growthbook/growthbook-mcp

MCP Server for interacting with GrowthBook

→ growthbook/growthbook-mcp· npm: @growthbook/mcp· listed on npm

Install from

npm npm mcp.so

M8ven verifies MCPs across every public registry — install directly from whichever one you prefer.

// key findings

⚠️

Tool descriptions don’t match what handlers do

1 tool describes read intent but its handler mutates — set_user_defaults (line 441: mkdir(experimentDefaultsDir, { recursive: true }))

✅

18 tools verified — handlers match their declared behaviour

11 read-only tools verified — handlers contain no write/delete/exec

✅

No credential exfiltration, no sensitive file access, no obfuscation

Static analysis found nothing flowing your secrets to unexpected places.

✅

Open source with a license and README

Anyone can audit the code, the license is declared, and the publisher documents what it does.

🔐

You'll be asked for 2 credentials: GB_API_KEY, GB_HTTP_HEADER_CF_ACCESS_TOKEN

These are read from process.env at runtime. Make sure you trust where they’ll be sent.

// required environment variables

This server reads these from process.env. You'll be asked to provide them before it can run.

configCUSTOM_HEADER

🔐 secretGB_API_KEY

configGB_API_URL— Optional Your GrowthBook API URL. Defaults to https://api.growthbook.io.

configGB_APP_ORIGIN— Optional Your GrowthBook app URL Defaults to https://app.growthbook.io.

configGB_EMAIL— Required Your email address used with GrowthBook. Used when creating feature flags and experiments.

configGB_HTTP_HEADER_API_KEY_ID

configGB_HTTP_HEADER_AUTHORIZATION

🔐 secretGB_HTTP_HEADER_CF_ACCESS_TOKEN

configGB_HTTP_HEADER_CONTENT_ENCODING

configGB_HTTP_HEADER_CONTENT_TYPE

configGB_HTTP_HEADER_CUSTOM_TRACE_ID

configGB_HTTP_HEADER_EMPTY

configGB_HTTP_HEADER_INCLUDED

configGB_HTTP_HEADER_VALID

configGB_HTTP_HEADER_X

configGB_HTTP_HEADER_X_CUSTOM

configGB_HTTP_HEADER_X_CUSTOM_USER_AGENT

configGB_HTTP_HEADER_X_SESSION_ID

configGB_HTTP_HEADER_X_TENANT_ID

configGB_HTTP_HEADER_X_USER_ID

// full audit trail

The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.

// improvement guidance — verified publishers only

We have 4 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.

// embed badge in your README

[![M8ven Score](https://m8ven.ai/badge/mcp/npm-https-github-com-growthbook-growthbook-mcp)](https://m8ven.ai/mcp/npm-https-github-com-growthbook-growthbook-mcp)

commit: 214622b541b7b32967de77ed8973258a0c66b862

code hash: 724b449ee0d9c4afefc9a400ac48dea6b41cc9794977e72adb29428a97ed2e42

verified: 4/11/2026, 1:42:03 PM

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