@flexpa/mcp-fhir

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

• 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

Related MCP server: Myrcael

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.