fix: separate Anthropic output and context limits

Direct Anthropic connections reused the configured context window as max_tokens, which could impose an unintended output value or send a provider-invalid request. Anthropic connections now expose an independent per-response maximum output setting, defaulting to 32K for the protocol-required field, while OpenAI direct requests remain without an added output token cap and direct tool rounds remain unmetered.

Release note: Anthropic 直连模型现在可单独配置单次最大输出，不再复用上下文窗口；OpenAI 直连请求和工具调用轮次不增加额外配额。

src/main/agent/create-runtime.ts

@@ -96,7 +96,8 @@ function resolveContextCompression(
               'openai-images-generations'
             >,
             authentication: summaryProfile.authentication,
-            contextWindowTokens: summaryProfile.contextWindowTokens
+            contextWindowTokens: summaryProfile.contextWindowTokens,
+            maximumOutputTokens: summaryProfile.maximumOutputTokens
           }
         }
       : {})
@@ -120,6 +121,7 @@ export function createDefaultModelRuntime(
     protocol: settings.modelProtocol,
     authentication: settings.modelAuthentication,
     supportsImageInput: settings.supportsImageInput,
+    maximumOutputTokens: currentProfile?.maximumOutputTokens,
     defaultWorkspace: settings.workspacePath || defaultWorkspace,
     contextCompression: resolveContextCompression(
       settings,
@@ -141,6 +143,7 @@ export function createModelProfileRuntime(
     protocol: profile.protocol,
     authentication: profile.authentication,
     supportsImageInput: profile.supportsImageInput,
+    maximumOutputTokens: profile.maximumOutputTokens,
     imageGenerationQuality:
       profile.imageGenerationQuality ??
       defaultRuntimeSettings.imageGenerationQuality,

src/main/agent/model-runtime.test.ts

@@ -476,6 +476,7 @@ describe('ModelAgentRuntime', () => {
       model: 'sonnet-5',
       protocol: 'anthropic-messages',
       authentication: 'api-key',
+      maximumOutputTokens: 48_000,
       skillInstructions: '# 文档写作',
       fetcher
     })
@@ -500,11 +501,13 @@ describe('ModelAgentRuntime', () => {
 
     const body = JSON.parse(init?.body as string) as {
       model: string
+      max_tokens: number
       stream: boolean
       system: string
     }
     expect(body).toMatchObject({
       model: 'sonnet-5',
+      max_tokens: 48_000,
       stream: true
     })
     expect(body.system).toMatch(

src/main/agent/model-runtime.ts

@@ -8,6 +8,7 @@ import type {
   ModelProtocol,
   RuntimeConversationCompactInput
 } from '../../shared/contracts'
+import { defaultAnthropicMaximumOutputTokens } from '../../shared/contracts'
 import type { ResolvedMcpServer } from '../capabilities/capability-service'
 import type { BrowserToolService } from '../browser/browser-model-tools'
 import type { WorkspaceAccess } from '../workspace'
@@ -233,8 +234,10 @@ export type ModelRuntimeOptions = {
       protocol: Exclude<ModelProtocol, 'openai-images-generations'>
       authentication: ModelAuthentication
       contextWindowTokens?: number
+      maximumOutputTokens?: number
     }
   }
+  maximumOutputTokens?: number
 }
 
 function getErrorMessage(value: unknown): string | undefined {
@@ -1794,10 +1797,9 @@ export class ModelAgentRuntime implements AgentRuntime {
   }
 
   private get anthropicProtocolMaximumTokens(): number {
-    return Math.max(
-      this.options.contextCompression?.contextWindowTokens ??
-        minimumModelContextWindowTokens,
-      minimumModelContextWindowTokens
+    return (
+      this.options.maximumOutputTokens ??
+      defaultAnthropicMaximumOutputTokens
     )
   }
 
@@ -1877,7 +1879,8 @@ export class ModelAgentRuntime implements AgentRuntime {
         ModelProtocol,
         'openai-images-generations'
       >,
-      authentication: this.options.authentication
+      authentication: this.options.authentication,
+      maximumOutputTokens: this.options.maximumOutputTokens
     }
     const summaryRuntime = new ModelAgentRuntime({
       ...summaryModel,

src/main/agent/remote-model-gateway.ts

@@ -386,6 +386,7 @@ export function createResolvedModelProfileDigest(
       authentication: profile.authentication,
       supportsImageInput: profile.supportsImageInput === true,
       contextWindowTokens: profile.contextWindowTokens ?? null,
+      maximumOutputTokens: profile.maximumOutputTokens ?? null,
       imageGenerationQuality: profile.imageGenerationQuality ?? null
     })
   )

src/main/runtime-settings-store.test.ts

@@ -283,6 +283,7 @@ describe('RuntimeSettingsStore', () => {
             authentication: 'none',
             supportsImageInput: false,
             contextWindowTokens: 256_000,
+            maximumOutputTokens: 48_000,
             imageGenerationQuality: 'auto',
             apiKey: { action: 'keep' }
           }
@@ -302,7 +303,8 @@ describe('RuntimeSettingsStore', () => {
       modelProfiles: [
         {
           id: profileId,
-          contextWindowTokens: 256_000
+          contextWindowTokens: 256_000,
+          maximumOutputTokens: 48_000
         }
       ],
       contextCompression: {
@@ -316,7 +318,8 @@ describe('RuntimeSettingsStore', () => {
       modelProfiles: [
         {
           id: profileId,
-          contextWindowTokens: 256_000
+          contextWindowTokens: 256_000,
+          maximumOutputTokens: 48_000
         }
       ],
       contextCompression: {

src/main/runtime-settings-store.ts

@@ -170,6 +170,12 @@ const currentStoredModelProfileSchema = storedModelProfileSchema.extend({
     .int()
     .min(8_000)
     .max(10_000_000)
+    .optional(),
+  maximumOutputTokens: z
+    .number()
+    .int()
+    .min(1)
+    .max(10_000_000)
     .optional()
 })
 
@@ -434,6 +440,7 @@ export type ResolvedModelProfile = {
   authentication: RuntimeSettings['modelAuthentication']
   supportsImageInput?: boolean
   contextWindowTokens?: number
+  maximumOutputTokens?: number
   imageGenerationQuality?: RuntimeSettings['imageGenerationQuality']
   apiKey?: string
 }
@@ -1468,6 +1475,7 @@ export class RuntimeSettingsStore {
     authentication: RuntimeSettings['modelAuthentication']
     supportsImageInput: boolean
     contextWindowTokens?: number
+    maximumOutputTokens?: number
     imageGenerationQuality: RuntimeSettings['imageGenerationQuality']
     credentialSource: RuntimeSettings['credentialSource']
   } {
@@ -1529,6 +1537,7 @@ export class RuntimeSettingsStore {
         : profile.authentication,
       supportsImageInput: profile.supportsImageInput,
       contextWindowTokens: profile.contextWindowTokens,
+      maximumOutputTokens: profile.maximumOutputTokens,
       imageGenerationQuality: profile.imageGenerationQuality,
       credentialSource: credential.source
     }
@@ -1552,6 +1561,7 @@ export class RuntimeSettingsStore {
           authentication: effective.authentication,
           supportsImageInput: effective.supportsImageInput,
           contextWindowTokens: effective.contextWindowTokens,
+          maximumOutputTokens: effective.maximumOutputTokens,
           imageGenerationQuality: effective.imageGenerationQuality,
           apiKey: effective.apiKey
         }
@@ -1569,6 +1579,7 @@ export class RuntimeSettingsStore {
         authentication: profile.authentication,
         supportsImageInput: profile.supportsImageInput,
         contextWindowTokens: profile.contextWindowTokens,
+        maximumOutputTokens: profile.maximumOutputTokens,
         imageGenerationQuality: profile.imageGenerationQuality,
         apiKey: credential.activeApiKey
       }
@@ -1651,6 +1662,7 @@ export class RuntimeSettingsStore {
         authentication: resolved.authentication,
         supportsImageInput: resolved.supportsImageInput,
         contextWindowTokens: resolved.contextWindowTokens,
+        maximumOutputTokens: resolved.maximumOutputTokens,
         imageGenerationQuality:
           resolved.imageGenerationQuality ??
           defaultRuntimeSettings.imageGenerationQuality,
@@ -1672,6 +1684,7 @@ export class RuntimeSettingsStore {
         authentication: profile.authentication,
         supportsImageInput: profile.supportsImageInput,
         contextWindowTokens: profile.contextWindowTokens,
+        maximumOutputTokens: profile.maximumOutputTokens,
         imageGenerationQuality:
           profile.imageGenerationQuality ??
           defaultRuntimeSettings.imageGenerationQuality,
@@ -1966,6 +1979,7 @@ export class RuntimeSettingsStore {
               authentication: input.modelAuthentication,
               supportsImageInput: profile.supportsImageInput,
               contextWindowTokens: profile.contextWindowTokens,
+              maximumOutputTokens: profile.maximumOutputTokens,
               imageGenerationQuality: input.imageGenerationQuality,
               apiKey: input.apiKey
             }
@@ -1978,6 +1992,7 @@ export class RuntimeSettingsStore {
               authentication: profile.authentication,
               supportsImageInput: profile.supportsImageInput,
               contextWindowTokens: profile.contextWindowTokens,
+              maximumOutputTokens: profile.maximumOutputTokens,
               imageGenerationQuality: profile.imageGenerationQuality,
               apiKey: { action: 'keep' as const }
             }
@@ -2029,6 +2044,7 @@ export class RuntimeSettingsStore {
           authentication: profile.authentication,
           supportsImageInput: profile.supportsImageInput ?? false,
           contextWindowTokens: profile.contextWindowTokens,
+          maximumOutputTokens: profile.maximumOutputTokens,
           imageGenerationQuality: profile.imageGenerationQuality
         }
         if (