feat: 增强聊天代理流行为，优化错误处理和工具调用逻辑

src/server/routes/proxy/chat.stream.test.ts

@@ -1096,6 +1096,105 @@ describe('chat proxy stream behavior', () => {
     expect(targetUrl).toContain('/v1/messages');
   });
 
+  it('prefers /v1/messages on openai platform for claude-family models on /v1/chat/completions', async () => {
+    fetchModelPricingCatalogMock.mockResolvedValue({
+      models: [
+        {
+          modelName: 'claude-opus-4-6',
+          supportedEndpointTypes: ['/v1/chat/completions', 'openai'],
+        },
+      ],
+      groupRatio: {},
+    });
+
+    selectChannelMock.mockReturnValue({
+      channel: { id: 11, routeId: 22 },
+      site: { name: 'openai-site', url: 'https://api.openai.com', platform: 'openai' },
+      account: { id: 33, username: 'demo-user' },
+      tokenName: 'default',
+      tokenValue: 'sk-openai',
+      actualModel: 'claude-opus-4-6',
+    });
+
+    fetchMock.mockResolvedValue(new Response(JSON.stringify({
+      id: 'msg_openai_platform_claude',
+      type: 'message',
+      model: 'claude-opus-4-6',
+      content: [{ type: 'text', text: 'messages endpoint selected' }],
+      stop_reason: 'end_turn',
+      usage: { input_tokens: 6, output_tokens: 2, total_tokens: 8 },
+    }), {
+      status: 200,
+      headers: { 'content-type': 'application/json' },
+    }));
+
+    const response = await app.inject({
+      method: 'POST',
+      url: '/v1/chat/completions',
+      payload: {
+        model: 'claude-opus-4-6',
+        stream: false,
+        messages: [{ role: 'user', content: 'hello' }],
+      },
+    });
+
+    expect(response.statusCode).toBe(200);
+    expect(fetchMock).toHaveBeenCalledTimes(1);
+    const [targetUrl] = fetchMock.mock.calls[0] as [string, any];
+    expect(targetUrl).toContain('/v1/messages');
+  });
+
+  it('falls back from /v1/messages to /v1/chat/completions on openai platform when messages endpoint is unavailable', async () => {
+    selectChannelMock.mockReturnValue({
+      channel: { id: 11, routeId: 22 },
+      site: { name: 'openai-site', url: 'https://api.openai.com', platform: 'openai' },
+      account: { id: 33, username: 'demo-user' },
+      tokenName: 'default',
+      tokenValue: 'sk-openai',
+      actualModel: 'claude-opus-4-6',
+    });
+
+    fetchMock
+      .mockResolvedValueOnce(new Response(JSON.stringify({
+        error: { message: 'Not Found', type: 'not_found_error' },
+      }), {
+        status: 404,
+        headers: { 'content-type': 'application/json' },
+      }))
+      .mockResolvedValueOnce(new Response(JSON.stringify({
+        id: 'chatcmpl_openai_fallback_chat',
+        object: 'chat.completion',
+        created: 1_706_000_777,
+        model: 'claude-opus-4-6',
+        choices: [{
+          index: 0,
+          message: { role: 'assistant', content: 'fallback to chat completed' },
+          finish_reason: 'stop',
+        }],
+        usage: { prompt_tokens: 5, completion_tokens: 3, total_tokens: 8 },
+      }), {
+        status: 200,
+        headers: { 'content-type': 'application/json' },
+      }));
+
+    const response = await app.inject({
+      method: 'POST',
+      url: '/v1/chat/completions',
+      payload: {
+        model: 'claude-opus-4-6',
+        stream: false,
+        messages: [{ role: 'user', content: 'hello' }],
+      },
+    });
+
+    expect(response.statusCode).toBe(200);
+    expect(fetchMock).toHaveBeenCalledTimes(2);
+    const [firstUrl] = fetchMock.mock.calls[0] as [string, any];
+    const [secondUrl] = fetchMock.mock.calls[1] as [string, any];
+    expect(firstUrl).toContain('/v1/messages');
+    expect(secondUrl).toContain('/v1/chat/completions');
+  });
+
   it('forces openai platform to use /v1/chat/completions for claude downstream requests', async () => {
     selectChannelMock.mockReturnValue({
       channel: { id: 11, routeId: 22 },
@@ -1359,6 +1458,71 @@ describe('chat proxy stream behavior', () => {
     expect(forwardedBody.tool_choice).toEqual({ type: 'tool', name: 'Glob' });
   });
 
+  it('groups consecutive tool messages into one anthropic user turn when routing /v1/chat/completions to /v1/messages', async () => {
+    selectChannelMock.mockReturnValue({
+      channel: { id: 11, routeId: 22 },
+      site: { name: 'claude-site', url: 'https://api.anthropic.com', platform: 'claude' },
+      account: { id: 33, username: 'demo-user' },
+      tokenName: 'default',
+      tokenValue: 'sk-claude',
+      actualModel: 'claude-sonnet-4-5-20250929',
+    });
+
+    fetchMock.mockResolvedValue(new Response(JSON.stringify({
+      id: 'msg_claude_grouped_tool_results',
+      type: 'message',
+      model: 'claude-sonnet-4-5-20250929',
+      content: [{ type: 'text', text: 'ok' }],
+      stop_reason: 'end_turn',
+    }), {
+      status: 200,
+      headers: { 'content-type': 'application/json' },
+    }));
+
+    const response = await app.inject({
+      method: 'POST',
+      url: '/v1/chat/completions',
+      payload: {
+        model: 'claude-sonnet-4-5-20250929',
+        stream: false,
+        messages: [
+          {
+            role: 'assistant',
+            tool_calls: [
+              {
+                id: 'call_one',
+                type: 'function',
+                function: { name: 'Glob', arguments: '{"pattern":"README*"}' },
+              },
+              {
+                id: 'call_two',
+                type: 'function',
+                function: { name: 'Read', arguments: '{"file":"README.md"}' },
+              },
+            ],
+          },
+          { role: 'tool', tool_call_id: 'call_one', content: '{"matches":["README.md"]}' },
+          { role: 'tool', tool_call_id: 'call_two', content: '{"content":"hello"}' },
+          { role: 'user', content: 'continue' },
+        ],
+      },
+    });
+
+    expect(response.statusCode).toBe(200);
+
+    const [_targetUrl, options] = fetchMock.mock.calls[0] as [string, any];
+    const forwardedBody = JSON.parse(options.body);
+    expect(Array.isArray(forwardedBody.messages)).toBe(true);
+
+    const userMessages = forwardedBody.messages.filter((item: any) => item?.role === 'user');
+    expect(userMessages.length).toBe(1);
+    expect(Array.isArray(userMessages[0]?.content)).toBe(true);
+    expect(userMessages[0].content.filter((part: any) => part?.type === 'tool_result').length).toBe(2);
+    expect(userMessages[0].content.some((part: any) => part?.type === 'tool_result' && part?.tool_use_id === 'call_one')).toBe(true);
+    expect(userMessages[0].content.some((part: any) => part?.type === 'tool_result' && part?.tool_use_id === 'call_two')).toBe(true);
+    expect(userMessages[0].content.some((part: any) => part?.type === 'text' && part?.text === 'continue')).toBe(true);
+  });
+
   it('converts /v1/responses function_call SSE to OpenAI tool_calls on /v1/chat/completions', async () => {
     fetchModelPricingCatalogMock.mockResolvedValue({
       models: [
@@ -1493,6 +1657,47 @@ describe('chat proxy stream behavior', () => {
     expect(matches.length).toBe(1);
   });
 
+  it('emits finish_reason error when /v1/chat/completions receives response.failed from /v1/responses upstream', async () => {
+    fetchModelPricingCatalogMock.mockResolvedValue({
+      models: [
+        {
+          modelName: 'upstream-gpt',
+          supportedEndpointTypes: ['/v1/responses'],
+        },
+      ],
+      groupRatio: {},
+    });
+
+    const encoder = new TextEncoder();
+    const upstreamBody = new ReadableStream<Uint8Array>({
+      start(controller) {
+        controller.enqueue(encoder.encode('event: response.created\ndata: {"type":"response.created","response":{"id":"resp_fail_1","model":"upstream-gpt","created_at":1706000000,"status":"in_progress","output":[]}}\n\n'));
+        controller.enqueue(encoder.encode('event: response.failed\ndata: {"type":"response.failed","response":{"id":"resp_fail_1","model":"upstream-gpt","status":"failed","error":{"message":"tool execution failed"}}}\n\n'));
+        controller.enqueue(encoder.encode('data: [DONE]\n\n'));
+        controller.close();
+      },
+    });
+
+    fetchMock.mockResolvedValue(new Response(upstreamBody, {
+      status: 200,
+      headers: { 'content-type': 'text/event-stream; charset=utf-8' },
+    }));
+
+    const response = await app.inject({
+      method: 'POST',
+      url: '/v1/chat/completions',
+      payload: {
+        model: 'claude-haiku-4-5-20251001',
+        stream: true,
+        messages: [{ role: 'user', content: 'find readme' }],
+      },
+    });
+
+    expect(response.statusCode).toBe(200);
+    expect(response.body).toContain('"finish_reason":"error"');
+    expect(response.body).toContain('[DONE]');
+  });
+
   it('preserves non-stream function_call output when /v1/chat/completions falls back to /v1/responses', async () => {
     fetchModelPricingCatalogMock.mockResolvedValue({
       models: [
@@ -1569,7 +1774,7 @@ describe('chat proxy stream behavior', () => {
       method: 'POST',
       url: '/v1/chat/completions',
       payload: {
-        model: 'claude-haiku-4-5-20251001',
+        model: 'gpt-4o-mini',
         stream: false,
         tools: [{
           type: 'function',

src/server/routes/proxy/chatFormats.ts

@@ -161,6 +161,10 @@ export function normalizeStopReason(raw: unknown): string | null {
   const value = typeof raw === 'string' ? raw.trim().toLowerCase() : '';
   if (!value) return null;
 
+  if (value === 'failed' || value === 'error') {
+    return 'error';
+  }
+
   if (
     value === 'end_turn'
     || value === 'stop'
@@ -803,6 +807,19 @@ export function normalizeUpstreamStreamEvent(
     };
   }
 
+  if (type === 'response.failed' || type === 'response.incomplete' || type === 'error') {
+    const responsePayload = isRecord((payload as any).response) ? (payload as any).response : null;
+    const finishReason = normalizeStopReason(
+      (responsePayload as any)?.status
+      ?? (payload as any).status
+      ?? (payload as any).type,
+    ) || 'error';
+    return {
+      finishReason,
+      done: true,
+    };
+  }
+
   if (type === 'response.output_item.added' && isRecord((payload as any).item)) {
     const item = (payload as any).item as Record<string, unknown>;
     if (item.type === 'function_call') {

src/server/routes/proxy/upstreamEndpoint.test.ts

@@ -6,7 +6,7 @@ vi.mock('../../services/modelPricingService.js', () => ({
   fetchModelPricingCatalog: (arg: unknown) => fetchModelPricingCatalogMock(arg),
 }));
 
-import { resolveUpstreamEndpointCandidates } from './upstreamEndpoint.js';
+import { isEndpointDowngradeError, resolveUpstreamEndpointCandidates } from './upstreamEndpoint.js';
 
 const baseContext = {
   site: {
@@ -104,7 +104,7 @@ describe('resolveUpstreamEndpointCandidates', () => {
       'gpt-5.3',
       'openai',
     );
-    expect(openaiOrder).toEqual(['chat', 'responses']);
+    expect(openaiOrder).toEqual(['chat', 'responses', 'messages']);
 
     const openaiResponsesOrder = await resolveUpstreamEndpointCandidates(
       {
@@ -114,7 +114,17 @@ describe('resolveUpstreamEndpointCandidates', () => {
       'gpt-5.3',
       'responses',
     );
-    expect(openaiResponsesOrder).toEqual(['responses', 'chat']);
+    expect(openaiResponsesOrder).toEqual(['responses', 'chat', 'messages']);
+
+    const openaiClaudeOrder = await resolveUpstreamEndpointCandidates(
+      {
+        ...baseContext,
+        site: { ...baseContext.site, platform: 'openai' },
+      },
+      'claude-opus-4-6',
+      'openai',
+    );
+    expect(openaiClaudeOrder).toEqual(['messages', 'chat', 'responses']);
 
     const claudeOrder = await resolveUpstreamEndpointCandidates(
       {
@@ -127,6 +137,29 @@ describe('resolveUpstreamEndpointCandidates', () => {
     expect(claudeOrder).toEqual(['messages']);
   });
 
+  it('keeps claude models messages-first even when openai platform catalog prefers chat', async () => {
+    fetchModelPricingCatalogMock.mockResolvedValue({
+      models: [
+        {
+          modelName: 'claude-opus-4-6',
+          supportedEndpointTypes: ['/v1/chat/completions', 'openai'],
+        },
+      ],
+      groupRatio: {},
+    });
+
+    const order = await resolveUpstreamEndpointCandidates(
+      {
+        ...baseContext,
+        site: { ...baseContext.site, platform: 'openai' },
+      },
+      'claude-opus-4-6',
+      'openai',
+    );
+
+    expect(order).toEqual(['messages', 'chat', 'responses']);
+  });
+
   it('keeps anyrouter messages-first special case', async () => {
     const openaiOrder = await resolveUpstreamEndpointCandidates(
       {
@@ -148,4 +181,10 @@ describe('resolveUpstreamEndpointCandidates', () => {
     );
     expect(responsesOrder).toEqual(['responses', 'messages', 'chat']);
   });
+
+  it('treats endpoint-not-found responses as downgrade candidates', () => {
+    expect(isEndpointDowngradeError(404, '{"error":{"message":"Not Found","type":"not_found_error"}}')).toBe(true);
+    expect(isEndpointDowngradeError(405, '{"error":{"message":"Method Not Allowed"}}')).toBe(true);
+    expect(isEndpointDowngradeError(400, '{"error":{"message":"unsupported endpoint","type":"invalid_request_error"}}')).toBe(true);
+  });
 });

src/server/routes/proxy/upstreamEndpoint.ts

@@ -394,7 +394,63 @@ function convertOpenAiBodyToMessagesBody(
     content: string | Array<Record<string, unknown>>;
   }> = [];
 
-  for (const item of rawMessages) {
+  const appendAssistantMessage = (item: Record<string, unknown>) => {
+    const role = asTrimmedString(item.role).toLowerCase() || 'assistant';
+    if (role !== 'assistant') return;
+
+    const contentBlocks: Array<Record<string, unknown>> = [];
+
+    const textContent = normalizeContentText(item.content).trim();
+    if (textContent) {
+      contentBlocks.push({
+        type: 'text',
+        text: textContent,
+      });
+    }
+
+    const rawToolCalls = Array.isArray(item.tool_calls) ? item.tool_calls : [];
+    for (let index = 0; index < rawToolCalls.length; index += 1) {
+      const toolCall = rawToolCalls[index];
+      if (!isRecord(toolCall)) continue;
+      const functionPart = isRecord(toolCall.function) ? toolCall.function : {};
+
+      const id = asTrimmedString(toolCall.id) || `toolu_${Date.now()}_${index}`;
+      const name = (
+        asTrimmedString(functionPart.name)
+        || asTrimmedString(toolCall.name)
+        || `tool_${index}`
+      );
+      const input = normalizeAnthropicToolInput(functionPart.arguments ?? toolCall.arguments);
+
+      contentBlocks.push({
+        type: 'tool_use',
+        id,
+        name,
+        input,
+      });
+    }
+
+    if (contentBlocks.length <= 0) return;
+
+    if (contentBlocks.length === 1 && contentBlocks[0].type === 'text') {
+      const singleText = asTrimmedString(contentBlocks[0].text);
+      if (singleText) {
+        messages.push({
+          role: 'assistant',
+          content: singleText,
+        });
+      }
+      return;
+    }
+
+    messages.push({
+      role: 'assistant',
+      content: contentBlocks,
+    });
+  };
+
+  for (let messageIndex = 0; messageIndex < rawMessages.length; messageIndex += 1) {
+    const item = rawMessages[messageIndex];
     if (!isRecord(item)) continue;
     const role = asTrimmedString(item.role).toLowerCase() || 'user';
 
@@ -406,73 +462,59 @@ function convertOpenAiBodyToMessagesBody(
     }
 
     if (role === 'tool') {
-      const toolUseId = asTrimmedString(item.tool_call_id) || asTrimmedString(item.id);
+      const toolResultBlocks: Array<Record<string, unknown>> = [];
-      if (!toolUseId) continue;
+      let cursor = messageIndex;
+      while (cursor < rawMessages.length) {
+        const toolCandidate = rawMessages[cursor];
+        if (!isRecord(toolCandidate)) break;
+        const toolRole = asTrimmedString(toolCandidate.role).toLowerCase();
+        if (toolRole !== 'tool') break;
 
-      const toolResultContent = normalizeToolMessageContent(item.content).trim();
+        const toolUseId = (
-      if (!toolResultContent) continue;
+          asTrimmedString(toolCandidate.tool_call_id)
+          || asTrimmedString(toolCandidate.id)
+        );
+        const toolResultContent = normalizeToolMessageContent(toolCandidate.content).trim();
+        if (toolUseId && toolResultContent) {
+          toolResultBlocks.push({
+            type: 'tool_result',
+            tool_use_id: toolUseId,
+            content: toolResultContent,
+          });
+        }
+        cursor += 1;
+      }
 
-      messages.push({
+      if (toolResultBlocks.length > 0 && cursor < rawMessages.length) {
-        role: 'user',
+        const nextItem = rawMessages[cursor];
-        content: [{
+        if (isRecord(nextItem)) {
-          type: 'tool_result',
+          const nextRole = asTrimmedString(nextItem.role).toLowerCase();
-          tool_use_id: toolUseId,
+          if (nextRole === 'user') {
-          content: toolResultContent,
+            const userText = normalizeContentText(nextItem.content).trim();
-        }],
+            if (userText) {
-      });
+              toolResultBlocks.push({
+                type: 'text',
+                text: userText,
+              });
+            }
+            cursor += 1;
+          }
+        }
+      }
+
+      if (toolResultBlocks.length > 0) {
+        messages.push({
+          role: 'user',
+          content: toolResultBlocks,
+        });
+      }
+
+      messageIndex = cursor - 1;
       continue;
     }
 
     if (role === 'assistant') {
-      const contentBlocks: Array<Record<string, unknown>> = [];
+      appendAssistantMessage(item);
-
-      const textContent = normalizeContentText(item.content).trim();
-      if (textContent) {
-        contentBlocks.push({
-          type: 'text',
-          text: textContent,
-        });
-      }
-
-      const rawToolCalls = Array.isArray(item.tool_calls) ? item.tool_calls : [];
-      for (let index = 0; index < rawToolCalls.length; index += 1) {
-        const toolCall = rawToolCalls[index];
-        if (!isRecord(toolCall)) continue;
-        const functionPart = isRecord(toolCall.function) ? toolCall.function : {};
-
-        const id = asTrimmedString(toolCall.id) || `toolu_${Date.now()}_${index}`;
-        const name = (
-          asTrimmedString(functionPart.name)
-          || asTrimmedString(toolCall.name)
-          || `tool_${index}`
-        );
-        const input = normalizeAnthropicToolInput(functionPart.arguments ?? toolCall.arguments);
-
-        contentBlocks.push({
-          type: 'tool_use',
-          id,
-          name,
-          input,
-        });
-      }
-
-      if (contentBlocks.length <= 0) continue;
-
-      if (contentBlocks.length === 1 && contentBlocks[0].type === 'text') {
-        const singleText = asTrimmedString(contentBlocks[0].text);
-        if (singleText) {
-          messages.push({
-            role: 'assistant',
-            content: singleText,
-          });
-        }
-        continue;
-      }
-
-      messages.push({
-        role: 'assistant',
-        content: contentBlocks,
-      });
       continue;
     }
 
@@ -698,9 +740,14 @@ function preferredEndpointOrder(
   }
 
   if (platform === 'openai') {
+    if (preferMessagesForClaudeModel && downstreamFormat !== 'responses') {
+      // Some OpenAI-compatible gateways expose Claude natively via /v1/messages.
+      // Keep chat/responses as fallbacks when messages is unavailable.
+      return ['messages', 'chat', 'responses'];
+    }
     return downstreamFormat === 'responses'
-      ? ['responses', 'chat']
+      ? ['responses', 'chat', 'messages']
-      : ['chat', 'responses'];
+      : ['chat', 'responses', 'messages'];
   }
 
   if (platform === 'claude') {
@@ -781,6 +828,14 @@ export async function resolveUpstreamEndpointCandidates(
     );
     if (!matched) return preferred;
 
+    const shouldIgnoreCatalogOrderingForClaudeMessages = (
+      preferMessagesForClaudeModel
+      && downstreamFormat !== 'responses'
+    );
+    if (shouldIgnoreCatalogOrderingForClaudeMessages) {
+      return preferred;
+    }
+
     const supportedRaw = Array.isArray(matched.supportedEndpointTypes) ? matched.supportedEndpointTypes : [];
     const normalizedSupportedRaw = supportedRaw
       .map((item) => asTrimmedString(item).toLowerCase())
@@ -864,6 +919,7 @@ export function buildUpstreamEndpointRequest(input: {
     }
 
     if (sitePlatform === 'openai') {
+      if (endpoint === 'messages') return '/v1/messages';
       if (endpoint === 'responses') return '/v1/responses';
       return '/v1/chat/completions';
     }
@@ -961,6 +1017,7 @@ export function buildUpstreamEndpointRequest(input: {
 export function isEndpointDowngradeError(status: number, upstreamErrorText?: string | null): boolean {
   if (status < 400) return false;
   const text = (upstreamErrorText || '').toLowerCase();
+  if (status === 404 || status === 405 || status === 501) return true;
   if (!text) return false;
 
   let parsedCode = '';
@@ -982,12 +1039,34 @@ export function isEndpointDowngradeError(status: number, upstreamErrorText?: str
 
   return (
     text.includes('convert_request_failed')
+    || text.includes('not found')
+    || text.includes('unknown endpoint')
+    || text.includes('unsupported endpoint')
+    || text.includes('unsupported path')
+    || text.includes('unrecognized request url')
+    || text.includes('no route matched')
+    || text.includes('does not exist')
+    || (status === 400 && text.includes('unsupported'))
     || text.includes('not implemented')
     || text.includes('api not implemented')
     || text.includes('unsupported legacy protocol')
     || parsedCode === 'convert_request_failed'
+    || parsedCode === 'not_found'
+    || parsedCode === 'endpoint_not_found'
+    || parsedCode === 'unknown_endpoint'
+    || parsedCode === 'unsupported_endpoint'
     || parsedCode === 'bad_response_status_code'
+    || parsedType === 'not_found_error'
+    || parsedType === 'invalid_request_error'
+    || parsedType === 'unsupported_endpoint'
+    || parsedType === 'unsupported_path'
     || parsedType === 'bad_response_status_code'
+    || parsedMessage.includes('unknown endpoint')
+    || parsedMessage.includes('unsupported endpoint')
+    || parsedMessage.includes('unsupported path')
+    || parsedMessage.includes('unrecognized request url')
+    || parsedMessage.includes('no route matched')
+    || parsedMessage.includes('does not exist')
     || parsedMessage.includes('bad_response_status_code')
   );
 }