Get healthcare encounters/visits for a patient
AI agents call get_patient_encounters to retrieve information from Agent Care MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical healthcare encounter data from an EMR system (Cerner/Epic via FHIR). While the action itself is read-only with no side effects, the severity is elevated to 'high' because patient healthcare data is sensitive protected health information (PHI) under HIPAA; unauthorized access or disclosure could cause significant harm to patient privacy and safety.
From the tool's definition Tool name 'get_patient_encounters' and description 'Get healthcare encounters/visits for a patient' indicate data retrieval only. The verb 'Get' and context of querying patient visit history show no modification, deletion, or execution of external operations.
Attacks that exploit this kind of access
Get healthcare encounters/visits for a patient. It is categorised as a Read tool in the Agent Care MCP MCP Server, which means it retrieves data without modifying state.
Register the Agent Care MCP server in PolicyLayer and add a rule for get_patient_encounters: 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 Agent Care MCP. Nothing to install.
get_patient_encounters 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_encounters 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_encounters. 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_encounters is provided by the Agent Care MCP server (polya20/agentcare-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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