diff --git a/CLAUDE.md b/CLAUDE.md
index 3414de2a9..a31381bc4 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -263,6 +263,18 @@ Feature flags control which functionality is enabled at runtime. 代码中统一
 
 被迫 mock 的根源：`log.ts` / `debug.ts` → `bootstrap/state.ts`（模块级 `realpathSync` / `randomUUID` 副作用）。必须 mock 的模块：`log.ts`、`debug.ts`、`bun:bundle`、`settings/settings.js`、`config.ts`、`auth.ts`、第三方网络库。
 
+**`log.ts` 和 `debug.ts` 使用共享 mock**（`tests/mocks/log.ts` / `tests/mocks/debug.ts`），不要在测试文件中内联 mock 定义。使用方式：
+
+```ts
+import { logMock } from "../../../tests/mocks/log";
+mock.module("src/utils/log.ts", logMock);
+
+import { debugMock } from "../../../../tests/mocks/debug";
+mock.module("src/utils/debug.ts", debugMock);
+```
+
+源文件导出变更时只需更新 `tests/mocks/` 下的对应文件，不需要逐个修改测试。
+
 不要 mock：纯函数模块（`errors.ts`、`stringUtils.js`）、mock 值与真实实现相同的模块、mock 路径与实际 import 不匹配的模块。
 
 路径规则：统一用 `.ts` 扩展名 + `src/*` 别名路径，禁止双重 mock 同一模块。
diff --git a/packages/builtin-tools/src/tools/AgentTool/__tests__/agentToolUtils.test.ts b/packages/builtin-tools/src/tools/AgentTool/__tests__/agentToolUtils.test.ts
index 21d8a70a0..90525baad 100644
--- a/packages/builtin-tools/src/tools/AgentTool/__tests__/agentToolUtils.test.ts
+++ b/packages/builtin-tools/src/tools/AgentTool/__tests__/agentToolUtils.test.ts
@@ -1,4 +1,5 @@
 import { mock, describe, expect, test } from "bun:test";
+import { debugMock } from "../../../../../../tests/mocks/debug";
 
 // ─── Mocks for agentToolUtils.ts dependencies ───
 // Only mock modules that are truly unavailable or cause side effects.
@@ -87,20 +88,7 @@ mock.module("src/tasks/LocalAgentTask/LocalAgentTask.js", () => ({
   updateProgressFromMessage: noop,
 }));
 
-mock.module("src/utils/debug.ts", () => ({
-  getMinDebugLogLevel: () => "warn",
-  isDebugMode: () => false,
-  enableDebugLogging: () => false,
-  getDebugFilter: () => null,
-  isDebugToStdErr: () => false,
-  getDebugFilePath: () => null,
-  setHasFormattedOutput: noop,
-  getHasFormattedOutput: () => false,
-  flushDebugLogs: async () => {},
-  logForDebugging: noop,
-  getDebugLogPath: () => "",
-  logAntError: noop,
-}));
+mock.module("src/utils/debug.ts", debugMock);
 
 mock.module("src/utils/errors.js", () => ({
   ClaudeError: class extends Error {},
diff --git a/packages/builtin-tools/src/tools/CtxInspectTool/__tests__/CtxInspectTool.test.ts b/packages/builtin-tools/src/tools/CtxInspectTool/__tests__/CtxInspectTool.test.ts
index 36b842e4c..5270b50f0 100644
--- a/packages/builtin-tools/src/tools/CtxInspectTool/__tests__/CtxInspectTool.test.ts
+++ b/packages/builtin-tools/src/tools/CtxInspectTool/__tests__/CtxInspectTool.test.ts
@@ -1,21 +1,7 @@
 import { afterEach, beforeEach, describe, expect, mock, test } from 'bun:test'
+import { logMock } from '../../../../../../tests/mocks/log'
 
-mock.module('src/utils/log.ts', () => ({
-  logError: () => {},
-  logToFile: () => {},
-  getLogDisplayTitle: () => '',
-  logEvent: () => {},
-  logMCPError: () => {},
-  logMCPDebug: () => {},
-  dateToFilename: (d: Date) => d.toISOString().replace(/[:.]/g, '-'),
-  getLogFilePath: () => '/tmp/mock-log',
-  attachErrorLogSink: () => {},
-  getInMemoryErrors: () => [],
-  loadErrorLogs: async () => [],
-  getErrorLogByIndex: async () => null,
-  captureAPIRequest: () => {},
-  _resetErrorLogForTesting: () => {},
-}))
+mock.module('src/utils/log.ts', logMock)
 
 mock.module('src/services/tokenEstimation.ts', () => ({
   roughTokenCountEstimation: (text: string) => Math.ceil(text.length / 4),
diff --git a/packages/builtin-tools/src/tools/FileEditTool/__tests__/utils.test.ts b/packages/builtin-tools/src/tools/FileEditTool/__tests__/utils.test.ts
index 1cfab5fab..eca237141 100644
--- a/packages/builtin-tools/src/tools/FileEditTool/__tests__/utils.test.ts
+++ b/packages/builtin-tools/src/tools/FileEditTool/__tests__/utils.test.ts
@@ -1,22 +1,8 @@
 import { mock, describe, expect, test } from "bun:test";
+import { logMock } from "../../../../../../tests/mocks/log";
 
 // Mock log.ts to cut the heavy dependency chain
-mock.module("src/utils/log.ts", () => ({
-  logError: () => {},
-  logToFile: () => {},
-  getLogDisplayTitle: () => "",
-  logEvent: () => {},
-  logMCPError: () => {},
-  logMCPDebug: () => {},
-  dateToFilename: (d: Date) => d.toISOString().replace(/[:.]/g, "-"),
-  getLogFilePath: () => "/tmp/mock-log",
-  attachErrorLogSink: () => {},
-  getInMemoryErrors: () => [],
-  loadErrorLogs: async () => [],
-  getErrorLogByIndex: async () => null,
-  captureAPIRequest: () => {},
-  _resetErrorLogForTesting: () => {},
-}));
+mock.module("src/utils/log.ts", logMock);
 
 const {
   normalizeQuotes,
diff --git a/packages/builtin-tools/src/tools/LSPTool/__tests__/formatters.test.ts b/packages/builtin-tools/src/tools/LSPTool/__tests__/formatters.test.ts
index 325900079..035cf88cc 100644
--- a/packages/builtin-tools/src/tools/LSPTool/__tests__/formatters.test.ts
+++ b/packages/builtin-tools/src/tools/LSPTool/__tests__/formatters.test.ts
@@ -1,9 +1,7 @@
 import { mock, describe, expect, test } from "bun:test";
+import { debugMock } from "../../../../../../tests/mocks/debug";
 
-mock.module("src/utils/debug.ts", () => ({
-  logForDebugging: () => {},
-  isDebugMode: () => false,
-}));
+mock.module("src/utils/debug.ts", debugMock);
 
 const {
   formatGoToDefinitionResult,
diff --git a/src/services/langfuse/__tests__/langfuse.test.ts b/src/services/langfuse/__tests__/langfuse.test.ts
index 8d9d0f535..48afa2372 100644
--- a/src/services/langfuse/__tests__/langfuse.test.ts
+++ b/src/services/langfuse/__tests__/langfuse.test.ts
@@ -1,4 +1,5 @@
 import { mock, describe, test, expect, beforeEach } from 'bun:test'
+import { debugMock } from '../../../../tests/mocks/debug'
 
 // Mock @langfuse/otel before any imports
 const mockForceFlush = mock(() => Promise.resolve())
@@ -71,9 +72,7 @@ mock.module('@langfuse/tracing', () => ({
 }))
 
 // Mock debug logger
-mock.module('src/utils/debug.ts', () => ({
-  logForDebugging: mock(() => {}),
-}))
+mock.module('src/utils/debug.ts', debugMock)
 
 // Mock user data — resolveLangfuseUserId uses getCoreUserData().email and .deviceId
 mock.module('src/utils/user.js', () => ({
diff --git a/src/services/mcp/__tests__/officialRegistry.test.ts b/src/services/mcp/__tests__/officialRegistry.test.ts
index 12ce50184..bcc9da35d 100644
--- a/src/services/mcp/__tests__/officialRegistry.test.ts
+++ b/src/services/mcp/__tests__/officialRegistry.test.ts
@@ -1,11 +1,10 @@
 import { mock, describe, expect, test, afterEach } from "bun:test";
+import { debugMock } from "../../../../tests/mocks/debug";
 
 mock.module("axios", () => ({
   default: { get: async () => ({ data: { servers: [] } }) },
 }));
-mock.module("src/utils/debug.ts", () => ({
-  logForDebugging: () => {},
-}));
+mock.module("src/utils/debug.ts", debugMock);
 
 const { isOfficialMcpUrl, resetOfficialMcpUrlsForTesting } = await import(
   "../officialRegistry"
diff --git a/src/utils/__tests__/envValidation.test.ts b/src/utils/__tests__/envValidation.test.ts
index 984d5cfde..0ef8d18dd 100644
--- a/src/utils/__tests__/envValidation.test.ts
+++ b/src/utils/__tests__/envValidation.test.ts
@@ -1,20 +1,8 @@
 import { mock, describe, expect, test } from "bun:test";
+import { debugMock } from "../../../tests/mocks/debug";
 
 // Mock debug.ts to cut bootstrap/state dependency chain
-mock.module("src/utils/debug.ts", () => ({
-  logForDebugging: () => {},
-  isDebugMode: () => false,
-  isDebugToStdErr: () => false,
-  getDebugFilePath: () => null,
-  getDebugFilter: () => null,
-  getMinDebugLogLevel: () => "debug",
-  getDebugLogPath: () => "/tmp/mock-debug.log",
-  flushDebugLogs: async () => {},
-  enableDebugLogging: () => false,
-  setHasFormattedOutput: () => {},
-  getHasFormattedOutput: () => false,
-  logAntError: () => {},
-}));
+mock.module("src/utils/debug.ts", debugMock);
 
 const { validateBoundedIntEnvVar } = await import("../envValidation");
 
diff --git a/src/utils/__tests__/json.test.ts b/src/utils/__tests__/json.test.ts
index 42a624b10..1d4b441f9 100644
--- a/src/utils/__tests__/json.test.ts
+++ b/src/utils/__tests__/json.test.ts
@@ -1,12 +1,8 @@
 import { mock, describe, expect, test } from "bun:test";
+import { logMock } from "../../../tests/mocks/log";
 
 // Mock log.ts to cut the heavy dependency chain (log.ts → bootstrap/state.ts → analytics)
-mock.module("src/utils/log.ts", () => ({
-  logError: () => {},
-  logToFile: () => {},
-  getLogDisplayTitle: () => "",
-  logEvent: () => {},
-}));
+mock.module("src/utils/log.ts", logMock);
 
 const { safeParseJSON, safeParseJSONC, parseJSONL, addItemToJSONCArray } =
   await import("../json");
diff --git a/src/utils/__tests__/memoize.test.ts b/src/utils/__tests__/memoize.test.ts
index 4cdff9968..41e4a3349 100644
--- a/src/utils/__tests__/memoize.test.ts
+++ b/src/utils/__tests__/memoize.test.ts
@@ -1,12 +1,8 @@
 import { mock, describe, expect, test, beforeEach } from "bun:test";
+import { logMock } from "../../../tests/mocks/log";
 
 // Mock log.ts to cut the bootstrap/state dependency chain
-mock.module("src/utils/log.ts", () => ({
-  logError: () => {},
-  logToFile: () => {},
-  getLogDisplayTitle: () => "",
-  logEvent: () => {},
-}));
+mock.module("src/utils/log.ts", logMock);
 
 const { memoizeWithTTL, memoizeWithTTLAsync, memoizeWithLRU } = await import(
   "../memoize"
diff --git a/src/utils/__tests__/tokens.test.ts b/src/utils/__tests__/tokens.test.ts
index 4e7b905c5..cf3eba2bb 100644
--- a/src/utils/__tests__/tokens.test.ts
+++ b/src/utils/__tests__/tokens.test.ts
@@ -1,22 +1,8 @@
 import { mock, describe, expect, test } from "bun:test";
+import { logMock } from "../../../tests/mocks/log";
 
 // Mock heavy dependency chain: tokenEstimation.ts → log.ts → bootstrap/state.ts
-mock.module("src/utils/log.ts", () => ({
-  logError: () => {},
-  logToFile: () => {},
-  getLogDisplayTitle: () => "",
-  logEvent: () => {},
-  logMCPError: () => {},
-  logMCPDebug: () => {},
-  dateToFilename: (d: Date) => d.toISOString().replace(/[:.]/g, "-"),
-  getLogFilePath: () => "/tmp/mock-log",
-  attachErrorLogSink: () => {},
-  getInMemoryErrors: () => [],
-  loadErrorLogs: async () => [],
-  getErrorLogByIndex: async () => null,
-  captureAPIRequest: () => {},
-  _resetErrorLogForTesting: () => {},
-}));
+mock.module("src/utils/log.ts", logMock);
 
 // Mock tokenEstimation to avoid pulling in API provider deps
 mock.module("src/services/tokenEstimation.ts", () => ({
diff --git a/src/utils/permissions/__tests__/PermissionMode.test.ts b/src/utils/permissions/__tests__/PermissionMode.test.ts
index d07596d16..0f2d065d9 100644
--- a/src/utils/permissions/__tests__/PermissionMode.test.ts
+++ b/src/utils/permissions/__tests__/PermissionMode.test.ts
@@ -1,11 +1,7 @@
 import { mock, describe, expect, test, beforeEach, afterEach } from "bun:test";
+import { logMock } from "../../../../tests/mocks/log";
 
-mock.module("src/utils/log.ts", () => ({
-  logError: () => {},
-  logToFile: () => {},
-  getLogDisplayTitle: () => "",
-  logEvent: () => {},
-}));
+mock.module("src/utils/log.ts", logMock);
 
 const {
   isExternalPermissionMode,
diff --git a/src/utils/permissions/__tests__/permissions.test.ts b/src/utils/permissions/__tests__/permissions.test.ts
index 01b6ace54..d83c2b153 100644
--- a/src/utils/permissions/__tests__/permissions.test.ts
+++ b/src/utils/permissions/__tests__/permissions.test.ts
@@ -1,24 +1,10 @@
 import { mock, describe, expect, test } from 'bun:test'
+import { logMock } from '../../../../tests/mocks/log'
 import { createFileStateCacheWithSizeLimit } from '../../../utils/fileStateCache.js'
 import { createSubagentContext } from '../../../utils/forkedAgent.js'
 import { getEmptyToolPermissionContext } from '../../../Tool.js'
 
-mock.module('src/utils/log.ts', () => ({
-  logError: () => {},
-  logToFile: () => {},
-  getLogDisplayTitle: () => '',
-  logEvent: () => {},
-  logMCPError: () => {},
-  logMCPDebug: () => {},
-  dateToFilename: (d: Date) => d.toISOString().replace(/[:.]/g, '-'),
-  getLogFilePath: () => '/tmp/mock-log',
-  attachErrorLogSink: () => {},
-  getInMemoryErrors: () => [],
-  loadErrorLogs: async () => [],
-  getErrorLogByIndex: async () => null,
-  captureAPIRequest: () => {},
-  _resetErrorLogForTesting: () => {},
-}))
+mock.module('src/utils/log.ts', logMock)
 
 const {
   getDenyRuleForTool,
diff --git a/src/utils/shell/__tests__/outputLimits.test.ts b/src/utils/shell/__tests__/outputLimits.test.ts
index 7abd319ff..b1418418e 100644
--- a/src/utils/shell/__tests__/outputLimits.test.ts
+++ b/src/utils/shell/__tests__/outputLimits.test.ts
@@ -1,20 +1,8 @@
 import { mock, describe, expect, test, afterEach } from "bun:test";
+import { debugMock } from "../../../../tests/mocks/debug";
 
 // Mock debug.ts to cut the bootstrap/state dependency chain
-mock.module("src/utils/debug.ts", () => ({
-  logForDebugging: () => {},
-  isDebugMode: () => false,
-  isDebugToStdErr: () => false,
-  getDebugFilePath: () => null,
-  getDebugFilter: () => null,
-  getMinDebugLogLevel: () => "debug",
-  getDebugLogPath: () => "/tmp/mock-debug.log",
-  flushDebugLogs: async () => {},
-  enableDebugLogging: () => false,
-  setHasFormattedOutput: () => {},
-  getHasFormattedOutput: () => false,
-  logAntError: () => {},
-}));
+mock.module("src/utils/debug.ts", debugMock);
 
 const {
   getMaxOutputLength,
diff --git a/tests/mocks/debug.ts b/tests/mocks/debug.ts
new file mode 100644
index 000000000..0dc981668
--- /dev/null
+++ b/tests/mocks/debug.ts
@@ -0,0 +1,25 @@
+/**
+ * Shared mock for src/utils/debug.ts
+ *
+ * Cuts the bootstrap/state.ts dependency chain (module-level realpathSync + randomUUID).
+ * Must be called via mock.module("src/utils/debug.ts", debugMock) BEFORE any import that
+ * transitively depends on debug.ts.
+ *
+ * Exported as a factory so each call produces a fresh object (mock.module requirement).
+ */
+export function debugMock() {
+  return {
+    getMinDebugLogLevel: () => "debug" as const,
+    isDebugMode: () => false,
+    enableDebugLogging: () => false,
+    getDebugFilter: () => null,
+    isDebugToStdErr: () => false,
+    getDebugFilePath: () => null as string | null,
+    setHasFormattedOutput: () => {},
+    getHasFormattedOutput: () => false,
+    flushDebugLogs: async () => {},
+    logForDebugging: () => {},
+    getDebugLogPath: () => "/tmp/mock-debug.log",
+    logAntError: () => {},
+  }
+}
diff --git a/tests/mocks/log.ts b/tests/mocks/log.ts
new file mode 100644
index 000000000..6661a0971
--- /dev/null
+++ b/tests/mocks/log.ts
@@ -0,0 +1,24 @@
+/**
+ * Shared mock for src/utils/log.ts
+ *
+ * Cuts the bootstrap/state.ts dependency chain (module-level realpathSync + randomUUID).
+ * Must be called via mock.module("src/utils/log.ts", logMock) BEFORE any import that
+ * transitively depends on log.ts.
+ *
+ * Exported as a factory so each call produces a fresh object (mock.module requirement).
+ */
+export function logMock() {
+  return {
+    logError: () => {},
+    getLogDisplayTitle: () => "",
+    dateToFilename: (d: Date) => d.toISOString().replace(/[:.]/g, "-"),
+    attachErrorLogSink: () => {},
+    getInMemoryErrors: () => [] as Array<{ error: string; timestamp: string }>,
+    loadErrorLogs: async () => [],
+    getErrorLogByIndex: async () => null,
+    logMCPError: () => {},
+    logMCPDebug: () => {},
+    captureAPIRequest: () => {},
+    _resetErrorLogForTesting: () => {},
+  }
+}