Gemini CLI chembl mcp server chembl_dataframe_query

How to: Gemini CLI chembl mcp server chembl_dataframe_query

client:Gemini CLI transport:streamable-http tool:chembl_dataframe_query

Add chembl mcp server to Gemini CLI

01
Open ~/.gemini/settings.json and merge this in. Keep any servers already there.

{
  "mcpServers": {
    "chembl-mcp-server": {
      "httpUrl": "https://chembl.caseyjhand.com/mcp"
    }
  }
}

02
Save the file and restart Gemini CLI.
03
Ask for something chembl_dataframe_query does. Gemini CLI lists the server's tools on connect and calls chembl_dataframe_query itself — you do not invoke it by name.
04
If nothing happens, check the server is running and that chembl mcp server's identifier in your config matches the one above exactly.

Gemini expands $VAR and ${VAR} inside env values, so a secret can live in your shell rather than this file. Gemini CLI docs

Set these first

chembl mcp server will not start until these are set, so chembl_dataframe_query never becomes available.

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.

chembl mcp server MCP server