Look up genes, sequences, variants, homologs, and cross-database xrefs from Ensembl REST.
Connect Remote server
claude mcp add --transport http ensembl-mcp-server https://ensembl.caseyjhand.com/mcp
{
"mcpServers": {
"ensembl-mcp-server": {
"url": "https://ensembl.caseyjhand.com/mcp"
}
}
}
{
"servers": {
"ensembl-mcp-server": {
"type": "http",
"url": "https://ensembl.caseyjhand.com/mcp"
}
}
}
Settings > Connectors > Add custom connector
URL: https://ensembl.caseyjhand.com/mcp
Tools 7 found in our last check
ensembl_list_speciesList species supported by Ensembl with display name, common name, assembly, taxon ID, and division. Required discovery step — species names like homo_sapiens are opaque to non-biologists and are the input format every other Ensembl tool expects. Use nameContains to find a specie…
ensembl_lookup_geneResolve a gene by symbol + species (or by stable ID) to its Ensembl ID, genomic location (chr:start-end:strand), biotype, description, and transcript list. Entry point for most workflows — the stable ID and coordinates returned here are inputs to other tools. Accepts both symbol…
ensembl_get_sequenceFetch the DNA, cDNA, CDS, or protein sequence for a gene, transcript, protein, or genomic region. Returns a window of the sequence — the first 10,000 characters by default — with its stable ID, molecule type, and full length. When more follows the window, truncated is true and n…
ensembl_query_regionFind genomic features overlapping a chromosomal region: genes, transcripts, variants, regulatory elements, or exons. Returns each feature with its stable ID, type, location, biotype, and name, plus the genome assembly the coordinates are on. Useful for "what's in this locus?" an…
ensembl_predict_variantPredict the functional consequences of a sequence variant using the Ensembl Variant Effect Predictor (VEP). Accepts three input formats: HGVS notation (transcript-relative, e.g. ENST00000380152.8:c.2T>A, or genomic, e.g. 13:g.32316462T>A); region+allele (chr:start:end:strand/all…
ensembl_get_homologyFind orthologs and/or paralogs of a gene across species. Returns each homolog's stable ID, species, homology type (ortholog_one2one, ortholog_one2many, paralog_many2many, etc.), percId and percPos (percent identical and positive positions, over the target protein's length), and…
ensembl_get_xrefsRetrieve cross-database references for a gene or feature — HGNC, UniProt, EntrezGene, OMIM, RefSeq, Reactome, and others. Returns each xref with its database name, primary ID, display ID, and description, plus how Ensembl assigned it (infoType, infoText) and its evidence codes (…
Details
| Endpoint | https://ensembl.caseyjhand.com/mcp (Streamable HTTP) |
| Package | @cyanheads/[email protected] (NPM, stdio) |
| Package | @cyanheads/[email protected] (NPM, streamable-http) |
| First published | 29 Oct 2026 |
| Last updated | 29 Oct 2026 |
| Registry name | io.github.cyanheads/ensembl-mcp-server |
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