Codex 会话经 GitHub Copilot 供应商首条消息即失败：Chat Completions bridge 不支持 Responses 结构化 content（unsupported_feature: input[0].content）

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
48/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
typescript
Domain
backend-api-design

Research direction

Trace the Codex request through Cindy's Responses-to-Chat Completions bridge and locate the handling of input[0].content; the issue names no source files or tests. Reproduce with a plain text message using Codex and a Chat Completions-only provider, then inspect how structured text parts and unsupported content are handled. Done means text input works or the unsupported provider and engine combination is clearly rejected before sending a message.

Written by the indexing model from the issue text.

Description

feature

现象

新建 Codex 会话，发送最普通的文本消息（"Hello"），回复立即失败，界面提示「回复未完成」。任何消息内容都会同样失败，且客户端不重试。

错误信息

{"error":{"type":"invalid_request_error","code":"unsupported_feature","message":"Responses feature is not supported by the Chat Completions bridge: input[0].content"}}

环境 / 触发组合

  • Cindy 运行于 Ubuntu Linux（6.8.0-147-generic），桌面客户端
  • 执行引擎：Codex（原生使用 OpenAI Responses API，input 为结构化 content 块）
  • 模型：gpt-5.6-luna
  • 供应商：GitHub Copilot（providerId: github-copilot-7015bb69，仅有 Chat Completions 接口）
  • 路由：Cindy 网关桥接（modelProvider: cindy_gateway），effort: medium，fastMode: off
  • 会话：303bc43d-e0fc-4191-8ccf-8b11f44b6301（本地日志：~/.config/Cindy/logs/sessions/.../2026-11-11.ndjson，2026-11-11）

日志时间线

  1. startSession（Codex，model=gpt-5.6-luna，provider=github-copilot）
  2. thread/start ok（threadId: 01a1c99c-9529-79b3-a120-d6d70a7935c8）
  3. 约 55ms 后 codex turn error：上述 unsupported_feature 错误，willRetry: false
    • turnId: 01a1c99c-9621-7040-84cb-12931c5a4409

分析

请求尚未到达模型即被「Responses → Chat Completions」桥接层拒绝：桥接层不支持 input[0].content 这种结构化内容块（Codex 即使正文是纯文本，输入也是 content parts 格式）。因此 Codex 引擎 + 仅有 Chat Completions 接口的供应商 这一组合在当前版本下完全不可用。

期望

  • 桥接层支持结构化 content 块的降级转换（纯文本 parts 拼接为字符串；图片等确实不支持的内容给出明确能力提示），或
  • 在选择模型/供应商组合时提前校验并阻止该组合，而不是首条消息静默失败。

复现步骤

  1. 添加 GitHub Copilot 作为 Codex 的模型供应商
  2. 新建 Codex 会话，模型选 gpt-5.6-luna
  3. 发送任意文本消息 → 必现
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