io.github.cybort360/cairn-mcp
Cairn
Is the Cairn MCP server down? No. Installed with mcp<2, it started and listed its tools on 2026-10-31.
Log Claude Code work sessions, file edits, and tasks to your Cairn account.
needs mcp<2 probed 2026-11-14 · unchanged since 2026-10-31
A plain install of the package stops at the import below. These tool definitions are from a second install with mcp<2, started in a container with the network off, on 2026-10-31.
MCP error -32000: Connection closed ModuleNotFoundError: No module named 'mcp.server.fastmcp'. This is mcp 2.x, where FastMCP was renamed to MCPServer (from mcp
- Run it
- uvx --with 'mcp<2' cairn-mcp@0.1.2 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Reports itself as
- cairn 1.30.0
- Capabilities
- experimental, prompts, resources, tools
- Repository
- https://github.com/cybort360/cairn
- Registry
- active, updated 2026-06-21 · registry entry
- Changes
- 2 recorded, reachable in 0 of them. A row is added when the result, the tool count or the cost changes.
Most expensive tools
Estimates with the o200k_base tokenizer.
| Tool | o200k estimate | Share of this server |
|---|---|---|
| task_update | 311 | 16 % |
| task_create | 264 | 13 % |
| task_list | 230 | 11 % |
| file_activity_log | 216 | 11 % |
| work_log_list | 214 | 11 % |
Compare this server with others.
More servers
Other registry entries on pypi.org, the ones next to this name; all of them.
- McuBuddy io.github.cunjun/mcubuddy · needs mcp<2
- Swiss Weather io.github.cuolm/swiss-weather-mcp · alive
- code-graph io.github.cyberchronos00/cg-code-graph · alive
- io.github.cyberpapiii/imessage-max · install failed
- io.github.cygnussystems/cygnus-ssh-mcp · crashed on start
- Audio Transcription MCP io.github.cykk/audio-transcription-mcp · alive
- Cyntrisec CLI (Historical) io.github.cyntrisec/cyntrisec · crashed on start
- Codex ServerOps MCP io.github.cyyprezz/codex-serverops-mcp · install failed
Servers that mention cairn.
- Chaparral Software MCP com.chapsoft/mcp · alive
- Cairn — keep your agent's daily build streak (public trail + badge) dev.workers.notdown-app.cairn/daily-build-streak-accountability-tracker · alive
- Cairn.ink Memory ink.cairn/memory · needs auth
- WEE WiLDS Booking com.weewilds/booking · alive
- Cairn com.cairnsafe/cairn · alive
- Cairn Commons io.github.cairncommons/cairn-commons · alive
- Cairn Remembers io.github.CairnRemembers/cairn-remembers · alive
- Cairn io.github.luckyjackluo/cairn · crashed on start
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-31 07:35 | needs mcp<2 | 1.7 s | 11 | 3.9k | 2.0k |
| 2026-10-17 06:14 | crashed on start |
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The package imports FastMCP from mcp.server.fastmcp. mcp 2.0, the Python SDK of 28 July 2026, renamed FastMCP to MCPServer, and the package asks for mcp with no upper bound, so a plain install (uvx, pip) gets mcp 2.x and the server stops at the import. Installed with mcp<2, it starts and lists its tools. The fix for the publisher: pin mcp<2 in the dependencies, for example mcp>=1.2,<2, and publish a new version, or move to MCPServer as the SDK's migration guide says. Until then, run it with uvx --with 'mcp<2'.
The cause and the fix, with the code before and after: ModuleNotFoundError: No module named 'mcp.server.fastmcp'