io.github.neurynae/toolcairn-mcp
toolcairn
Is the io.github.neurynae/toolcairn-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-31.
MCP server for tool discovery: find, compare, and verify tools across 35+ registries.
alive probed 2026-11-15 · unchanged since 2026-10-31
- Run it
- npx -y @neurynae/toolcairn-mcp@1.0.0 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- toolcairn 0.1.0
- Capabilities
- tools
- Instructions
- 106 characters
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 123 tokens in Claude Opus 5.5, exact, measured 2026-10-17. With the Claude Code prefix mcp__…__ on each tool name: 137. The o200k_base estimate is 66. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/neurynae/toolcairn-mcp
- Registry
- active, updated 2026-05-01 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.86×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| toolcairn_auth | 123 | 66 | 100 % |
Compare this server with others.
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- io.github.newrelic-experimental/preflight · needs env
Servers that mention registries or discovery.
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- China Marketing AI Intelligence MCP ai.chinamarketing/intelligence · needs auth
- Creator SKILL v2 — Influencer Discovery ai.deinai/creator-skill-v2 · needs auth
- Creator SKILL — Influencer Discovery ai.deinai/creator-skill · needs auth
- Demand Discovery AI ai.demanddiscovery/mcp · alive
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- InfraPulse ai.infrapulse/infrapulse · rejects our protocol version
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 server answers initialize and tools/list. Nothing to fix.