Summary
Connects Claude directly to your GrowthBook account for managing feature flags and experiments without leaving your chat. You can view experiment details, create new feature flags, and perform other operations using your GrowthBook API key or personal access token. Requires your API credentials and email to get started, with optional configuration for self-hosted instances. Permissions mirror what your token allows in the GrowthBook app itself, so if you can't create an experiment in the web UI, you won't be able to here either. Useful when you're deep in conversation about A/B tests or feature rollouts and want to act on them immediately rather than context switching to the browser.
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GrowthBook MCP Server
With the GrowthBook MCP server, you can interact with GrowthBook right from your LLM client. See experiment details, add a feature flag, and more.
Setup
Environment Variables Use the following env variables to configure the MCP server.
| Variable Name | Status | Description |
|---|---|---|
| GB_API_KEY | Required | A GrowthBook API key or PAT. When using a PAT, MCP server capabilities are limited by its permissions. E.g., if the user can't create an experiment in the app, they also won't be able to create one with the MCP server. |
| GB_EMAIL | Required | Your email address used with GrowthBook. Used when creating feature flags and experiments. |
| GB_API_URL | Optional | Your GrowthBook API URL. Defaults to https://api.growthbook.io. |
| GB_APP_ORIGIN | Optional | Your GrowthBook app URL Defaults to https://app.growthbook.io. |
| GB_HTTP_HEADER_* | Optional | Custom HTTP headers to include in all GrowthBook API requests. Use the pattern GB_HTTP_HEADER_<NAME> where <NAME> is converted to proper HTTP header format (underscores become hyphens). Examples: GB_HTTP_HEADER_X_TENANT_ID=abc123 becomes X-Tenant-ID: abc123, GB_HTTP_HEADER_CF_ACCESS_TOKEN=<token> becomes Cf-Access-Token: <token>. Multiple custom headers can be configured. |
Add the MCP server to your AI tool of choice. See the official docs for complete a complete guide.
Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →Configuration
GB_API_KEYA GrowthBook API key or PAT.
GB_EMAILYour email address used with GrowthBook. Used when creating feature flags and experiments.
GB_API_URLYour GrowthBook API URL. Defaults to `https://api.growthbook.io`.
GB_APP_ORIGINYour GrowthBook app URL Defaults to `https://app.growthbook.io`.
GB_HTTP_HEADER_*Custom HTTP headers to include in all GrowthBook API requests. Use the pattern GB_HTTP_HEADER_<NAME> where <NAME> is converted to proper HTTP header format. Examples: GB_HTTP_HEADER_X_TENANT_ID=abc123, GB_HTTP_HEADER_CF_ACCESS_TOKEN=<token>. Multiple custom headers can be configu