{"record":{"id":"f4b6bb5e8100f677","repo":"chenhg5/cc-connect","slug":"s-f4b6bb","errorCode":null,"errorMessage":"%s","messagePattern":"%s","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"agent/copilot/session.go","lineNumber":258,"sourceCode":"\tif _, err := rand.Read(b[:]); err != nil {\n\t\treturn fmt.Sprintf(\"cc-connect-%d\", time.Now().UnixNano())\n\t}\n\tb[6] = (b[6] & 0x0f) | 0x40\n\tb[8] = (b[8] & 0x3f) | 0x80\n\treturn fmt.Sprintf(\"%08x-%04x-%04x-%04x-%012x\", b[0:4], b[4:6], b[6:8], b[8:10], b[10:16])\n}\n\nfunc (cs *copilotSession) readLoop(stderrBuf *bytes.Buffer) {\n\tdefer func() {\n\t\tcs.alive.Store(false)\n\t\tcs.rpc.cancelAll(fmt.Errorf(\"process exited\"))\n\n\t\t// Wait for process exit\n\t\tif err := cs.cmd.Wait(); err != nil {\n\t\t\tstderrMsg := strings.TrimSpace(stderrBuf.String())\n\t\t\tif stderrMsg != \"\" {\n\t\t\t\tslog.Error(\"copilotSession: process failed\", \"error\", err, \"stderr\", stderrMsg)\n\t\t\t\tevt := core.Event{Type: core.EventError, Error: fmt.Errorf(\"%s\", stderrMsg)}\n\t\t\t\tselect {\n\t\t\t\tcase cs.events <- evt:\n\t\t\t\tcase <-cs.ctx.Done():\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tclose(cs.events)\n\t\tclose(cs.done)\n\t}()\n\n\tfor {\n\t\tbody, err := cs.reader.readMessage()\n\t\tif err != nil {\n\t\t\tif cs.ctx.Err() != nil {\n\t\t\t\treturn\n\t\t\t}\n\t\t\tslog.Error(\"copilotSession: read error\", \"error\", err)\n\t\t\treturn","sourceCodeStart":240,"sourceCodeEnd":276,"githubUrl":"https://github.com/chenhg5/cc-connect/blob/4000b2338aa6e850c99df54f8b0ed6ed7460b401/agent/copilot/session.go#L240-L276","documentation":"When the Copilot CLI process exits with a non-zero status and its stderr contains output, readLoop emits a core.EventError whose Error is the trimmed stderr text verbatim. This is not a fixed message: it surfaces whatever the CLI printed to stderr, so the developer sees the child process's actual failure output as an event on the session's event stream.","triggerScenarios":"readLoop -> cs.cmd.Wait() returns err != nil and stderrBuf is non-empty -> core.Event{Type: core.EventError, Error: fmt.Errorf(\"%s\", stderrMsg)} is pushed to cs.events. Any CLI startup/runtime failure that writes to stderr triggers it (bad flag, auth failure, panic, missing binary).","commonSituations":"Wrong CLI path or args configured in config.toml so the CLI exits with usage errors; expired GitHub/Copilot auth; CLI panics on an unsupported request; host lacks a dependency the CLI needs (e.g. node runtime).","solutions":["Read the event's message — it is the CLI's own stderr and usually states the exact problem (unknown flag, auth required, etc.).","Re-authenticate the Copilot CLI if stderr mentions auth/token/401.","Correct the command/args configured for the copilot agent in config.toml to match the installed CLI version.","Run the CLI binary manually with the same args to reproduce and debug the failure outside cc-connect.","Upgrade cc-connect and/or the CLI if the stderr shows protocol or flag incompatibility."],"exampleFix":"// before: stderr event: \"unknown flag: --foobar\"\n[[agents]]\nname = \"copilot\"\nargs = [\"--foobar\"]\n// after: use flags supported by the installed CLI\nargs = [\"--model\", \"gpt-4o\"]","handlingStrategy":"try-catch","validationCode":"// capture CLI stderr early in a dry run\nout, err := exec.Command(cliPath, args...).CombinedOutput()\nif err != nil {\n    return fmt.Errorf(\"copilot CLI fails with args %v: %v: %s\", args, err, out)\n}","typeGuard":null,"tryCatchPattern":"for evt := range session.Events() {\n    if evt.Type == core.EventError {\n        // evt.Error text is the CLI's stderr — surface it to the user/log\n        slog.Error(\"copilot CLI stderr\", \"stderr\", evt.Error.Error())\n    }\n}","preventionTips":["Test the exact CLI binary+args from config.toml manually before deploying","Keep the CLI authenticated to avoid auth-related stderr failures","Treat EventError text as actionable CLI diagnostics, not noise","Alert on non-zero CLI exits so stderr failures are noticed"],"tags":["stderr","process-crash","event-stream","diagnostics"],"backgroundTag":"upstream-api-error","analyzedSha":"4000b2338aa6e850c99df54f8b0ed6ed7460b401","analyzedAt":"2026-09-06T11:45:09.575Z","contentChangedAt":"2026-09-06T11:45:09.575Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}