io.github.mrfentmen/chembl-mcp
chembl-mcp
Drug molecules and bioactivity from the ChEMBL database. No key required.
alive probed 2026-10-15
2tools
263tokens in Claude Opus 5.5
287tokens in Claude Code
0.1 %of a 200k context window
140o200k_base estimate
206 msto initialize
5 msto list tools
- Run it
- npx -y chembl-mcp@1.0.1 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- chembl-mcp 1.0.0
- Capabilities
- tools
- Instructions
- none
- Claude count
- Claude Opus 5.5, measured 2026-10-15. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/mrfentmen/chembl-mcp
- Registry
- active, updated 2026-09-21 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| search | 71 | 51 % |
| molecule | 69 | 49 % |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.mrfentmen/chembl-mcp)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.