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OpenFeature MCP Server

Archived: MIGRATED TO OPENFEATURE ORG

OpenFeature MCP Local Server (stdio)

Warning

This project is in active development.

Features

A local Model Context Protocol (MCP) server that provides OpenFeature SDK installation guidance and Open Feature Remote Evaluation Protocol (OFREP) over stdio.

  • OpenFeature SDK Installation Guides: Fetch installation prompts for various OpenFeature SDKs

  • MCP stdio Transport: Intended for local usage by MCP-compatible clients

Configure your AI client (local)

Cursor

Add to ~/.cursor/mcp_settings.json:

{ "mcpServers": { "OpenFeature": { "command": "npx", "args": ["-y", "@openfeature/mcp"] } } }

VS Code (Continue)

Add to .continue/config.json:

{ "mcpServers": { "OpenFeature": { "command": "npx", "args": ["-y", "@openfeature/mcp"] } } }

Claude Code (CLI)

Add the server via CLI:

claude mcp add --transport stdio openfeature npx -y @openfeature/mcp

Then manage the connection in the CLI with /mcp.

Windsurf

In the "Manage MCP servers" raw config, add:

{ "mcpServers": { "OpenFeature": { "command": "npx", "args": ["-y", "@openfeature/mcp"] } } }

Claude Desktop

Edit your Claude Desktop config and add:

{ "mcpServers": { "openfeature": { "command": "npx", "args": ["-y", "@openfeature/mcp"] } } }

Restart Claude Desktop after saving.

NPM Global install (optional)

If you prefer a global install instead of NPX:

npm install -g @openfeature/mcp

Now in your MCP config use openfeature-mcp as the command:

{ "mcpServers": { "openfeature": { "command": "openfeature-mcp" } } }

All logs are written to stderr. The MCP protocol messages use stdout.

Available Tools

install_openfeature_sdk

Fetches Markdown instructions for installing the OpenFeature SDK for a given technology. Optionally augments the prompt with installation guidance for one or more feature flag providers.

Parameters:

  • technology (string enum): One of the supported technologies listed below

  • providers (string array, optional): Zero or more provider identifiers. If present, adds provider-specific installation notes to the prompt (or removes placeholder sections when empty).

Supported Technologies:

The technologies list is build from the avaliable prompts/*.md, updated automatically using scripts/build-prompts.js

  • android

  • dotnet

  • go

  • ios

  • java

  • javascript

  • nestjs

  • nodejs

  • php

  • python

  • react

  • ruby

Supported Providers:

The provider list is sourced automatically from the OpenFeature open-feature/openfeature.dev repo; newly added providers there become available here without manual edits. See scripts/build-providers.js for details.

ofrep_flag_eval

Evaluate feature flags via OpenFeature Remote Evaluation Protocol (OFREP). If flag_key is omitted, performs bulk evaluation.

References: open-feature/protocol, OFREP OpenAPI spec

Parameters (all optional unless noted):

  • base_url (string, optional): Base URL of your OFREP-compatible flag service. If omitted, the server uses env/config (see below).

  • flag_key (string, optional): If provided, calls single flag evaluation: /ofrep/v1/evaluate/flags/{key}. If omitted, calls bulk: /ofrep/v1/evaluate/flags.

  • context (object, optional): Evaluation context, e.g. { "targetingKey": "user-123", ... }.

  • etag (string, optional): For bulk requests, sent as If-None-Match to enable 304 caching semantics.

  • auth (object, optional): Inline auth for this call only.

    • bearer_token (string, optional): Sets Authorization: Bearer <token>.

    • api_key (string, optional): Sets X-API-Key: <key>.

Auth and base URL resolution (priority):

  1. Tool call args: base_url, auth.bearer_token, auth.api_key

  2. Environment variables: OPENFEATURE_OFREP_BASE_URL (or OFREP_BASE_URL), OPENFEATURE_OFREP_BEARER_TOKEN (or OFREP_BEARER_TOKEN), OPENFEATURE_OFREP_API_KEY (or OFREP_API_KEY)

  3. Config file: ~/.openfeature-mcp.json (override with OPENFEATURE_MCP_CONFIG_PATH)

Example ~/.openfeature-mcp.json:

{ "OFREP": { "baseUrl": "https://flags.example.com", "bearerToken": "<token>", "apiKey": "<key>" } }

Notes:

  • Bulk requests may return ETag. Pass it back via etag to leverage 304 Not Modified.

  • Either bearer token or API key can be supplied; both are supported by the spec.

Development

Prerequisites

  • Node.js 18+

Setup

  1. Install dependencies:

    npm install
  2. Add or edit install guides in the prompts/ folder (Markdown). These are bundled at build time.

  3. Build prompts bundle:

    npm run build-prompts
  4. Build TypeScript:

    npm run build
  5. Run locally (binary entrypoint):

    node dist/cli.js
Deploy Server
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license - permissive license
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remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

Provides OpenFeature SDK installation guidance through MCP tool calls. Enables AI clients to fetch installation prompts and setup instructions for various OpenFeature SDKs across different programming languages and frameworks.

  1. OpenFeature MCP Local Server (stdio)
    1. Warning
    2. Features
    3. Configure your AI client (local)
    4. NPM Global install (optional)
    5. Available Tools
    6. Development

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