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Growthbook MCP Server

by growthbook Your server? Claim it
local only

Growthbook MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 6 106 installs a week from npm. Last commit 21 Sep 2026.

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

Installs per day peak 1 908 · avg 904 · +103% w/w
a month agotoday
6 106
Installs / week
npm · @growthbook/mcp
24
Stars
8 open issues
21 Sep 2026
Last commit
0 releases in 90 days
MIT
License
TypeScript

What the code does

We read the source, 7 h ago · rules 3dff92dd89df

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

File ships in the package but is absent from the source [пакет] server/api.js:1, [пакет] server/http.js:1, [пакет] server/index.js:1 и ещё 2
этот файл ставится пользователю, но в репозитории его нет
Dumps the whole environment src/api.ts:99, [пакет] server/api.js:77
  for (const [key, value] of Object.entries(process.env)) {

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add growthbook-mcp -- npx -y @growthbook/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "growthbook-mcp": {
      "args": [
        "-y",
        "@growthbook/mcp"
      ],
      "command": "npx"
    }
  }
}
~/.codex/config.toml
[mcp_servers.growthbook-mcp]
command = "npx"
args = ["-y", "@growthbook/mcp"]
.cursor/mcp.json
{
  "mcpServers": {
    "growthbook-mcp": {
      "args": [
        "-y",
        "@growthbook/mcp"
      ],
      "command": "npx"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "growthbook-mcp": {
      "args": [
        "-y",
        "@growthbook/mcp"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: GB_API_KEY (A GrowthBook API key or personal access token.), GB_API_URL (Your GrowthBook API URL. Defaults to https://api.growthbook.io.), GB_SKILLS_ENABLED (Set to false to disable bundled skill tools (growthbook_list_skills, growthbook_read_skill). Defaults to true.), GB_HTTP_HEADER_* (Custom HTTP headers via GB_HTTP_HEADER_<NAME> (e.g. GB_HTTP_HEADER_CF_ACCESS_TOKEN).). The author declared them in the registry entry; get the values from the project itself.

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Growthbook MCP — questions

Answers built from our own checks of this server.

Why is there no uptime for Growthbook MCP?
Growthbook MCP runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package @growthbook/mcp was installed 6 106 times last week.
How do I connect Growthbook MCP?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls @growthbook/mcp straight from npm; nothing to host, nothing to sign up for.
How many people use Growthbook MCP?
The npm package @growthbook/mcp was installed 6 106 times in the last week. Week over week that is +103%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Growthbook MCP open source?
Yes — it is published under the MIT licence, written in TypeScript, 24 stars on GitHub and 8 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.