{"record":{"id":"b81a6ff5528b3f1b","repo":"chenhg5/cc-connect","slug":"claudecode-open-session-file-w","errorCode":null,"errorMessage":"claudecode: open session file: %w","messagePattern":"claudecode: open session file: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"agent/claudecode/claudecode.go","lineNumber":737,"sourceCode":"// GetSessionHistory reads the Claude Code JSONL transcript and returns user/assistant messages.\nfunc (a *Agent) GetSessionHistory(_ context.Context, sessionID string, limit int) ([]core.HistoryEntry, error) {\n\thomeDir, err := os.UserHomeDir()\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\ta.mu.RLock()\n\tworkDir := a.workDir\n\ta.mu.RUnlock()\n\tabsWorkDir, _ := filepath.Abs(workDir)\n\tprojectDir := findProjectDir(homeDir, absWorkDir)\n\tif projectDir == \"\" {\n\t\treturn nil, fmt.Errorf(\"claudecode: project dir not found\")\n\t}\n\n\tpath := filepath.Join(projectDir, sessionID+\".jsonl\")\n\tf, err := os.Open(path)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"claudecode: open session file: %w\", err)\n\t}\n\tdefer f.Close()\n\n\tvar entries []core.HistoryEntry\n\tscanner := bufio.NewScanner(f)\n\tscanner.Buffer(make([]byte, 256*1024), 256*1024)\n\n\tfor scanner.Scan() {\n\t\tvar raw struct {\n\t\t\tType      string `json:\"type\"`\n\t\t\tTimestamp string `json:\"timestamp\"`\n\t\t\tMessage   struct {\n\t\t\t\tRole    string          `json:\"role\"`\n\t\t\t\tContent json.RawMessage `json:\"content\"`\n\t\t\t} `json:\"message\"`\n\t\t}\n\t\tif json.Unmarshal(scanner.Bytes(), &raw) != nil {\n\t\t\tcontinue","sourceCodeStart":719,"sourceCodeEnd":755,"githubUrl":"https://github.com/chenhg5/cc-connect/blob/4000b2338aa6e850c99df54f8b0ed6ed7460b401/agent/claudecode/claudecode.go#L719-L755","documentation":"GetSessionHistory (agent/claudecode/claudecode.go:737) opens <projectDir>/<sessionID>.jsonl to parse transcript entries. If os.Open fails (file missing, permission denied, path is a directory), it wraps the error as 'claudecode: open session file: %w'. The underlying OS error is preserved, so inspect %w to distinguish not-exist from permission problems.","triggerScenarios":"Calling GetSessionHistory(ctx, sessionID) where the project dir exists but the session file cannot be opened: unknown sessionID (no .jsonl file), file deleted mid-session, or read permission denied on the transcript.","commonSituations":"Requesting history for a session ID that belongs to a different work_dir/project; Claude Code cleaned old transcripts; running cc-connect as a service user lacking read access to another user's ~/.claude; typo'd or truncated session ID pasted from chat.","solutions":["Use errors.Is(err, fs.ErrNotExist) to detect an unknown/stale session ID and return a friendly 'session not found' instead of the raw wrap.","Verify the session ID with ListSessions(ctx, workDir) before querying history.","Check file permissions: the user running cc-connect must be able to read ~/.claude/projects/<dir>/<id>.jsonl.","If history was just requested for an active session, retry briefly — the transcript may not have been flushed yet."],"exampleFix":"// before\nentries, err := agent.GetSessionHistory(ctx, sessionID)\nif err != nil { return err }\n// after\nentries, err := agent.GetSessionHistory(ctx, sessionID)\nif err != nil {\n    if errors.Is(err, fs.ErrNotExist) {\n        return fmt.Errorf(\"no history for session %s\", sessionID)\n    }\n    return err\n}","handlingStrategy":"try-catch","validationCode":"p := filepath.Join(home, \".claude\", \"projects\", encodedDir, sessionID+\".jsonl\")\nif _, err := os.Stat(p); err != nil {\n    return fmt.Errorf(\"no transcript at %s\", p)\n}","typeGuard":null,"tryCatchPattern":"entries, err := agent.GetSessionHistory(ctx, id)\nif err != nil {\n    if errors.Is(err, fs.ErrNotExist) {\n        return nil, fmt.Errorf(\"no history for session %s\", id)\n    }\n    if errors.Is(err, fs.ErrPermission) {\n        return nil, fmt.Errorf(\"cannot read transcript: check file permissions\")\n    }\n    return err\n}","preventionTips":["Unwrap with errors.Is/fs.Err* to distinguish not-exist vs permission vs other.","Validate session IDs via ListSessions before history queries.","Run cc-connect as a user with read access to the transcript directory.","For fresh sessions, allow a brief delay/retry — the .jsonl may not be flushed yet."],"tags":["claudecode","session-history","file-read"],"backgroundTag":"file-open-failed","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"}