io.github.cyanheads/chembl-mcp-server
chembl-mcp-server
Link compounds to protein targets, rank bioactivity, and look up drug mechanisms and indications.
alive probed 2026-10-11 · HTTP 200
7tools
4.9ktokens in Claude Opus 5.5
5.0ktokens in Claude Code
2.5 %of a 200k context window
3.0ko200k_base estimate
322 msto initialize
87 msto list tools
- Endpoint
- https://chembl.caseyjhand.com/mcp (streamable-http)
- Host
- chembl.caseyjhand.com
- Protocol
- 2025-11-25
- Reports itself as
- chembl-mcp-server 0.3.3
- Capabilities
- logging, prompts, resources, tools
- Instructions
- 1 594 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-05. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/cyanheads/chembl-mcp-server
- Registry
- active, updated 2026-10-10 · registry entry
- Reachable
- 7 of the last 7 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| chembl_get_bioactivities | 986 | 33 % |
| chembl_search_molecules | 567 | 19 % |
| chembl_search_targets | 453 | 15 % |
| chembl_dataframe_query | 356 | 12 % |
| chembl_get_drug_info | 288 | 10 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-11 10:24 | alive | 1.0 s | 7 | 4.9k | 3.0k |
| 2026-10-05 14:38 | alive | 322 ms | 7 | 4.9k | 3.0k |
| 2026-10-05 00:33 | alive | 180 ms | 7 | 3.0k | |
| 2026-10-04 10:04 | alive | 782 ms | 7 | 3.0k | |
| 2026-10-04 07:57 | alive | 503 ms | 7 | 3.0k | |
| 2026-10-03 20:37 | alive | 998 ms | 7 | 3.0k | |
| 2026-10-03 17:53 | alive | 554 ms | 7 | 3.0k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.cyanheads/chembl-mcp-server)
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.