Retrieve allergies for a specific patient.
AI agents call get_patient_allergies to retrieve information from FHIR MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves healthcare data (allergy information) from a FHIR API without any side effects. It performs a read-only query of existing patient records. While the data is sensitive (healthcare/PHI), the tool itself has no destructive or operational capability.
From the tool's definition Tool name 'get_patient_allergies' and description 'Retrieve allergies for a specific patient' indicate a data retrieval operation with no modification, creation, deletion, code execution, or financial impact.
Attacks that exploit this kind of access
Retrieve allergies for a specific patient. It is categorised as a Read tool in the FHIR MCP Server MCP Server, which means it retrieves data without modifying state.
Register the FHIR MCP Server MCP server in PolicyLayer and add a rule for get_patient_allergies: 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 FHIR MCP Server. Nothing to install.
get_patient_allergies is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_patient_allergies 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.
Set action: deny in the PolicyLayer policy for get_patient_allergies. 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.
get_patient_allergies is provided by the FHIR MCP Server MCP server (sdesani/mcp-fhir). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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