{"record":{"id":"f7e75abac93f0487","repo":"chenhg5/cc-connect","slug":"codex-app-server-turn-start-w","errorCode":null,"errorMessage":"codex app-server turn/start: %w","messagePattern":"codex app-server turn/start: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"agent/codex/appserver_session.go","lineNumber":500,"sourceCode":"\t}\n\n\tparams := map[string]any{\n\t\t\"threadId\": threadID,\n\t\t\"input\":    input,\n\t}\n\tif model := s.GetModel(); model != \"\" {\n\t\tparams[\"model\"] = model\n\t}\n\tif effort := s.GetReasoningEffort(); effort != \"\" {\n\t\tparams[\"effort\"] = effort\n\t}\n\tif approval, _ := appServerModeSettings(s.mode); approval != \"\" {\n\t\tparams[\"approvalPolicy\"] = approval\n\t}\n\n\tvar resp turnStartResponse\n\tif err := s.request(\"turn/start\", params, &resp); err != nil {\n\t\treturn fmt.Errorf(\"codex app-server turn/start: %w\", err)\n\t}\n\tif resp.Turn.ID == \"\" {\n\t\treturn fmt.Errorf(\"codex app-server turn/start returned empty turn id\")\n\t}\n\n\ts.stateMu.Lock()\n\ts.currentTurn = resp.Turn.ID\n\ts.pendingMsgs = s.pendingMsgs[:0]\n\ts.stateMu.Unlock()\n\n\treturn nil\n}\n\nfunc (s *appServerSession) stageImages(prompt string, images []core.ImageAttachment) (string, []string, error) {\n\tif len(images) == 0 {\n\t\treturn prompt, nil, nil\n\t}\n","sourceCodeStart":482,"sourceCodeEnd":518,"githubUrl":"https://github.com/chenhg5/cc-connect/blob/4000b2338aa6e850c99df54f8b0ed6ed7460b401/agent/codex/appserver_session.go#L482-L518","documentation":"The turn/start JSON-RPC request to the codex app-server returned an error; the underlying cause (timeout, process death, error response, closed pipe) is wrapped in %w. This is the transport/request-level failure, as opposed to a successful response with a bad payload.","triggerScenarios":"s.request(\"turn/start\", params, &resp) fails because the app-server process exited, the pipe closed, the request timed out waiting for a response, or the server replied with a JSON-RPC error (e.g. invalid thread, rejected turn).","commonSituations":"codex process crashed or was killed mid-session; session used after the read loop already rejected pending requests; codex rejected the turn due to an invalid thread id or auth/quota problem; slow app-server exceeding the request timeout.","solutions":["Check the wrapped cause (errors.Unwrap / %v) to see if the process died, timed out, or returned a server error","Verify the codex process is still alive (s.alive) and restart the session if it exited","Inspect codex-side logs for the JSON-RPC error (auth, quota, invalid thread)","Increase the request timeout if the app-server is merely slow"],"exampleFix":"// before\nif err := s.Send(ctx, prompt, nil); err != nil {\n    return fmt.Errorf(\"send failed: %v\", err) // hides cause\n}\n// after\nif err := s.Send(ctx, prompt, nil); err != nil {\n    var alive atomic.Bool\n    if !sess.IsAlive() { sess, err = agent.StartSession(ctx, opts) } // restart dead app-server\n    return fmt.Errorf(\"send failed: %w\", err)\n}","handlingStrategy":"retry","validationCode":"if !sess.IsAlive() {\n    sess, err = agent.StartSession(ctx, opts)\n    if err != nil { return err }\n}","typeGuard":null,"tryCatchPattern":"if err := sess.Send(ctx, prompt, nil); err != nil {\n    if !sess.IsAlive() {\n        // process died: restart, then retry once\n        sess, rerr := agent.StartSession(ctx, opts)\n        if rerr == nil { return sess.Send(ctx, prompt, nil) }\n    }\n    return fmt.Errorf(\"turn/start failed: %w\", err)\n}","preventionTips":["Monitor IsAlive() and restart sessions proactively","Keep the codex CLI up to date to avoid protocol-level rejections","Log errors with %w so the underlying transport cause is visible","Watch codex auth/quota status which commonly causes server-side turn rejections"],"tags":["codex","app-server","json-rpc","process"],"backgroundTag":"api-request-failed","analyzedSha":"4000b2338aa6e850c99df54f8b0ed6ed7460b401","analyzedAt":"2026-09-06T11:45:09.575Z","contentChangedAt":"2026-09-06T11:45:09.575Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}