OpenFGA MCP server

OpenFGA MCP Server is an experimental Model Context Protocol (MCP) server that enables Large Language Models to read, search, and manipulate OpenFGA stores. It unlocks authorization capabilities for agentic AI and fine-grained access control management through a standardized protocol interface.

Requirements

• Python 3.12+
• An OpenFGA server

Installation

Using UVX (Recommended)

The simplest way to run the server is using UVX:

uvx openfga-mcp@latest

Installing via Smithery

To install OpenFGA MCP Server for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @evansims/openfga-mcp --client claude

Configuration

The server accepts the following arguments:

• --openfga_url: URL of your OpenFGA server
• --openfga_store: ID of the OpenFGA store the MCP server will use
• --openfga_model: ID of the OpenFGA authorization model the MCP server will use

Authentication Options

For API token authentication:

• --openfga_token: API token for use with your OpenFGA server

For Client Credentials authentication:

• --openfga_client_id: Client ID for use with your OpenFGA server
• --openfga_client_secret: Client secret for use with your OpenFGA server
• --openfga_api_issuer: API issuer for use with your OpenFGA server
• --openfga_api_audience: API audience for use with your OpenFGA server

Example Configuration

uvx openfga-mcp@latest \
  --openfga_url="http://127.0.0.1:8080" \
  --openfga_store="your-store-id" \
  --openfga_model="your-model-id"

Integration with LLM Clients

Using with Claude Desktop

To configure Claude to use the server, add the following to your Claude config:

{
  "mcpServers": {
    "openfga-mcp": {
      "command": "uvx",
      "args": ["openfga-mcp@latest"]
    }
  }
}

Note:

• You may need to specify the full path to your uvx executable. Use which uvx to find it.
• You must restart Claude after updating the configuration.

Features and Capabilities

Store Management

• Create, list, get, and delete stores
• Retrieve store IDs by name

Authorization Model Management

• Write authorization models
• List all authorization models
• Get specific authorization model details

Relationship Management

• Write relation tuples
• Read relation tuples

Authorization Queries

• Check if a user has a relation to an object
• List objects of a type that a user has a relation to
• List users that have a given relationship with a specific object

How to add this MCP server to Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > MCP and click "Add new global MCP server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "cursor-rules-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "cursor-rules-mcp"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explictly ask the agent to use the tool by mentioning the tool name and describing what the function does.