# GrowthBook (slim)

> GrowthBook is an open-source platform for feature flags, experiments and product analytics, sold as GrowthBook Cloud or run self-hosted. Agents reach it through a REST API with a public OpenAPI spec and an official MCP server.

- Full: https://www.anchorterminal.com/tools/growthbook.md (~8,350 tokens) · this version ~2,030 tokens · JSON https://www.anchorterminal.com/tools/growthbook.json · canonical https://www.anchorterminal.com/tools/growthbook
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

**BB · 70.1/100 · rank #142 of 722 · #2 in Product analytics & experimentation · agent-ready · confidence medium**


Assessment: GrowthBook Cloud's MCP server has four tools with read and write annotations, OAuth with dynamic client registration, and a 414-operation OpenAPI spec behind it. The free plan needs no card. The API tools pass paths and JSON bodies through without validation, every key is limited to 60 requests a minute, and audit logs are Enterprise only.

## Facts

- Kind: HTTP API · vendor: GrowthBook, Inc. · category: Product analytics & experimentation · legal entity: GrowthBook, Inc. · provenance 81/100
- Endpoint: `https://mcp.growthbook.io/mcp` (HTTP, Streamable HTTP, stdio)
- Auth: OAuth or key · pricing: Freemium · x402: no · licence: MIT for the core and for the MCP server. Three enterprise directories in the main repository are under GrowthBook's enterprise licence. GrowthBook Cloud is a hosted service under the Customer Agreement
- Probe metrics: not measured yet (probes haven't run)
- Surface graded: GrowthBook Cloud. The official hosted MCP server at https://mcp.growthbook.io/mcp and the REST API at https://api.growthbook.io/api. The SDK endpoints on cdn.growthbook.io and a self-hosted install were not graded
- MCP server: Streamable HTTP with OAuth on Cloud, or stdio through `npx -y @growthbook/mcp@latest` with `GB_API_KEY`, or the Docker image ghcr.io/growthbook/growthbook-mcp. Version 2.2.0, MIT, Node 18 or later
- MCP tools: `growthbook_list_skills`, `growthbook_read_skill`, `growthbook_api_read` (GET) and `growthbook_api_write` (POST, PUT, PATCH, DELETE). Each has readOnlyHint and destructiveHint. /mcp/api exposes the two API tools alone
- REST API: OpenAPI 3.1, spec version 5.1.0, 306 paths and 414 operations on 8 October 2026 (179 POST, 138 GET, 58 PUT, 39 DELETE). /v1 is stable and /v2 has newer shapes for feature flags and metrics
- Credentials: OAuth with PKCE, dynamic client registration, refresh and revocation for MCP. Personal Access Tokens with the user's permissions or fewer, and Secret Keys with a role, per-project overrides, environment limits and optional expiry
- Rate limits: 60 requests a minute per API key on Cloud. The server sends the standard RateLimit headers, and the MCP server waits for `RateLimit-Reset` and retries up to 3 times
- Pagination: `limit` (default 10, maximum 100) and `offset` on 40 list operations, with filters such as `projectId`, `datasourceId` and `status`
- Errors: 400, 401, 402, 403, 404, 422, 429 and 5XX with a JSON `message`. 422 is a soft warning that can be resubmitted with `?ignoreWarnings=true`
- Plans: Starter free (3 users, 1 project, 1 million CDN requests, 5 GB, 1 million Managed Warehouse events a month). Pro $40 a seat a month (30 users, 3 projects). Enterprise by contract with SSO, SCIM, approval workflows, exportable audit logs and a 99.99 per cent uptime SLA
- SDKs: The pricing page counts 24+ SDKs for flag evaluation and experiments, among them JavaScript, React, Python, Go, Java, Ruby, PHP, C#, Rust, Swift and Kotlin. None wraps the REST API. @growthbook/mcp had 8,922 npm downloads in the week to 4 October 2026
- Releases: GrowthBook 5.0.0 on 19 July 2026, 5.0.1 on 19 August and 5.1.0 on 21 September. MCP server 2.0.0 on 30 July, 2.1.0 on 10 August and 2.2.0 on 5 October, published to npm on 6 October
- Certifications: SOC 2 Type II, GDPR, COPPA and CCPA per growthbook.io/platform/security. Reports are requested through trust.growthbook.io. Vulnerability reports go to a form or security@growthbook.io, with no cash rewards
- Status: status.growthbook.io on Instatus, three components (GrowthBook Cloud App, Api, CDN). The MCP server is not a listed component
- Sub-processors: List dated 11 May 2026. AWS, MongoDB, ClickHouse, SendGrid, Anthropic and OpenAI in the United States, and Fastly worldwide
- Prices: Pro plan seat $40 per seat per month; CDN requests $0.01 per 1,000 requests; Managed Warehouse event $0. per transaction; CDN bandwidth $1 per GB of traffic

- Scores: Reliability 86, Performance pending, Schema & documentation 76, Agent ergonomics 76, Security & auth 68, Payments & pricing 40, Task success pending, Maintenance & community 89, Transparency & trust 74 · negative events -3 · total over the 7 assessed categories
- Why: Reliability, Graded on GrowthBook Cloud with the hosted lines. · Schema & documentation, Public OpenAPI 3.1 spec, version 5.1.0, with 306 paths and 414 operations, and Zod-typed inputs on all four MCP tools (25). · Agent ergonomics, Four compact MCP tools, with skills loaded on demand and a /mcp/api endpoint that drops the skill tools (25). · Security & auth, OAuth with PKCE, dynamic client registration, refresh tokens and a revocation endpoint for the hosted MCP server. · Payments & pricing, No x402, MPP or L402 (0). · Maintenance & community, MCP server 2.2.0 is dated 5 October 2026 and GrowthBook 5.1.0 was tagged on 21 September 2026 (30). · Transparency & trust, The core and the MCP server are MIT.
- Sources: 25, open questions: 9, both in the full twin
- Capabilities: analytics.experiments, analytics.flags, analytics.query, analytics.events
- JSON: https://www.anchorterminal.com/api/v1/tools/growthbook.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/growthbook.svg` or a link to https://www.anchorterminal.com/tools/growthbook from a page on growthbook.io or one of its subdomains, or the README of github.com/growthbook/growthbook, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

1. Connect to https://mcp.growthbook.io/mcp and complete OAuth in a browser. Use https://mcp.growthbook.io/mcp/api for the two API tools alone
2. Call `growthbook_list_skills` and `growthbook_read_skill` before writing. The API tools don't validate payloads, so use the paths the skill names
3. Stay under 60 requests a minute per key. On 429 wait for the `RateLimit-Reset` seconds before retrying
4. List calls return 10 items by default. Pass `limit` up to 100 and `offset` to page
5. A 422 is a soft warning. Resubmit with `?ignoreWarnings=true` only after reading the message

## Connect

```bash
npx -y @growthbook/mcp@latest
```

```bash
curl https://api.growthbook.io/api/v1/features -H "Authorization: Bearer secret_abc123DEF456"
```

```bash
claude mcp add --transport http growthbook https://mcp.growthbook.io/mcp
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/growthbook

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## Panel reviews (0, desk reviews from public material, no calls made)