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fhirHydrant

FHIR MCP server with SMART Backend Services, response compaction, FHIRPath, and guarded writes.

TypeScript

★ 18 stars Last pushed 2026-09-15 License: NOASSERTION

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Review any command before running it. Package names and URLs come from the server's own registry entry.

Package (npm 0.17.3)

npx -y fhirhydrant@0.17.3

Or add to your MCP client config:

{
  "mcpServers": {
    "fhirhydrant": {
      "command": "npx",
      "args": [
        "-y",
        "fhirhydrant@0.17.3"
      ],
      "env": {
        "MCP_TRANSPORT": "<YOUR_VALUE>",
        "FHIR_AUTH": "<YOUR_VALUE>",
        "FHIR_SERVER_URL": "<YOUR_VALUE>",
        "FHIR_TOKEN_URL": "<YOUR_VALUE>",
        "FHIR_CLIENT_ID": "<YOUR_VALUE>",
        "FHIR_ACTIVE_KEY": "<YOUR_VALUE>",
        "FHIR_JWKS_URL": "<YOUR_VALUE>",
        "FHIR_VERSION": "<YOUR_VALUE>"
      }
    }
  }
}

MCP_TRANSPORT required — Run the installed package over MCP stdio.
FHIR_AUTH required — FHIR authentication mode. Use none only for an unauthenticated FHIR endpoint.
FHIR_SERVER_URL required — Full base URL of the FHIR API, such as https://fhir.example.org/fhir/R4.
FHIR_TOKEN_URL — SMART Backend Services token endpoint. Required when FHIR_AUTH=smart unless it can be derived from FHIR_BASE_URL.
FHIR_CLIENT_ID — SMART Backend Services client ID. Required when FHIR_AUTH=smart.
FHIR_ACTIVE_KEY secret — Base64-encoded PKCS#8 private signing key. Required when FHIR_AUTH=smart.
FHIR_JWKS_URL — Externally reachable JWKS URL for the signing key. Recommended for SMART authentication over stdio.
FHIR_VERSION — FHIR release used for FHIRPath and response shaping.