io.github.mrfentmen/gemstone-mcp
gemstone-mcp
Is the io.github.mrfentmen/gemstone-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-13.
Gemstone MCP: parse grading reports, validate carat, color, clarity and cut.
alive probed 2026-11-14 · unchanged since 2026-11-13
- Run it
- npx -y @mrfentmen/gemstone-mcp@1.0.0 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- gemstone-mcp 1.0.0
- Capabilities
- tools
- Instructions
- none
- Of a 1M window
- 0.3 % of a 1M context window
- Count
- 2.7k tokens in Claude Opus 5.5, exact, measured 2026-11-13. With the Claude Code prefix mcp__…__ on each tool name: 2.8k. The o200k_base estimate is 1.4k. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/mrfentmen/awesome-servers
- Registry
- active, updated 2026-11-13 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.87×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| search | 269 | 144 | 10 % |
| diff | 244 | 131 | 9 % |
| get_record | 222 | 119 | 8 % |
| write_file | 218 | 117 | 8 % |
| list_records | 216 | 116 | 8 % |
Compare this server with others, or with the servers that share its tool set.
Same tool set as 7 other servers
These registry entries have the same tool names and the same schema sizes.
- io.github.mrfentmen/aama-dxf-mcp npmjs.com
- io.github.mrfentmen/gs1-gdsn-mcp npmjs.com
- io.github.mrfentmen/ipc2581-mcp npmjs.com
- io.github.mrfentmen/nftables-mcp npmjs.com
- io.github.mrfentmen/omop-cdm-mcp npmjs.com
- io.github.mrfentmen/radiance-mcp npmjs.com
- io.github.mrfentmen/seamly2d-mcp npmjs.com
More servers
Other registry entries on npmjs.com, the ones next to this name; all of them.
- io.github.mrfentmen/gdscript-mcp · alive
- io.github.mrfentmen/gdshader-mcp · alive
- io.github.mrfentmen/geckoterminal-mcp · alive
- io.github.mrfentmen/gemini-mcp · alive
- io.github.mrfentmen/genderize-mcp · alive
- io.github.mrfentmen/genero-4gl-mcp · alive
- io.github.mrfentmen/genero-per-mcp · alive
- io.github.mrfentmen/genie-mcp · alive
Servers that mention gemstone.
- Ministry of Gems — Gemmology & Gemstones au.com.ministryofgems/gemmology · alive
- GemstoneAI com.gemstoneaiapp/gemstoneai · needs auth
- Digital Gemology: gemstone and diamond cut library com.digitalgemology/cut-library · alive
- Digital Gemology: gem identification and gemstone properties com.digitalgemology/gem-identification · alive
- Digital Gemology: gemology glossary and grading report terms com.digitalgemology/gemology-glossary · alive
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.