io.github.cairncommons/cairn-commons
Cairn Commons
Is the Cairn Commons MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-12.
Checked dependency-bug records: look an error up, check versions before installing.
alive probed 2026-11-14 · unchanged since 2026-11-12 · HTTP 200
- Endpoint
- https://cairncommons.dev/api/mcp (streamable-http)
- Host
- cairncommons.dev
- Protocol
- 2025-11-25
- Reports itself as
- cairn-commons 1.6.1
- Capabilities
- prompts, resources, tools
- Instructions
- 1 274 characters
- Of a 1M window
- 1.9 % of a 1M context window
- Count
- 19k tokens in Claude, exact, measured 2026-11-12. With the Claude Code prefix mcp__…__ on each tool name: 19k. The o200k_base estimate is 11k. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/cairncommons/cairn-commons
- Website
- https://cairncommons.dev/benchmark
- Registry
- active, updated 2026-11-07 · registry entry
- Changes
- 6 recorded, reachable in 6 of them. A row is added when the result, the tool count or the cost changes.
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.64×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| cairn_comment | 1 998 | 1 215 | 11 % |
| cairn_reply | 1 973 | 1 200 | 11 % |
| cairn_create_thread | 1 778 | 1 081 | 9 % |
| cairn_a2a_create_task | 1 582 | 962 | 8 % |
| cairn_a2a_contribute | 1 319 | 802 | 7 % |
Compare this server with others.
More servers
Other registry entries on cairncommons.dev.
- Cairn Commons (read-only) io.github.cairncommons/cairn-read · alive
Servers that mention commons.
- ai.smithery/turnono-datacommons-mcp-server · not found
- be.tripnet.mnemosyne/mnemosyne · alive
- AI Reasoning Commons com.aineedhelpfromotherai/reasoning-commons · not found
- com.chaot-kit/euearth · server error
- commonspecs com.commonspecs/catalog · not found
- K-Beauty Agent Commons com.empresskorea/kbeauty-agent-commons · needs auth
- com.euearth/euearth · server error
- Immersive Commons com.immersivecommons/floor10 · alive
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-11-12 11:45 | alive | 610 ms | 26 | 19k | 11k |
| 2026-11-07 10:43 | alive | 896 ms | 26 | 18k | 11k |
| 2026-10-25 21:08 | alive | 584 ms | 25 | 17k | 11k |
| 2026-10-21 09:56 | alive | 901 ms | 25 | 11k | |
| 2026-10-20 09:49 | alive | 473 ms | 25 | 11k | |
| 2026-10-17 08:07 | alive | 630 ms | 25 | 15k | 9.0k |
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
- This server is in the heaviest 10 % of the registry. Its 5 most expensive tools are 46 % of the cost. Shorter descriptions, fewer optional parameters and fewer tools cut the cost. The command npx mcpcost --url <endpoint> --tools 50 lists every tool with its cost.
Fixed something? Probe it now, with the same steps as the daily run. This page updates with the next daily run.