@flexpa/mcp-fhir

[!WARNING] This is an experimental demo not intended for production use.

This is a TypeScript-based MCP server that connects to a FHIR server. It provides core MCP functionality for interacting with FHIR resources by:

• Accessing FHIR resources via URIs
• Providing search capabilities for FHIR resources

Features

Resources

[!TIP] “Resources” here refers to the MCP definition not the FHIR one. MCP Resources are a core primitive in the Model Context Protocol (MCP) that allow servers to expose data and content that can be read by clients and used as context for LLM interactions.

• List and access FHIR resources via fhir:// URIs
• Resources are returned in FHIR JSON format
• Supports all FHIR Resource types available in the FHIR server’s CapabilityStatement

Tools

• search_fhir - Search FHIR resources
  • Takes resourceType and searchParams as parameters
  • Returns FHIR search results
• read_fhir - Read an individual FHIR resource
  • Takes uri as a parameter
  • Returns the FHIR resource in JSON format

Configuration

The server requires the following environment variables:

• FHIR_BASE_URL: The base URL of your FHIR server
• FHIR_ACCESS_TOKEN: A SMART on FHIR access token for authentication

Development

Install dependencies:

npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Installation

To use with Claude Desktop, add the server config:

On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "fhir": {
      "command": "/path/to/@flexpa/mcp-fhir/build/index.js"
    },
    "env": {
      "FHIR_BASE_URL": "<FHIR_BASE_URL>",
      "FHIR_ACCESS_TOKEN": "<FHIR_ACCESS_TOKEN>"
    }
  }
}

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector, which is available as a package script:

npm run inspector

The Inspector will provide a URL to access debugging tools in your browser.