diff --git a/src/server/__tests__/conversation-service.test.ts b/src/server/__tests__/conversation-service.test.ts
index 6782ba54..38390642 100644
--- a/src/server/__tests__/conversation-service.test.ts
+++ b/src/server/__tests__/conversation-service.test.ts
@@ -8,6 +8,7 @@ import { ProviderService } from '../services/providerService.js'
 describe('ConversationService', () => {
   let tmpDir: string
   let originalConfigDir: string | undefined
+  let originalApiKey: string | undefined
   let originalAuthToken: string | undefined
   let originalBaseUrl: string | undefined
   let originalModel: string | undefined
@@ -19,6 +20,7 @@ describe('ConversationService', () => {
   beforeEach(async () => {
     tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'cc-haha-conversation-service-'))
     originalConfigDir = process.env.CLAUDE_CONFIG_DIR
+    originalApiKey = process.env.ANTHROPIC_API_KEY
     originalAuthToken = process.env.ANTHROPIC_AUTH_TOKEN
     originalBaseUrl = process.env.ANTHROPIC_BASE_URL
     originalModel = process.env.ANTHROPIC_MODEL
@@ -28,6 +30,7 @@ describe('ConversationService', () => {
     originalDiagnosticsFile = process.env.CLAUDE_CODE_DIAGNOSTICS_FILE
 
     process.env.CLAUDE_CONFIG_DIR = tmpDir
+    process.env.ANTHROPIC_API_KEY = 'stale-parent-api-key'
     process.env.ANTHROPIC_AUTH_TOKEN = 'test-token'
     process.env.ANTHROPIC_BASE_URL = 'https://example.invalid/anthropic'
     process.env.ANTHROPIC_MODEL = 'test-model'
@@ -43,6 +46,9 @@ describe('ConversationService', () => {
     if (originalConfigDir === undefined) delete process.env.CLAUDE_CONFIG_DIR
     else process.env.CLAUDE_CONFIG_DIR = originalConfigDir
 
+    if (originalApiKey === undefined) delete process.env.ANTHROPIC_API_KEY
+    else process.env.ANTHROPIC_API_KEY = originalApiKey
+
     if (originalAuthToken === undefined) delete process.env.ANTHROPIC_AUTH_TOKEN
     else process.env.ANTHROPIC_AUTH_TOKEN = originalAuthToken
 
@@ -199,7 +205,7 @@ describe('ConversationService', () => {
     expect(env.ANTHROPIC_MODEL).toBe('new-provider-sonnet')
   })
 
-  test('buildChildEnv preserves provider capability overrides from presets', async () => {
+  test('buildChildEnv clears stale api key for bearer-token providers', async () => {
     const providerService = new ProviderService()
     const provider = await providerService.addProvider({
       presetId: 'jiekouai',
@@ -223,7 +229,7 @@ describe('ConversationService', () => {
 
     expect(env.ANTHROPIC_BASE_URL).toBe('https://api.jiekou.ai/anthropic')
     expect(env.ANTHROPIC_AUTH_TOKEN).toBe('provider-key')
-    expect(env.ANTHROPIC_API_KEY).toBeUndefined()
+    expect(env.ANTHROPIC_API_KEY).toBe('')
     expect(env.ANTHROPIC_MODEL).toBe('claude-sonnet-4-6')
     expect(env.ANTHROPIC_DEFAULT_SONNET_MODEL_SUPPORTED_CAPABILITIES).toBe('none')
   })
diff --git a/src/server/__tests__/providers-real.test.ts b/src/server/__tests__/providers-real.test.ts
index 152fba6d..9efa13a6 100644
--- a/src/server/__tests__/providers-real.test.ts
+++ b/src/server/__tests__/providers-real.test.ts
@@ -67,7 +67,7 @@ describe('Real Provider Configs', () => {
     const settings = await readCcHahaSettings()
     expect((settings.env as Record<string, string>).ANTHROPIC_BASE_URL).toBe('https://api.minimaxi.com/anthropic')
     expect((settings.env as Record<string, string>).ANTHROPIC_AUTH_TOKEN).toBe('sk-fake-test-key-for-testing-only')
-    expect((settings.env as Record<string, string>).ANTHROPIC_API_KEY).toBeUndefined()
+    expect((settings.env as Record<string, string>).ANTHROPIC_API_KEY).toBe('')
     expect((settings.env as Record<string, string>).ANTHROPIC_MODEL).toBe('MiniMax-M2.7-highspeed')
     expect(JSON.parse((settings.env as Record<string, string>).CLAUDE_CODE_MODEL_CONTEXT_WINDOWS)).toMatchObject({
       'MiniMax-M2.7': 204800,
@@ -116,7 +116,7 @@ describe('Real Provider Configs', () => {
     settings = await readCcHahaSettings()
     expect((settings.env as Record<string, string>).ANTHROPIC_BASE_URL).toBe('https://api.jiekou.ai/anthropic')
     expect((settings.env as Record<string, string>).ANTHROPIC_AUTH_TOKEN).toBe('sk-fake-test-key-for-testing-only')
-    expect((settings.env as Record<string, string>).ANTHROPIC_API_KEY).toBeUndefined()
+    expect((settings.env as Record<string, string>).ANTHROPIC_API_KEY).toBe('')
     expect((settings.env as Record<string, string>).ANTHROPIC_MODEL).toBe('claude-opus-4-7')
     expect((settings.env as Record<string, string>).CLAUDE_CODE_AUTO_COMPACT_WINDOW).toBeUndefined()
 
@@ -163,7 +163,7 @@ describe('Real Provider Configs', () => {
     // 验证新字段写入
     expect((settings.env as Record<string, string>).ANTHROPIC_BASE_URL).toBe('https://api.jiekou.ai/anthropic')
     expect((settings.env as Record<string, string>).ANTHROPIC_AUTH_TOKEN).toBe('sk_test')
-    expect((settings.env as Record<string, string>).ANTHROPIC_API_KEY).toBeUndefined()
+    expect((settings.env as Record<string, string>).ANTHROPIC_API_KEY).toBe('')
 
     // 验证已有字段保留
     expect(settings.customField).toBe('should_be_preserved')
@@ -252,7 +252,7 @@ describe('Real Provider Configs', () => {
     const haha = await readCcHahaSettings()
     expect((haha.env as Record<string, string>).ANTHROPIC_BASE_URL).toBe('https://api.minimaxi.com/anthropic')
     expect((haha.env as Record<string, string>).ANTHROPIC_AUTH_TOKEN).toBe('sk-haha-key')
-    expect((haha.env as Record<string, string>).ANTHROPIC_API_KEY).toBeUndefined()
+    expect((haha.env as Record<string, string>).ANTHROPIC_API_KEY).toBe('')
 
     console.log('✅ 原版 settings.json 完好无损，Haha 配置独立存储')
   })
diff --git a/src/server/__tests__/providers.test.ts b/src/server/__tests__/providers.test.ts
index 09367a0f..5fda2cda 100644
--- a/src/server/__tests__/providers.test.ts
+++ b/src/server/__tests__/providers.test.ts
@@ -305,7 +305,7 @@ describe('ProviderService', () => {
       const env = settings.env as Record<string, string>
       expect(env.ANTHROPIC_BASE_URL).toBe('https://new-api.example.com')
       expect(env.ANTHROPIC_AUTH_TOKEN).toBe('sk-new-key')
-      expect(env.ANTHROPIC_API_KEY).toBeUndefined()
+      expect(env.ANTHROPIC_API_KEY).toBe('')
       expect(env.ANTHROPIC_MODEL).toBe('model-main')
     })
 
@@ -445,7 +445,7 @@ describe('ProviderService', () => {
       const env = settings.env as Record<string, string>
       expect(env.ANTHROPIC_BASE_URL).toBe('https://second-api.example.com')
       expect(env.ANTHROPIC_AUTH_TOKEN).toBe('sk-second-key')
-      expect(env.ANTHROPIC_API_KEY).toBeUndefined()
+      expect(env.ANTHROPIC_API_KEY).toBe('')
       expect(env.ANTHROPIC_MODEL).toBe('model-main')
       expect(env.ANTHROPIC_DEFAULT_HAIKU_MODEL).toBe('model-haiku')
       expect(env.ANTHROPIC_DEFAULT_SONNET_MODEL).toBe('model-sonnet')
@@ -963,7 +963,7 @@ describe('Providers API', () => {
     const env = settings.env as Record<string, string>
     expect(env.ANTHROPIC_BASE_URL).toBe('https://second.example.com')
     expect(env.ANTHROPIC_AUTH_TOKEN).toBe('sk-second')
-    expect(env.ANTHROPIC_API_KEY).toBeUndefined()
+    expect(env.ANTHROPIC_API_KEY).toBe('')
     expect(env.ANTHROPIC_MODEL).toBe('model-main')
   })
 
diff --git a/src/server/services/providerService.ts b/src/server/services/providerService.ts
index 2d1891bc..82e1c4bc 100644
--- a/src/server/services/providerService.ts
+++ b/src/server/services/providerService.ts
@@ -143,7 +143,10 @@ function buildProviderAuthEnv(
     case 'api_key':
       return key ? { ANTHROPIC_API_KEY: key } : {}
     case 'auth_token':
-      return key ? { ANTHROPIC_AUTH_TOKEN: key } : {}
+      return {
+        ANTHROPIC_API_KEY: '',
+        ...(key ? { ANTHROPIC_AUTH_TOKEN: key } : {}),
+      }
     case 'auth_token_empty_api_key':
       return {
         ANTHROPIC_API_KEY: '',