feat: implement unstable_listSessions for session/list RFD #254
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@remorses thanks for this! I was planning to just deal with file parsing as well in the meantime. I'll give this a look, but would be great to have for sure, thanks for taking a look! |
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Pull request overview
This PR implements the draft session/list RFD specification by adding the ability to list Claude Code sessions stored in the local filesystem. The implementation reads and parses JSONL session files from ~/.claude/projects/, extracts session metadata (title, timestamp, cwd), and provides pagination support.
Changes:
- Added
unstable_listSessionsmethod that parses session files from local storage - Advertised
listcapability in thesessionCapabilitiesinitialization response - Implemented cursor-based pagination with page size of 50 sessions
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Ok I will add tests. I wanted to make sure this feature was welcome first |
benbrandt
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Jan 26, 2026
21 tasks
Adds support for the draft session/list RFD spec by reading Claude Code's local session files from ~/.claude/projects/. - Parse JSONL session files to extract sessionId, cwd, title, updatedAt - Support filtering by cwd parameter - Implement cursor-based pagination (50 sessions per page) - Advertise list capability in sessionCapabilities
Tests cover: - Empty/missing projects directory - Session file parsing (sessionId, cwd, title, updatedAt) - Title extraction from string and array message formats - Filtering by cwd parameter - Sorting by updatedAt descending - Skipping agent-* files and malformed files - Cursor-based pagination
Claude encodes paths as: /Users/morse/project -> -Users-morse-project (leading dash, all slashes become dashes)
- Add comment explaining agent-*.jsonl file filtering - Use safer firstLine variable instead of lines[0]! assertion - Improve title extraction with explicit type guards for array content
- Add decodeProjectPath() helper that handles both Unix and Windows paths - Unix: '-Users-morse-project' -> '/Users/morse/project' - Windows: 'C-Users-morse-project' -> 'C:\Users\morse\project' - Update test helper to encode Windows paths correctly - Add 3 new tests for Windows path handling
The upstream codebase uses process.env.CLAUDE to override the config dir, but this is undocumented and could conflict with user env vars. Tests save/restore the original value to avoid side effects.
- Use CLAUDE_CONFIG_DIR const instead of runtime env check - Use async fs.promises for non-blocking operations - Add this.logger.error() for error logging - Add comment explaining pagination rationale - Update tests to use vi.resetModules() for proper CLAUDE_CONFIG_DIR handling
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thanks! It is working for me, so I'll merge and we can see what feedback we get |
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Adds support for the draft session/list RFD spec by reading Claude Code's local session files.
unstable_listSessionsmethod that parses JSONL session files from~/.claude/projects/listcapability insessionCapabilitiescwdparameterupdatedAtRelated: https://agentclientprotocol.com/rfds/session-list
What do you think @benbrandt? Is it ok to do the json files parsing ourselves? I also opened an issue in the claude agent sdk repo but I doubt they will add that functionality in the sdk npm package