Find similar patients using age, gender, and condition codes from map_to_fhir_codes_fast output
AI agents call find_similar_patients_simple to retrieve information from FHIR Careplan without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries existing patient information to locate similar cases—a classic Read operation. It performs no side effects, does not create, modify, or delete data, and does not execute arbitrary code or move money. Severity is low because the data returned would typically be de-identified search results used for clinical decision support, with limited blast radius if misused.
From the tool's definition Tool description states 'Find similar patients' which retrieves or queries patient data to identify matches based on demographic and clinical parameters (age, gender, condition codes).
Attacks that exploit this kind of access
Find similar patients using age, gender, and condition codes from map_to_fhir_codes_fast output. It is categorised as a Read tool in the FHIR Careplan MCP Server, which means it retrieves data without modifying state.
Register the FHIR Careplan MCP server in PolicyLayer and add a rule for find_similar_patients_simple: 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 Careplan. Nothing to install.
find_similar_patients_simple 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 find_similar_patients_simple 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 find_similar_patients_simple. 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.
find_similar_patients_simple is provided by the FHIR Careplan MCP server (kushagra-dutta/fhir-mcp). 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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