@growthbook/mcp

What it does

The GrowthBook MCP server connects Claude to GrowthBook's experimentation platform. According to the README, you can view experiment details and manage feature flags; the server also communicates with GrowthBook's API to perform related operations.

Who it's for

Product managers and engineers who run A/B tests and manage feature flags in GrowthBook and want to query or modify them from Claude or other LLM clients without context-switching to the web UI.

Common use cases

• Query experiment details and results while analyzing feature impact
• Create and manage feature flags from Claude
• Check feature flag status during code reviews or development
• Inspect experiment metrics to inform product decisions
• Access GrowthBook data without leaving your LLM client

Setup pitfalls

• Requires two environment variables: GB_API_KEY (a GrowthBook API key or personal access token) and GB_EMAIL. PAT permissions are enforced—if you cannot create experiments in the GrowthBook UI, you will not be able to via the MCP server.
• CI is currently failing; test compatibility with your GrowthBook instance before deploying in production.
• The server reads and writes to the filesystem—ensure proper sandboxing if running untrusted code.
• Custom HTTP headers (GB_HTTP_HEADER_*) require proper formatting; underscores are converted to hyphens in header names.