io.github.luckyjackluo/cairn
Cairn
Is the Cairn MCP server down? Yes. It has given no valid answer since 2026-10-17: crashed on start.
Local-first file-organization tools for your AI agent: tag, query, and digest a folder. No cloud.
crashed on start down since 2026-10-17 · probed 2026-11-14 · unchanged since 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 cairn-mcp-server@0.2.0 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Repository
- https://github.com/luckyjackluo/cairn
- Registry
- active, updated 2026-07-17 · registry entry
Compare this server with others.
More servers
Other registry entries on pypi.org, the ones next to this name; all of them.
- Querido Diário MCP Server io.github.lucaspmgomess/querido-diario-mcp-server · alive
- io.github.lucavisconti211-debug/heu-mcp · crashed on start
- MCP Dados Brasil io.github.lucianoon/mcp-dados-br · alive
- sota-anchor io.github.luckmanqasim/sota-anchor · alive
- pyscn io.github.ludo-technologies/pyscn · alive
- Obsidian Vault MCP io.github.luffysolution-svg/obsidian-vault-mcp · alive
- OmniScholar io.github.luffysolution-svg/omnischolar · alive
- KILN io.github.lukasgolino/kiln · crashed on start
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.cybort360/cairn-mcp · needs mcp<2
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
- No valid answer since 2026-10-17, in every probe since then.
- The package stops at the import of FastMCP from mcp.server.fastmcp. mcp 2.0, the Python SDK of 28 July 2026, renamed FastMCP to MCPServer, and a plain install gets mcp 2.x. Pin mcp<2 in the dependencies, or move to MCPServer as the SDK's migration guide says. The error output is above.
The cause and the fix, with the code before and after: ModuleNotFoundError: No module named 'mcp.server.fastmcp'