ChatGPT chembl mcp server chembl_search_molecules
How to: ChatGPT chembl mcp server chembl_search_molecules
Add chembl mcp server to ChatGPT
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01
Open Settings → Connectors → Advanced → Developer mode and merge this in. Keep any servers already there.
https://chembl.caseyjhand.com/mcp-
02
Save the file and restart ChatGPT.
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03
Ask for something chembl_search_molecules does. ChatGPT lists the server's tools on connect and calls chembl_search_molecules itself — you do not invoke it by name.
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04
If nothing happens, check the server is running and that chembl mcp server's identifier in your config matches the one above exactly.
Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs
Set these first
chembl mcp server will not start until these are set, so chembl_search_molecules never becomes available.
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CANVAS_PROVIDER_TYPE -
CHEMBL_API_BASE_URL -
CHEMBL_REQUEST_TIMEOUT_MS -
CHEMBL_MAX_PAGE_SIZE -
CHEMBL_DEFAULT_LIMIT -
CHEMBL_MAX_SPILL_ROWS -
CHEMBL_DATAFRAME_DROP_ENABLED -
MCP_LOG_LEVEL
Same tool, other clients
This list was read from the server itself, by connecting to it and calling tools/list on 24 September 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.