FHIR MCP server with SMART Backend Services, response compaction, FHIRPath, and guarded writes.
To add fhirhydrant to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It needs 8 environment variables, listed below.
Install
npx -y fhirhydrant@0.17.3Environment variables
MCP_TRANSPORTSet in your MCP configFHIR_AUTHSet in your MCP configFHIR_SERVER_URLSet in your MCP configFHIR_TOKEN_URLSet in your MCP configFHIR_CLIENT_IDSet in your MCP configFHIR_ACTIVE_KEYSet in your MCP configFHIR_JWKS_URLSet in your MCP configFHIR_VERSIONSet in your MCP configInstall with your client
claude mcp add fhirhydrant --env MCP_TRANSPORT=<YOUR_MCP_TRANSPORT> --env FHIR_AUTH=<YOUR_FHIR_AUTH> --env FHIR_SERVER_URL=<YOUR_FHIR_SERVER_URL> --env FHIR_TOKEN_URL=<YOUR_FHIR_TOKEN_URL> --env FHIR_CLIENT_ID=<YOUR_FHIR_CLIENT_ID> --env FHIR_ACTIVE_KEY=<YOUR_FHIR_ACTIVE_KEY> --env FHIR_JWKS_URL=<YOUR_FHIR_JWKS_URL> --env FHIR_VERSION=<YOUR_FHIR_VERSION> -- npx -y fhirhydrant@0.17.3
Run this in a terminal to add the server to Claude Code.
What this does
fhirhydrant exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server needs the following environment variables to be set before it can run:
MCP_TRANSPORT FHIR_AUTH FHIR_SERVER_URL FHIR_TOKEN_URL FHIR_CLIENT_ID FHIR_ACTIVE_KEY FHIR_JWKS_URL FHIR_VERSION
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install fhirhydrant?
Run the Claude Code command in the install section to add fhirhydrant to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with fhirhydrant?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to fhirhydrant as well.
Does fhirhydrant need an API key?
Yes. Before it can run, set these environment variables: MCP_TRANSPORT, FHIR_AUTH, FHIR_SERVER_URL, FHIR_TOKEN_URL, FHIR_CLIENT_ID, FHIR_ACTIVE_KEY, FHIR_JWKS_URL, FHIR_VERSION. They go in the env block of your MCP config.
Imported from the Official MCP Registry. The details above come from the registry entry; the maker can claim this listing to correct them, add docs, and see its traffic.
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