if (!result.replayed) this.publish("session_created", {
         workspacePath,
+        sessionId: result.sessionId,
         commandId: body.commandId,
         ...(result.sessionPath ? { sessionPath: result.sessionPath } : {}),
       });
diff --git a/web/runtime/pi-runtime.ts b/web/runtime/pi-runtime.ts
index b389a822..2bce0cc3 100644
--- a/web/runtime/pi-runtime.ts
+++ b/web/runtime/pi-runtime.ts
@@ -25,6 +25,7 @@ import {
   type WebRuntimeController,
   type WebRuntimeEvent,
   type WebSessionCreationOptions,
+  type WebSessionCreationResult,
   type WebThinkingProjection,
   type WebThinkingSelectionOptions,
   type WebTurnCancellationOptions,
@@ -836,10 +837,24 @@ export class PiWebRuntime implements WebRuntimeController {
     return await requestAdmission;
   }
 
+  private sessionCreationReceipts?: Map<string, { workspacePath: string; result: WebSessionCreationResult }>;
+
   newSession(workspacePath: string, options?: WebSessionCreationOptions) {
-    return this.serializeControllerMutation(() =>
-      this.createNewSession(workspacePath, options),
-    );
+    return this.serializeControllerMutation(async () => {
+      this.assertActive();
+      const commandId = options?.commandId;
+      const receipts = this.sessionCreationReceipts ??= new Map();
+      const previous = commandId ? receipts.get(commandId) : undefined;
+      if (previous) {
+        if (previous.workspacePath !== workspacePath) throw new Error("Session creation command belongs to another workspace");
+        return { ...previous.result, replayed: true };
+      }
+      // Do not evict receipts: forgetting a command would permit duplicate creation.
+      if (commandId && receipts.size >= 1024) throw new Error("Session creation receipt limit reached; select an existing Session or restart the Web host");
+      const result = await this.createNewSession(workspacePath, options);
+      if (commandId) receipts.set(commandId, { workspacePath, result: { ...result } });
+      return result;
+    });
   }
 
   private async createNewSession(
@@ -855,13 +870,16 @@ export class PiWebRuntime implements WebRuntimeController {
     );
     await this.activateCandidate(replacement.runtime);
     this.hasSelectedWorkspace = true;
+    const sessionId = this.runtime.session.sessionManager.getSessionId();
     const sessionPath = this.runtime.session.sessionManager.getSessionFile();
     this.emit("session_switched", {
+      sessionId,
       ...(options?.commandId ? { commandId: options.commandId } : {}),
       ...(sessionPath ? { sessionPath } : {}),
     });
     return {
       cancelled: false,
+      sessionId,
       ...(options?.commandId ? { commandId: options.commandId } : {}),
       ...(sessionPath ? { sessionPath } : {}),
     };
diff --git a/web/runtime/types.ts b/web/runtime/types.ts
index 9c63a392..56d28973 100644
--- a/web/runtime/types.ts
+++ b/web/runtime/types.ts
@@ -111,7 +111,9 @@ export interface WebSessionCreationOptions {
 
 export interface WebSessionCreationResult {
   cancelled: boolean;
+  replayed?: boolean;
   commandId?: string;
+  sessionId: string;
   sessionPath?: string;
 }
 
diff --git a/web/ui/src/protocol/client.ts b/web/ui/src/protocol/client.ts
index aeb1c648..bbb77332 100644
--- a/web/ui/src/protocol/client.ts
+++ b/web/ui/src/protocol/client.ts
@@ -64,6 +64,13 @@ export interface SessionMutationResult {
   sessionPath?: string;
 }
 
+export interface SessionCreationResult {
+  cancelled: boolean;
+  commandId: string;
+  sessionId: string;
+  sessionPath?: string;
+}
+
 export interface WorkspaceSelectionResult {
   cancelled?: boolean;
   path?: string;
@@ -234,7 +241,7 @@ export class WebClient {
   }
 
   createSession(workspacePath: string, commandId: string) {
-    return this.request<SessionMutationResult>("/api/sessions", {
+    return this.request<SessionCreationResult>("/api/sessions", {
       method: "POST",
       body: JSON.stringify({ workspacePath, commandId }),
     });
diff --git a/web/ui/src/store/web-store.ts b/web/ui/src/store/web-store.ts
index ba6ebb6a..5658f9a2 100644
--- a/web/ui/src/store/web-store.ts
+++ b/web/ui/src/store/web-store.ts
@@ -90,7 +90,14 @@ interface SessionActivation {
   kind: "create" | "select";
   commandId?: string;
   expectedPath: string | null;
-  observedPath?: string | null;
+  expectedSessionId?: string;
+}
+
+interface SessionTarget {
+  epoch: number;
+  sessionId: string;
+  sessionPath: string | null;
+  workspacePath: string;
 }
 
 export interface CommandDiscoveryState {
@@ -154,7 +161,7 @@ export interface WebStoreActions {
   setWorkspace: (path: string | null) => void;
   renameWorkspace: (path: string, name: string) => Promise<void>;
   removeWorkspace: (path: string) => Promise<void>;
-  createSession: (workspacePath: string) => Promise<boolean>;
+  createSession: (workspacePath: string) => Promise<SessionTarget | null>;
   selectSession: (path: string) => Promise<void>;
   renameSession: (path: string, name: string) => Promise<void>;
   archiveSession: (path: string) => Promise<void>;
@@ -221,6 +228,7 @@ export function createWebStore(
     optimisticKey: string;
   } | null = null;
   let sessionActivation: SessionActivation | null = null;
+  let creationRetry: { workspacePath: string; commandId: string } | null = null;
   let sessionSelectionTail = Promise.resolve();
   let refreshTimer: number | null = null;
   let refreshInFlight = false;
@@ -306,6 +314,19 @@ export function createWebStore(
       });
     };
 
+    const targetMatchesSnapshot = (target: SessionTarget) => {
+      const snapshot = get().snapshot;
+      return (
+        target.epoch === sessionEpoch &&
+        get().selectedWorkspace === target.workspacePath &&
+        snapshot?.currentSessionId === target.sessionId &&
+        snapshot.selectedSession?.id === target.sessionId &&
+        snapshot.selectedSession.cwd === target.workspacePath &&
+        (!target.sessionPath ||
+          snapshot.selectedSession.path === target.sessionPath)
+      );
+    };
+
     const clearCommandDiscovery = () => {
       commandDiscoveryGeneration++;
       commandDiscoveryController?.abort();
@@ -619,16 +640,19 @@ export function createWebStore(
           sessionActivation?.kind === "create" &&
           sessionActivation.commandId === eventCommandId &&
           event.type === "session_switched" &&
-          typeof eventPath === "string" &&
-          !knownPath
+          typeof eventSessionId === "string" &&
+          (!sessionActivation.expectedSessionId ||
+            sessionActivation.expectedSessionId === eventSessionId) &&
+          (typeof eventPath !== "string" || !knownPath)
         ) {
-          sessionActivation.observedPath = eventPath;
           belongs = true;
         } else if (
           sessionActivation?.kind === "create" &&
           sessionActivation.commandId === eventCommandId &&
           event.type === "session_created" &&
-          typeof sessionActivation.observedPath === "string"
+          typeof eventSessionId === "string" &&
+          (!sessionActivation.expectedSessionId ||
+            eventSessionId === sessionActivation.expectedSessionId)
         ) {
           belongs = true;
         }
@@ -816,7 +840,7 @@ export function createWebStore(
             cursor: get().cursor ?? 0,
             onConnected: () => {
               reconnectDelay = 500;
-              set({ connection: "connected", notice: null });
+              set({ connection: "connected" });
             },
             onEvent: applyRuntimeEvent,
             onHeartbeat: () => scheduleSnapshotRefresh(0),
@@ -973,6 +997,7 @@ export function createWebStore(
         if (path === current.selectedWorkspace && !current.sessionSwitching)
           return;
         ++sessionEpoch;
+        creationRetry = null;
         resetThinking();
         clearCommandDiscovery();
         promptAdmissionToken = null;
@@ -1019,14 +1044,18 @@ export function createWebStore(
         }
       },
       async createSession(workspacePath) {
-        if (!workspacePath || get().modelSelectionPending) return false;
+        if (!workspacePath || get().modelSelectionPending) return null;
         const current = get();
         const epoch = ++sessionEpoch;
         resetThinking();
         clearCommandDiscovery();
         const commandId =
+          (creationRetry?.workspacePath === workspacePath
+            ? creationRetry.commandId
+            : undefined) ??
           globalThis.crypto?.randomUUID?.() ??
           `web-create-${Date.now()}-${epoch}`;
+        creationRetry = { workspacePath, commandId };
         promptAdmissionToken = null;
         promptAdmission = null;
         set({
@@ -1046,7 +1075,7 @@ export function createWebStore(
           workspaceDraft: true,
           sessionSwitching: true,
         });
-        let created = false;
+        let created: SessionTarget | null = null;
         const creation = sessionSelectionTail.then(async () => {
           if (epoch !== sessionEpoch) return;
           sessionActivation = {
@@ -1054,20 +1083,33 @@ export function createWebStore(
             epoch,
             expectedPath: null,
             kind: "create",
-            observedPath: null,
           };
           try {
-            const receipt = await client.createSession(
-              workspacePath,
-              commandId,
-            );
+            const result = await client.createSession(workspacePath, commandId);
             if (epoch !== sessionEpoch) return;
-            if (receipt.cancelled || !receipt.sessionPath) {
+            if (
+              result.cancelled ||
+              result.commandId !== commandId ||
+              typeof result.sessionId !== "string" ||
+              !result.sessionId ||
+              result.sessionId.length > 128 ||
+              (result.sessionPath !== undefined && !result.sessionPath)
+            ) {
               throw new Error(
-                "Session creation was not confirmed. Please try again.",
+                "Session creation did not return a valid target identity.",
               );
             }
-            set({ selectedPath: null });
+            const target: SessionTarget = {
+              epoch,
+              sessionId: result.sessionId,
+              sessionPath: result.sessionPath ?? null,
+              workspacePath,
+            };
+            if (sessionActivation?.epoch === epoch) {
+              sessionActivation.expectedSessionId = target.sessionId;
+              sessionActivation.expectedPath = target.sessionPath;
+            }
+            set({ selectedPath: target.sessionPath });
             let refreshed = await actions.refreshSnapshot({ epoch });
             if (!refreshed && epoch === sessionEpoch) {
               // A Session event may start a newer snapshot while this
@@ -1081,23 +1123,31 @@ export function createWebStore(
                 "The created Session could not be confirmed. Please try again.",
               );
             }
-            const selected = get().snapshot?.selectedSession;
-            // A successful HTTP response alone cannot authorize a prompt:
-            // another browser may have activated a different Session meanwhile.
-            if (
-              !selected ||
-              selected.path !== receipt.sessionPath ||
-              selected.cwd !== workspacePath ||
-              selected.id !== get().snapshot?.currentSessionId
-            ) {
-              throw new Error(
-                "The created Session is no longer active in the selected workspace. Please try again.",
+            if (!targetMatchesSnapshot(target)) {
+              creationRetry = null;
+              showError(
+                new Error(
+                  "The created Session is no longer active in the selected workspace. Please try again.",
+                ),
               );
+              return;
             }
             set({ workspaceDraft: false, notice: null });
             const draft = get().draftModel;
-            const sessionId = selected.id;
-            created = !draft || (await applyModel(draft, epoch, sessionId));
+            if (draft && !(await applyModel(draft, epoch, target.sessionId))) {
+              return;
+            }
+            if (get().workspaceDraft || !targetMatchesSnapshot(target)) {
+              creationRetry = null;
+              showError(
+                new Error(
+                  "The created Session is no longer active in the selected workspace. Please try again.",
+                ),
+              );
+              return;
+            }
+            created = target;
+            creationRetry = null;
           } catch (error) {
             if (epoch !== sessionEpoch) return;
             set({ selectedPath: null });
@@ -1111,10 +1161,11 @@ export function createWebStore(
         });
         sessionSelectionTail = creation.catch(() => undefined);
         await creation;
-        return created && epoch === sessionEpoch;
+        return epoch === sessionEpoch ? created : null;
       },
       async selectSession(path) {
         if (!path) return;
+        creationRetry = null;
         const current = get();
         clearCommandDiscovery();
         set({
@@ -1352,15 +1403,34 @@ export function createWebStore(
         }
         const creating =
           get().workspaceDraft || !get().snapshot?.selectedSession?.id;
-        if (creating && !(await actions.createSession(workspace))) return false;
+        const createdTarget = creating
+          ? await actions.createSession(workspace)
+          : null;
+        if (creating && !createdTarget) {
+          if (!get().notice) {
+            set({
+              notice:
+                "The active Session changed before the first message was sent. Your message was not sent.",
+            });
+          }
+          return false;
+        }
         if (creating && get().draftModel) return false;
-        const sessionId = get().snapshot?.selectedSession?.id;
+        const selectedSession = get().snapshot?.selectedSession;
+        const target =
+          createdTarget ??
+          (selectedSession
+            ? {
+                epoch: sessionEpoch,
+                sessionId: selectedSession.id,
+                sessionPath: selectedSession.path,
+                workspacePath: workspace,
+              }
+            : null);
         if (
-          !sessionId ||
+          !target ||
           get().workspaceDraft ||
-          get().selectedWorkspace !== workspace ||
-          get().snapshot?.selectedSession?.cwd !== workspace ||
-          sessionId !== get().snapshot?.currentSessionId ||
+          !targetMatchesSnapshot(target) ||
           get().sessionSwitching ||
           get().promptAdmissionPending ||
           (replacement &&
@@ -1370,16 +1440,12 @@ export function createWebStore(
         ) {
           return false;
         }
-        const epoch = sessionEpoch;
+        const { epoch, sessionId } = target;
         const draft = get().draftModel;
         if (draft && !(await applyModel(draft, epoch, sessionId))) return false;
         if (
-          epoch !== sessionEpoch ||
-          sessionId !== get().snapshot?.selectedSession?.id ||
-          sessionId !== get().snapshot?.currentSessionId ||
           get().workspaceDraft ||
-          get().selectedWorkspace !== workspace ||
-          get().snapshot?.selectedSession?.cwd !== workspace ||
+          !targetMatchesSnapshot(target) ||
           (replacement &&
             (get().promptAdmissionRecovery?.commandId !==
               replacement.commandId ||