read_fhir_resource

THE RISK

Low Risk

Why read_fhir_resource needs a policy

This tool retrieves a FHIR (Fast Healthcare Interoperability Resources) object by its identifier. The verb 'Get' and absence of any language indicating side effects, mutations, or destructive actions clearly indicates a read-only operation. Even though it accesses healthcare data (potentially sensitive), the tool itself only queries and returns information without modifying state.

From the tool's definition Tool name is 'read_fhir_resource' and description states 'Get a specific FHIR resource by ID' — explicitly a retrieval operation with no modification or deletion.

Documented attack patterns abuse exactly the kind of access read_fhir_resource gives an agent:

POLICY

How to control read_fhir_resource

PolicyLayer is an MCP gateway — it sits between your AI agents and Prometheus MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for read_fhir_resource:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "read_fhir_resource": {}
  }
}

read_fhir_resource is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Prometheus MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about read_fhir_resource

What does the read_fhir_resource tool do? +

Get a specific FHIR resource by ID. It is categorised as a Read tool in the Prometheus MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on read_fhir_resource? +

Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for read_fhir_resource: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Prometheus MCP Server. Nothing to install.

What risk level is read_fhir_resource? +

read_fhir_resource is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit read_fhir_resource? +

Yes. Add a rate_limit block to the read_fhir_resource rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block read_fhir_resource completely? +

Set action: deny in the PolicyLayer policy for read_fhir_resource. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides read_fhir_resource? +

read_fhir_resource is provided by the Prometheus MCP Server MCP server (awslabs.prometheus-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Prometheus MCP Server tool call.

Start from Prometheus MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →