OpenFeature MCP Server

OpenFeature MCP Cloudflare Worker

Warning

This project is in active development and intended for testing only. APIs, prompts, and behavior may change without notice. Do not use in production.

A simplified Model Context Protocol (MCP) server running on Cloudflare Workers that provides OpenFeature SDK installation guidance.

Features

No Authentication Required: Simplified implementation without OAuth or user management
OpenFeature SDK Installation Guides: Fetch installation prompts for various OpenFeature SDKs
MCP Protocol Support: Supports both SSE and JSON-RPC transports
Cloudflare Workers: Serverless deployment with global edge distribution

Configure your AI client

Use the hosted endpoint for this OpenFeature MCP worker: https://mcp-openfeature.devcycle.com/mcp

No authentication is required for this MCP.

Cursor

Add to ~/.cursor/mcp_settings.json:

{
  "mcpServers": {
    "OpenFeature": {
      "url": "https://mcp-openfeature.devcycle.com/mcp"
    }
  }
}

VS Code (Continue)

Add to .continue/config.json:

{
  "mcpServers": {
    "OpenFeature": {
      "url": "https://mcp-openfeature.devcycle.com/mcp"
    }
  }
}

Claude Code (CLI)

claude mcp add --transport http openfeature https://mcp-openfeature.devcycle.com/mcp

Then manage the connection in the CLI with /mcp.

Claude Desktop

Edit your Claude Desktop config and add:

{
  "mcpServers": {
    "openfeature": {
      "command": "npx",
      "args": ["mcp-remote", "https://mcp-openfeature.devcycle.com/mcp"]
    }
  }
}

Restart Claude Desktop after saving.

Windsurf

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

{
  "mcpServers": {
    "OpenFeature": {
      "serverUrl": "https://mcp-openfeature.devcycle.com/mcp"
    }
  }
}

Reference installation patterns adapted from the DevCycle MCP getting started guide DevCycle MCP Getting Started.

Available Tools

`install_openfeature_sdk`

Fetches and returns OpenFeature SDK install prompt Markdown for a given guide from the bundled prompts.

Parameters:

guide (string enum): One of the supported guides listed below

Supported Guides (bundled):

android
dotnet
go
ios
java
javascript
nestjs
nodejs
php
python
react
ruby

Endpoints

/mcp - MCP JSON-RPC transport endpoint
/sse - MCP Server-Sent Events transport endpoint
/health - Health check endpoint
/info - Service information endpoint
/ - Redirects to OpenFeature documentation

Development

Prerequisites

Node.js 18+
Yarn (using regular node_modules, not PnP)
Wrangler CLI

Setup

Install dependencies:
yarn install
Add or edit install guides in the prompts/ folder (Markdown). These are bundled at build time.
Build prompts bundle:
yarn build-prompts
Run locally:
yarn dev
Build for production:
yarn build

Deployment

Deploy to Cloudflare Workers:

yarn deploy

Usage

The worker exposes MCP transport endpoints and simple health/info endpoints.

Examples

Health:
curl http://localhost:8787/health
Info:
curl http://localhost:8787/info
MCP over HTTP (JSON-RPC) or SSE: Point your MCP-compatible client to /mcp (JSON-RPC) or /sse (SSE). The tool name is install_openfeature_sdk and requires an input object like { "guide": "react" }.

Architecture

This is a simplified version of the DevCycle MCP worker, with all authentication and project management features removed. It focuses solely on providing OpenFeature SDK installation guidance through MCP tool calls.

Install Server

HTTP connection URL

security - not tested

license - permissive license

quality - not tested

How are these scores calculated?

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.

Tools

install_openfeature_sdk

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.

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