The Unleash MCP Server bridges LLM applications with the Unleash feature flag system via the Model Context Protocol, enabling comprehensive feature flag management:

• Check and retrieve detailed information about feature flags

• Create, update, and archive feature flags in projects

• Enable or disable feature flags in specific environments

• Add, update, delete, and reorder strategies for feature flags

• Mark features as stale or not stale

• Validate feature flag names for availability

• List all feature flags, projects, environments, and feature types

• Manage tags by adding or retrieving them

• Perform batch operations like marking multiple features as stale

• Modify existing flags using standard updates or JSON Patch

Supports the project through donations via Buy Me A Coffee, as mentioned in the 'Support the Project' section with a QR code and link.

Required for running the server, with version 18 or higher specified in the requirements.

Used as the implementation language for the server, with version 5.0 or higher required.

1. Click on "Install Server".

2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.

3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@Unleash MCP (Feature Toggle) check if the new checkout feature is enabled for user ID 12345"

That's it! The server will respond to your query, and you can continue using it as needed.

Here is a step-by-step guide with screenshots.

# Install dependencies
npm i

+----------------+ +-------------------+ +----------------+
| | | | | |
| LLM App | <--> | Unleash MCP | <--> | Unleash API |
| (MCP Client) | | Server | | Server |
| | | | | |
+----------------+ +-------------------+ +----------------+

unleash-mcp-server/
├── src/
│ ├── index.ts # Main entry point
│ ├── server.ts # Server implementation
│ ├── config.ts # Configuration handling
│ ├── transport/ # MCP transport implementations
│ │ ├── http.ts # HTTP/SSE transport
│ │ └── stdio.ts # STDIO transport
│ ├── unleash/ # Unleash API client implementations
│ │ ├── unleash-client.ts # Main Unleash client
│ │ ├── get-feature-flag.ts
│ │ └── get-all-projects.ts
│ ├── resources/ # MCP resource implementations
│ │ ├── flags.ts # Feature flag resources
│ │ └── projects.ts # Project resources
│ ├── tools/ # MCP tool implementations
│ │ ├── get-flag.ts # Get feature flag tool
│ │ └── get-projects.ts # Get projects tool
│ └── prompts/ # MCP prompt implementations
│ ├── flag-check.ts # Check single flag
│ └── batch-flag-check.ts # Check multiple flags
├── tests/ # Tests
└── package.json # Project configuration

# Compile TypeScript
npm run build

# Run the server
npm start

# Run tests
npm test

# MCP stdio inspect
npm run build
npx @modelcontextprotocol/inspector node dist/index.js

# MCP sse inspect
npm start
npx @modelcontextprotocol/inspector

{
 "mcpServers": {
 "unleash": {
 "command": "npx",
 "args": [
 "-y",
 "unleash-mcp"
 ],
 "env": {
 "UNLEASH_URL": "YOUR_UNLEASH_END_POINT",
 "UNLEASH_API_TOKEN": "YOUR_UNLEASH_API_TOKEN",
 "MCP_TRANSPORT": "stdio",
 "MCP_HTTP_PORT": 3001
 }
 }
 }
}