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Growthbook Mcp

io.github.growthbook/growthbook-mcp · v2.2.0

Thin MCP server for GrowthBook — skill loader + authenticated API passthrough

Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add growthbook-mcp -e GB_API_KEY=<GB_API_KEY> -e GB_API_URL=<GB_API_URL> -e GB_SKILLS_ENABLED=<GB_SKILLS_ENABLED> -e GB_HTTP_HEADER_*=<GB_HTTP_HEADER_*> -- npx -y @growthbook/[email protected]
claude_desktop_config.json
{
  "mcpServers": {
    "growthbook-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@growthbook/[email protected]"
      ],
      "env": {
        "GB_API_KEY": "<GB_API_KEY>",
        "GB_API_URL": "<GB_API_URL>",
        "GB_SKILLS_ENABLED": "<GB_SKILLS_ENABLED>",
        "GB_HTTP_HEADER_*": "<GB_HTTP_HEADER_*>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "growthbook-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@growthbook/[email protected]"
      ],
      "env": {
        "GB_API_KEY": "<GB_API_KEY>",
        "GB_API_URL": "<GB_API_URL>",
        "GB_SKILLS_ENABLED": "<GB_SKILLS_ENABLED>",
        "GB_HTTP_HEADER_*": "<GB_HTTP_HEADER_*>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "growthbook-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@growthbook/[email protected]"
      ],
      "env": {
        "GB_API_KEY": "<GB_API_KEY>",
        "GB_API_URL": "<GB_API_URL>",
        "GB_SKILLS_ENABLED": "<GB_SKILLS_ENABLED>",
        "GB_HTTP_HEADER_*": "<GB_HTTP_HEADER_*>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
GB_API_KEY
Optional		A GrowthBook API key or personal access token.
GB_API_URL
Optional		Your GrowthBook API URL. Defaults to https://api.growthbook.io.
GB_SKILLS_ENABLED
Optional		Set to false to disable bundled skill tools (growthbook_list_skills, growthbook_read_skill). Defaults to true.
GB_HTTP_HEADER_*
Optional		Custom HTTP headers via GB_HTTP_HEADER_<NAME> (e.g. GB_HTTP_HEADER_CF_ACCESS_TOKEN).

Details

Package@growthbook/[email protected] (NPM, stdio)
First published6 Oct 2026
Last updated6 Oct 2026
Registry nameio.github.growthbook/growthbook-mcp

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