fix(patch): cherry-pick 02995ba to release/v0.42.0-preview.1-pr-26568 to patch version v0.42.0-preview.1 and create version 0.42.0-preview.2 (#26590)

Co-authored-by: Keith Schaab <keith.schaab@gmail.com>

Author: gemini-cli-robot

packages/a2a-server/src/agent/race-condition.test.ts

@@ -0,0 +1,173 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, vi, beforeEach, type Mock } from 'vitest';
+import { Task } from './task.js';
+import {
+  MessageBusType,
+  CoreToolCallStatus,
+  type Config,
+  type MessageBus,
+} from '@google/gemini-cli-core';
+import { createMockConfig } from '../utils/testing_utils.js';
+import type { RequestContext } from '@a2a-js/sdk/server';
+
+describe('Task Race Condition', () => {
+  let mockConfig: Config;
+  let messageBus: MessageBus;
+
+  beforeEach(() => {
+    messageBus = {
+      subscribe: vi.fn(),
+      unsubscribe: vi.fn(),
+      publish: vi.fn(),
+    } as unknown as MessageBus;
+    mockConfig = createMockConfig({
+      messageBus,
+    }) as Config;
+  });
+
+  it('should not hang when multiple tool confirmations are processed while waiting', async () => {
+    // @ts-expect-error - private constructor
+    const task = new Task('task-id', 'context-id', mockConfig);
+
+    // 1. Register two tools as scheduled
+    task['_registerToolCall']('tool-1', 'scheduled');
+    task['_registerToolCall']('tool-2', 'scheduled');
+
+    // 2. Both transition to awaiting_approval
+    const updateHandler = (messageBus.subscribe as Mock).mock.calls.find(
+      (c: unknown[]) => c[0] === MessageBusType.TOOL_CALLS_UPDATE,
+    )?.[1];
+
+    updateHandler({
+      type: MessageBusType.TOOL_CALLS_UPDATE,
+      schedulerId: 'task-id',
+      toolCalls: [
+        {
+          request: { callId: 'tool-1', name: 't1' },
+          status: CoreToolCallStatus.AwaitingApproval,
+          correlationId: 'corr-1',
+          confirmationDetails: { type: 'info' },
+        },
+        {
+          request: { callId: 'tool-2', name: 't2' },
+          status: CoreToolCallStatus.AwaitingApproval,
+          correlationId: 'corr-2',
+          confirmationDetails: { type: 'info' },
+        },
+      ],
+    });
+
+    // 3. Confirm Tool 1. This makes isAwaitingApprovalOnly() return false.
+    for await (const _ of task.acceptUserMessage(
+      {
+        userMessage: {
+          parts: [
+            {
+              kind: 'data',
+              data: { callId: 'tool-1', outcome: 'proceed_once' },
+            },
+          ],
+        },
+      } as unknown as RequestContext,
+      new AbortController().signal,
+    )) {
+      // consume generator
+    }
+
+    // 4. Start waiting. This should now block because Tool 1 is confirmed (so we are waiting for its execution).
+    const waitPromise = task.waitForPendingTools();
+
+    // 5. Confirm Tool 2 while waiting.
+    for await (const _ of task.acceptUserMessage(
+      {
+        userMessage: {
+          parts: [
+            {
+              kind: 'data',
+              data: { callId: 'tool-2', outcome: 'proceed_once' },
+            },
+          ],
+        },
+      } as unknown as RequestContext,
+      new AbortController().signal,
+    )) {
+      // consume generator
+    }
+
+    // 6. Both tools complete successfully
+    updateHandler({
+      type: MessageBusType.TOOL_CALLS_UPDATE,
+      schedulerId: 'task-id',
+      toolCalls: [
+        {
+          request: { callId: 'tool-1', name: 't1' },
+          status: CoreToolCallStatus.Success,
+          response: { responseParts: [] },
+        },
+        {
+          request: { callId: 'tool-2', name: 't2' },
+          status: CoreToolCallStatus.Success,
+          response: { responseParts: [] },
+        },
+      ],
+    });
+
+    // 7. Verify that the original waitPromise resolves.
+    await expect(waitPromise).resolves.toBeUndefined();
+  });
+
+  it('should reject waitForPendingTools when tools are cancelled', async () => {
+    // @ts-expect-error - private constructor
+    const task = new Task('task-id', 'context-id', mockConfig);
+
+    // 1. Register a tool
+    task['_registerToolCall']('tool-1', 'scheduled');
+
+    // 2. Start waiting
+    const waitPromise = task.waitForPendingTools();
+
+    // 3. Cancel pending tools
+    task.cancelPendingTools('User requested cancellation');
+
+    // 4. Verify waitPromise rejects with the reason
+    await expect(waitPromise).rejects.toThrow('User requested cancellation');
+  });
+
+  it('should handle concurrent tool scheduling correctly', async () => {
+    // @ts-expect-error - private constructor
+    const task = new Task('task-id', 'context-id', mockConfig);
+
+    // 1. Register a tool and start waiting
+    task['_registerToolCall']('tool-1', 'scheduled');
+    const waitPromise = task.waitForPendingTools();
+
+    // 2. Schedule another tool concurrently (e.g. from a secondary user message)
+    // This should NOT resolve the current waitPromise until both are done
+    await task.scheduleToolCalls(
+      [{ callId: 'tool-2', name: 't2', args: {} }],
+      new AbortController().signal,
+    );
+
+    expect(task['pendingToolCalls'].size).toBe(2);
+
+    // 3. Resolve tool 1
+    task['_resolveToolCall']('tool-1');
+
+    // 4. Verify waitPromise is still pending
+    let resolved = false;
+    waitPromise.then(() => (resolved = true));
+    await new Promise((resolve) => setTimeout(resolve, 10));
+    expect(resolved).toBe(false);
+
+    // 5. Resolve tool 2
+    task['_resolveToolCall']('tool-2');
+
+    // 6. Now it should resolve
+    await expect(waitPromise).resolves.toBeUndefined();
+  });
+});

packages/a2a-server/src/agent/task-event-driven.test.ts

@@ -12,6 +12,7 @@ import {
   ApprovalMode,
   Scheduler,
   type MessageBus,
+  type ToolLiveOutput,
 } from '@google/gemini-cli-core';
 import { createMockConfig } from '../utils/testing_utils.js';
 import type { ExecutionEventBus } from '@a2a-js/sdk/server';
@@ -608,6 +609,74 @@ describe('Task Event-Driven Scheduler', () => {
     );
   });
 
+  it('should handle multi-turn tool resolution correctly', async () => {
+    // @ts-expect-error - Calling private constructor
+    const task = new Task('task-id', 'context-id', mockConfig);
+
+    task['_registerToolCall']('1', 'scheduled');
+    task['_registerToolCall']('2', 'scheduled');
+
+    const handler = (messageBus.subscribe as Mock).mock.calls.find(
+      (call: unknown[]) => call[0] === MessageBusType.TOOL_CALLS_UPDATE,
+    )?.[1];
+
+    // Turn 1: Resolve tool 1
+    handler({
+      type: MessageBusType.TOOL_CALLS_UPDATE,
+      toolCalls: [
+        {
+          request: { callId: '1', name: 't1' },
+          status: 'success',
+          response: { responseParts: [] },
+        },
+      ],
+      schedulerId: 'task-id',
+    });
+
+    expect(task['pendingToolCalls'].size).toBe(1);
+    expect(task['pendingToolCalls'].has('2')).toBe(true);
+
+    // Turn 2: Resolve tool 2
+    handler({
+      type: MessageBusType.TOOL_CALLS_UPDATE,
+      toolCalls: [
+        {
+          request: { callId: '2', name: 't2' },
+          status: 'success',
+          response: { responseParts: [] },
+        },
+      ],
+      schedulerId: 'task-id',
+    });
+
+    expect(task['pendingToolCalls'].size).toBe(0);
+  });
+
+  it('should handle subagent progress events from the scheduler', async () => {
+    // @ts-expect-error - Calling private constructor
+    const task = new Task('task-id', 'context-id', mockConfig, mockEventBus);
+
+    // Trigger _schedulerOutputUpdate with subagent progress
+    task['_schedulerOutputUpdate']('tool-1', {
+      isSubagentProgress: true,
+      agentName: 'researcher',
+      recentActivity: [],
+    } as ToolLiveOutput);
+
+    expect(mockEventBus.publish).toHaveBeenCalledWith(
+      expect.objectContaining({
+        kind: 'artifact-update',
+        artifact: expect.objectContaining({
+          parts: [
+            expect.objectContaining({
+              text: expect.stringContaining('researcher'),
+            }),
+          ],
+        }),
+      }),
+    );
+  });
+
   it('should wait for executing tools before transitioning to input-required state', async () => {
     // @ts-expect-error - Calling private constructor
     const task = new Task('task-id', 'context-id', mockConfig, mockEventBus);