io.github.cyanheads/ensembl-mcp-server
ensembl-mcp-server
Look up genes, sequences, variants, homologs, and cross-database xrefs from Ensembl REST.
alive probed 2026-10-14 · HTTP 200
7tools
8.0ktokens in Claude Opus 5.5
8.1ktokens in Claude Code
4.0 %of a 200k context window
4.9ko200k_base estimate
296 msto initialize
92 msto list tools
- Endpoint
- https://ensembl.caseyjhand.com/mcp (streamable-http)
- Host
- ensembl.caseyjhand.com
- Protocol
- 2025-11-25
- Reports itself as
- ensembl-mcp-server 0.6.0
- Capabilities
- logging, prompts, resources, tools
- Instructions
- 609 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-14. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/cyanheads/ensembl-mcp-server
- Registry
- active, updated 2026-10-13 · registry entry
- Reachable
- 8 of the last 8 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| ensembl_get_sequence | 1 087 | 22 % |
| ensembl_query_region | 849 | 17 % |
| ensembl_predict_variant | 785 | 16 % |
| ensembl_lookup_gene | 762 | 15 % |
| ensembl_get_homology | 572 | 12 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-14 09:22 | alive | 651 ms | 7 | 8.0k | 4.9k |
| 2026-10-09 11:18 | alive | 640 ms | 7 | 6.7k | 4.1k |
| 2026-10-05 14:38 | alive | 296 ms | 7 | 6.7k | 4.1k |
| 2026-10-05 00:33 | alive | 186 ms | 7 | 4.1k | |
| 2026-10-04 10:04 | alive | 261 ms | 7 | 4.1k | |
| 2026-10-04 07:57 | alive | 379 ms | 7 | 4.1k | |
| 2026-10-03 20:37 | alive | 865 ms | 7 | 4.1k | |
| 2026-10-03 17:53 | alive | 584 ms | 7 | 4.1k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.cyanheads/ensembl-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.