io.github.hernaninverso/costwright-mcp
costwright — agent budget analysis
Is the costwright MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-31.
Static worst-case token-budget analysis for LLM-agent workflows + signed budget certificates.
alive probed 2026-11-15 · unchanged since 2026-10-31
- Run it
- npx -y costwright-mcp@0.1.1 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- costwright 0.1.0
- Capabilities
- tools
- Instructions
- none
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 871 tokens in Claude Opus 5.5, exact, measured 2026-10-17. With the Claude Code prefix mcp__…__ on each tool name: 919. The o200k_base estimate is 481. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/hernaninverso/costwright-mcp
- Registry
- active, updated 2026-06-30 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.81×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| costwright_check | 306 | 169 | 35 % |
| costwright_certify | 304 | 168 | 35 % |
| costwright_verify | 163 | 90 | 19 % |
| costwright_pubkey | 98 | 54 | 11 % |
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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.