AI agents call openemr_vital_trends to retrieve information from Openemr without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves existing patient health data without creating, modifying, deleting, or executing any operations. It is a query/fetch operation that reads longitudinal records, which is the definition of a Read category tool.
From the tool's definition Tool name 'openemr_vital_trends' and description 'Return longitudinal vital sign trajectories for a patient' indicate data retrieval with no modification or deletion. The action is to fetch and display historical vital sign measurements (weight, BP).
Attacks that exploit this kind of access
Return longitudinal vital sign trajectories for a patient (weight, BP systolic/diastolic). It is categorised as a Read tool in the Openemr MCP Server, which means it retrieves data without modifying state.
Register the Openemr MCP server in PolicyLayer and add a rule for openemr_vital_trends: 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 Openemr. Nothing to install.
openemr_vital_trends 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 openemr_vital_trends 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 openemr_vital_trends. 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.
openemr_vital_trends is provided by the Openemr MCP server (shruti-jn/openemr-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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