diff --git a/packages/core/src/config/config-session-env.test.ts b/packages/core/src/config/config-session-env.test.ts
new file mode 100644
index 00000000000..8f300eacb27
--- /dev/null
+++ b/packages/core/src/config/config-session-env.test.ts
@@ -0,0 +1,172 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+
+/**
+ * Tests for the module-level `sessionEnvClaimed` guard in Config.
+ *
+ * The guard ensures that only the first Config instance in a process sets
+ * `process.env['QWEN_CODE_SESSION_ID']`, preventing throwaway instances
+ * (e.g. telemetry-only) from overwriting the real session's ID.
+ *
+ * We use `vi.isolateModules` to get a fresh module scope (resetting the
+ * module-level flag) for each test.
+ */
+
+// Shared mocks needed by Config constructor
+vi.mock('node:fs');
+vi.mock('node:fs/promises');
+vi.mock('../telemetry/index.js', () => ({
+  QwenLogger: vi.fn().mockImplementation(() => ({
+    logStartSessionEvent: vi.fn().mockResolvedValue(undefined),
+    logEndSessionEvent: vi.fn().mockResolvedValue(undefined),
+    shutdown: vi.fn().mockResolvedValue(undefined),
+  })),
+  DEFAULT_TELEMETRY_TARGET: 'none',
+  DEFAULT_OTLP_ENDPOINT: '',
+  isTelemetrySdkInitialized: vi.fn().mockReturnValue(false),
+  shutdownTelemetry: vi.fn().mockResolvedValue(undefined),
+  refreshSessionContext: vi.fn(),
+}));
+vi.mock('../core/contentGenerator.js', () => ({
+  resolveContentGeneratorConfigWithSources: vi.fn().mockReturnValue({
+    config: { model: 'test-model', apiKey: 'test-key' },
+    sources: {},
+  }),
+  createContentGeneratorConfig: vi.fn().mockReturnValue({}),
+  createContentGenerator: vi.fn().mockReturnValue({}),
+  AuthType: { API_KEY: 'apiKey' },
+}));
+vi.mock('../core/baseLlmClient.js');
+vi.mock('../core/toolHookTriggers.js', () => ({
+  fireNotificationHook: vi.fn().mockResolvedValue({}),
+}));
+vi.mock('../services/skillManager.js', () => {
+  const SkillManagerMock = vi.fn();
+  SkillManagerMock.prototype.startWatching = vi
+    .fn()
+    .mockResolvedValue(undefined);
+  SkillManagerMock.prototype.refreshCache = vi
+    .fn()
+    .mockResolvedValue(undefined);
+  SkillManagerMock.prototype.stopWatching = vi.fn();
+  SkillManagerMock.prototype.listSkills = vi.fn().mockResolvedValue([]);
+  SkillManagerMock.prototype.addChangeListener = vi.fn();
+  SkillManagerMock.prototype.removeChangeListener = vi.fn();
+  SkillManagerMock.prototype.matchAndActivateByPath = vi
+    .fn()
+    .mockResolvedValue([]);
+  SkillManagerMock.prototype.matchAndActivateByPaths = vi
+    .fn()
+    .mockResolvedValue([]);
+  return { SkillManager: SkillManagerMock };
+});
+vi.mock('../subagents/subagent-manager.js', () => {
+  const SubagentManagerMock = vi.fn();
+  SubagentManagerMock.prototype.loadSessionSubagents = vi.fn();
+  SubagentManagerMock.prototype.addChangeListener = vi
+    .fn()
+    .mockReturnValue(() => {});
+  SubagentManagerMock.prototype.listSubagents = vi.fn().mockResolvedValue([]);
+  return { SubagentManager: SubagentManagerMock };
+});
+vi.mock('../ide/ide-client.js', () => ({
+  IdeClient: {
+    getInstance: vi.fn().mockResolvedValue({
+      getConnectionStatus: vi.fn(),
+      initialize: vi.fn(),
+      shutdown: vi.fn(),
+    }),
+  },
+}));
+vi.mock('../memory/const.js', () => ({
+  setGeminiMdFilename: vi.fn(),
+}));
+
+import * as fs from 'node:fs';
+import type { Mock } from 'vitest';
+import type { ConfigParameters } from './config.js';
+
+const baseParams: ConfigParameters = {
+  cwd: '/tmp',
+  targetDir: '/tmp',
+  debugMode: false,
+  model: 'test-model',
+  telemetry: { enabled: false },
+  usageStatisticsEnabled: false,
+  overrideExtensions: [],
+};
+
+describe('Config sessionEnvClaimed guard', () => {
+  let originalEnv: string | undefined;
+
+  beforeEach(() => {
+    originalEnv = process.env['QWEN_CODE_SESSION_ID'];
+    delete process.env['QWEN_CODE_SESSION_ID'];
+
+    (fs.existsSync as Mock).mockReturnValue(true);
+    (fs.readdirSync as Mock).mockReturnValue([]);
+    (fs.statSync as Mock).mockReturnValue({
+      isDirectory: vi.fn().mockReturnValue(true),
+    });
+    vi.mocked(fs.realpathSync).mockImplementation((p) => String(p));
+    (fs.mkdirSync as Mock).mockImplementation(() => undefined);
+    (fs.writeFileSync as Mock).mockImplementation(() => undefined);
+    (fs.renameSync as Mock).mockImplementation(() => undefined);
+    (fs.copyFileSync as Mock).mockImplementation(() => undefined);
+    (fs.unlinkSync as Mock).mockImplementation(() => undefined);
+    (fs.readFileSync as Mock).mockImplementation(() => undefined);
+  });
+
+  afterEach(() => {
+    if (originalEnv !== undefined) {
+      process.env['QWEN_CODE_SESSION_ID'] = originalEnv;
+    } else {
+      delete process.env['QWEN_CODE_SESSION_ID'];
+    }
+    vi.resetModules();
+  });
+
+  it('first Config sets process.env QWEN_CODE_SESSION_ID to its sessionId', async () => {
+    const { Config } = await import('./config.js');
+    const config = new Config({ ...baseParams });
+
+    expect(process.env['QWEN_CODE_SESSION_ID']).toBe(config.getSessionId());
+  });
+
+  it('subsequent Config does not overwrite the env var set by the first', async () => {
+    const { Config } = await import('./config.js');
+    const firstConfig = new Config({ ...baseParams });
+    const firstSessionId = firstConfig.getSessionId();
+
+    // Second Config (e.g. telemetry-only throwaway instance)
+    const secondConfig = new Config({
+      ...baseParams,
+      sessionId: 'throwaway-session-id',
+    });
+
+    // The env var should still be the first config's session ID
+    expect(process.env['QWEN_CODE_SESSION_ID']).toBe(firstSessionId);
+    expect(process.env['QWEN_CODE_SESSION_ID']).not.toBe(
+      secondConfig.getSessionId(),
+    );
+  });
+
+  it('startNewSession updates env var to the new session ID', async () => {
+    const { Config } = await import('./config.js');
+    const config = new Config({ ...baseParams });
+    const originalSessionId = config.getSessionId();
+
+    expect(process.env['QWEN_CODE_SESSION_ID']).toBe(originalSessionId);
+
+    // Simulate /clear or session switch
+    config.startNewSession('new-session-uuid-123');
+
+    expect(process.env['QWEN_CODE_SESSION_ID']).toBe('new-session-uuid-123');
+    expect(process.env['QWEN_CODE_SESSION_ID']).not.toBe(originalSessionId);
+  });
+});
diff --git a/packages/core/src/config/config.ts b/packages/core/src/config/config.ts
index 5aade5d0e0e..218b36097ca 100644
--- a/packages/core/src/config/config.ts
+++ b/packages/core/src/config/config.ts
@@ -872,6 +872,12 @@ const DEFAULT_BARE_CORE_TOOLS = [
   ToolNames.SHELL,
 ];
 
+// Tracks whether the first Config in this process has claimed the global
+// QWEN_CODE_SESSION_ID env var. Prevents throwaway Config instances from
+// overwriting the real session's ID while still allowing nested qwen-code
+// processes to claim their own (they start with a fresh module scope).
+let sessionEnvClaimed = false;
+
 export class Config {
   private sessionId: string;
   private sessionData?: ResumedSessionData;
@@ -1074,6 +1080,16 @@ export class Config {
 
   constructor(params: ConfigParameters) {
     this.sessionId = params.sessionId ?? randomUUID();
+    // Only set the global env marker once per process lifetime, so
+    // throwaway Config instances (e.g. telemetry-only) don't clobber
+    // the real interactive session's ID. Uses a module-level flag
+    // rather than checking env existence — otherwise a nested qwen-code
+    // launched from within a session would inherit the parent's ID and
+    // never claim its own.
+    if (!sessionEnvClaimed && process.env) {
+      process.env['QWEN_CODE_SESSION_ID'] = this.sessionId;
+      sessionEnvClaimed = true;
+    }
     this.sessionData = params.sessionData;
     setDebugLogSession(this);
     this.debugLogger = createDebugLogger();
@@ -1986,6 +2002,12 @@ export class Config {
 
     const previousSessionId = this.sessionId;
     this.sessionId = sessionId ?? randomUUID();
+    // Unconditional: startNewSession is only called on the canonical Config
+    // instance (the one that already claimed via sessionEnvClaimed), so this
+    // correctly updates the env var to reflect the new active session.
+    if (process.env) {
+      process.env['QWEN_CODE_SESSION_ID'] = this.sessionId;
+    }
     this.sessionData = sessionData;
     setDebugLogSession(this);
     this.debugLogger = createDebugLogger();
diff --git a/packages/core/src/hooks/hookRunner.ts b/packages/core/src/hooks/hookRunner.ts
index 6f664267d27..630cfcb6693 100644
--- a/packages/core/src/hooks/hookRunner.ts
+++ b/packages/core/src/hooks/hookRunner.ts
@@ -29,6 +29,7 @@ import { FunctionHookRunner } from './functionHookRunner.js';
 import { PromptHookRunner } from './promptHookRunner.js';
 import { AsyncHookRegistry, generateHookId } from './asyncHookRegistry.js';
 import type { Config } from '../config/config.js';
+import { getShellContextEnvVars } from '../utils/shellContextEnv.js';
 
 const debugLogger = createDebugLogger('TRUSTED_HOOKS');
 
@@ -573,6 +574,7 @@ export class HookRunner {
         GEMINI_PROJECT_DIR: input.cwd,
         CLAUDE_PROJECT_DIR: input.cwd, // For compatibility
         QWEN_PROJECT_DIR: input.cwd, // For Qwen Code compatibility
+        ...getShellContextEnvVars(),
         ...hookConfig.env,
       };
 
diff --git a/packages/core/src/services/shellExecutionService.ts b/packages/core/src/services/shellExecutionService.ts
index 2fe8d491fb2..d6be9185dc1 100644
--- a/packages/core/src/services/shellExecutionService.ts
+++ b/packages/core/src/services/shellExecutionService.ts
@@ -21,6 +21,7 @@ import {
   type AnsiOutput,
 } from '../utils/terminalSerializer.js';
 import { normalizePathEnvForWindows } from '../utils/windowsPath.js';
+import { getShellContextEnvVars } from '../utils/shellContextEnv.js';
 import { createDebugLogger } from '../utils/debugLogger.js';
 const { Terminal } = pkg;
 
@@ -550,6 +551,7 @@ export class ShellExecutionService {
           QWEN_CODE: '1',
           TERM: 'xterm-256color',
           PAGER: 'cat',
+          ...getShellContextEnvVars(),
         },
       });
 
@@ -1152,6 +1154,7 @@ export class ShellExecutionService {
           TERM: 'xterm-256color',
           PAGER: shellExecutionConfig.pager ?? 'cat',
           GIT_PAGER: shellExecutionConfig.pager ?? 'cat',
+          ...getShellContextEnvVars(),
         },
         handleFlowControl: true,
       });
diff --git a/packages/core/src/tools/monitor.ts b/packages/core/src/tools/monitor.ts
index e441df10e2a..d0b6ab4d577 100644
--- a/packages/core/src/tools/monitor.ts
+++ b/packages/core/src/tools/monitor.ts
@@ -53,6 +53,7 @@ import {
   isShellCommandReadOnlyAST,
 } from '../utils/shellAstParser.js';
 import { getCurrentAgentId } from '../agents/runtime/agent-context.js';
+import { getShellContextEnvVars } from '../utils/shellContextEnv.js';
 
 const debugLogger = createDebugLogger('MONITOR');
 
@@ -366,6 +367,7 @@ class MonitorToolInvocation extends BaseToolInvocation<
           QWEN_CODE: '1',
           TERM: 'dumb', // no color codes for streaming
           PAGER: 'cat',
+          ...getShellContextEnvVars(),
         },
       });
     } catch (err) {
diff --git a/packages/core/src/utils/shellContextEnv.test.ts b/packages/core/src/utils/shellContextEnv.test.ts
new file mode 100644
index 00000000000..17680915eb6
--- /dev/null
+++ b/packages/core/src/utils/shellContextEnv.test.ts
@@ -0,0 +1,75 @@
+/**
+ * @license
+ * Copyright 2025 Qwen
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, expect, it, beforeEach, afterEach } from 'vitest';
+import { getShellContextEnvVars } from './shellContextEnv.js';
+import { runWithAgentContext } from '../agents/runtime/agent-context.js';
+import { promptIdContext } from './promptIdContext.js';
+
+describe('getShellContextEnvVars', () => {
+  let originalSessionId: string | undefined;
+
+  beforeEach(() => {
+    originalSessionId = process.env['QWEN_CODE_SESSION_ID'];
+    delete process.env['QWEN_CODE_SESSION_ID'];
+  });
+
+  afterEach(() => {
+    if (originalSessionId !== undefined) {
+      process.env['QWEN_CODE_SESSION_ID'] = originalSessionId;
+    } else {
+      delete process.env['QWEN_CODE_SESSION_ID'];
+    }
+  });
+
+  it('returns empty strings for agent/prompt when no context is available', () => {
+    const env = getShellContextEnvVars();
+    expect(env).toEqual({
+      QWEN_CODE_AGENT_ID: '',
+      QWEN_CODE_PROMPT_ID: '',
+    });
+  });
+
+  it('returns QWEN_CODE_SESSION_ID when set in process.env', () => {
+    process.env['QWEN_CODE_SESSION_ID'] = 'test-session-123';
+    const env = getShellContextEnvVars();
+    expect(env['QWEN_CODE_SESSION_ID']).toBe('test-session-123');
+  });
+
+  it('returns QWEN_CODE_AGENT_ID when called within agent context', async () => {
+    const env = await runWithAgentContext('my-agent-42', async () =>
+      getShellContextEnvVars(),
+    );
+    expect(env['QWEN_CODE_AGENT_ID']).toBe('my-agent-42');
+  });
+
+  it('returns QWEN_CODE_PROMPT_ID when called within prompt context', () => {
+    const env = promptIdContext.run('prompt-abc', () =>
+      getShellContextEnvVars(),
+    );
+    expect(env['QWEN_CODE_PROMPT_ID']).toBe('prompt-abc');
+  });
+
+  it('returns all vars when all contexts are active', async () => {
+    process.env['QWEN_CODE_SESSION_ID'] = 'sess-uuid';
+    const env = await runWithAgentContext('agent-xyz', async () =>
+      promptIdContext.run('prompt-456', () => getShellContextEnvVars()),
+    );
+    expect(env).toEqual({
+      QWEN_CODE_SESSION_ID: 'sess-uuid',
+      QWEN_CODE_AGENT_ID: 'agent-xyz',
+      QWEN_CODE_PROMPT_ID: 'prompt-456',
+    });
+  });
+
+  it('sets empty string for agent/prompt to override inherited env', () => {
+    // Simulates a nested qwen-code process where parent injected these
+    const env = getShellContextEnvVars();
+    expect(env['QWEN_CODE_AGENT_ID']).toBe('');
+    expect(env['QWEN_CODE_PROMPT_ID']).toBe('');
+    // Empty strings will overwrite any stale inherited values in process.env
+  });
+});
diff --git a/packages/core/src/utils/shellContextEnv.ts b/packages/core/src/utils/shellContextEnv.ts
new file mode 100644
index 00000000000..7956eecb7dc
--- /dev/null
+++ b/packages/core/src/utils/shellContextEnv.ts
@@ -0,0 +1,41 @@
+/**
+ * @license
+ * Copyright 2025 Qwen
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * Returns context environment variables to inject into shell subprocesses.
+ *
+ * Reads dynamic context (agent ID, prompt ID) from AsyncLocalStorage at
+ * call time, and session ID from process.env (set by Config at session
+ * start). This enables downstream scripts to identify which session,
+ * agent, and prompt triggered their execution — useful for tracing,
+ * audit logging, and business context correlation.
+ *
+ * Must be called at spawn time within the executing async context to
+ * capture the correct agent/prompt frame.
+ */
+
+import { getCurrentAgentId } from '../agents/runtime/agent-context.js';
+import { promptIdContext } from './promptIdContext.js';
+
+export function getShellContextEnvVars(): Record<string, string> {
+  const env: Record<string, string> = {};
+
+  const sessionId = process.env['QWEN_CODE_SESSION_ID'];
+  if (sessionId) {
+    env['QWEN_CODE_SESSION_ID'] = sessionId;
+  }
+
+  // For agent/prompt IDs: explicitly set empty string when no ALS context
+  // exists, so that stale values inherited from a parent qwen-code process
+  // (via process.env spread) are overwritten rather than leaked.
+  const agentId = getCurrentAgentId();
+  env['QWEN_CODE_AGENT_ID'] = agentId ?? '';
+
+  const promptId = promptIdContext.getStore();
+  env['QWEN_CODE_PROMPT_ID'] = promptId ?? '';
+
+  return env;
+}