Ensembl MCP Server vs Pubchem MCP Server
A side-by-side look at the Ensembl MCP Server and Pubchem MCP Server MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Ensembl MCP Server for biology & bioinformatics work as a local process; choose Pubchem MCP Server for biology & bioinformatics as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Ensembl MCP Server when
- You need dedicated capabilities in the Biology & Bioinformatics domain.
- You prefer a local stdio subprocess transport.
- You want tools like
ensembl_list_species, ensembl_lookup_gene, ensembl_get_sequence.
Choose Pubchem MCP Server when
- You need dedicated capabilities in the Biology & Bioinformatics domain.
- You prefer a local stdio subprocess transport.
- You want tools like
pubchem_search_compounds, pubchem_get_compound_details, pubchem_get_compound_image.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Biology & Bioinformatics | Biology & Bioinformatics |
| Quality signal | 57/100 · Good | 55/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | Not declared |
| Pricing | Not declared | Not declared |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 3 | 10 |
| Directory activity | 1 views 0 installs 0 upvotes | 1 views 0 installs 0 upvotes |
| Tools | 7 | 10 |
| Full listing | View Ensembl MCP Server | View Pubchem MCP Server |
Tools & capabilities
Ensembl MCP Server tools 7
ensembl_list_speciesList species supported by Ensembl with display name, common name, assembly, taxon ID, and divisionensembl_lookup_geneResolve a gene by symbol (synonyms and former symbols included) + species or by stable ID to its Ensembl ID, genomic location, biotype, and transcript listensembl_get_sequenceFetch the DNA, cDNA, CDS, or protein sequence for a gene, transcript, protein, or genomic regionensembl_query_regionFind genomic features (genes, transcripts, variants, regulatory elements, exons) overlapping a chromosomal regionensembl_predict_variantPredict functional consequences of a sequence variant using the Ensembl Variant Effect Predictor (VEP)ensembl_get_homologyFind orthologs and/or paralogs of a gene across species with percent identity and taxonomy levelensembl_get_xrefsRetrieve cross-database references for a gene — HGNC, UniProt, EntrezGene, OMIM, RefSeq, Reactome, and others
Pubchem MCP Server tools 10
pubchem_search_compoundsSearch for compounds by name, SMILES, InChIKey, formula, substructure, superstructure, or 2D similarity, or list the compounds a bioassay found active.pubchem_get_compound_detailsGet physicochemical properties, descriptions, synonyms, drug-likeness, and classification for compounds by CID.pubchem_get_compound_imageFetch a 2D structure diagram (PNG) for a compound by CID.pubchem_get_compound_3d_structureFetch a 3D conformer (atomic coordinates and bonds) for a compound by CID, as parsed JSON or raw SDF.pubchem_get_compound_xrefsGet external database cross-references (PubMed, patents, genes, proteins, etc.).pubchem_get_compound_safetyGet GHS hazard classification and safety data for one or more compounds by CID (batch).pubchem_get_bioactivityGet a compound's bioactivity profile: assay results, targets, and activity values; filter by outcome or molecular target.pubchem_get_compound_interactionsGet drug-drug, drug-food, and chemical-target interactions for a compound by CID.pubchem_search_assaysFind bioassays by biological target (gene symbol, protein, Gene ID, UniProt accession).pubchem_get_summaryGet summaries for PubChem entities: assays, genes, proteins, taxonomy.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Ensembl MCP Server
{
"mcpServers": {
"ensembl-mcp-server": {
"command": "bunx",
"args": [
"@cyanheads/ensembl-mcp-server@latest"
]
}
}
}
Pubchem MCP Server
{
"mcpServers": {
"pubchem-mcp-server": {
"command": "bunx",
"args": [
"@cyanheads/pubchem-mcp-server@latest"
]
}
}
}
Frequently asked questions
Ensembl MCP Server is categorized under Biology & Bioinformatics and uses a local stdio subprocess. Pubchem MCP Server belongs to Biology & Bioinformatics and uses a local stdio subprocess. Pick Ensembl MCP Server for biology & bioinformatics work and Pubchem MCP Server for biology & bioinformatics.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Ensembl MCP Server has no declared pricing — check the project's own site. Pubchem MCP Server has no declared pricing — check the project's own site. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add ensembl-mcp-server and pubchem-mcp-server as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Ensembl MCP Server has a quality signal of 57/100 (Good) with 1 views, 0 installs and 3 GitHub stars. Pubchem MCP Server has 55/100 (Good) with 1 views, 0 installs and 10 GitHub stars.