Calculate Mean Arterial Pressure
AI agents call bp_calculate_map to retrieve information from Blood Pressure Tool without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a mathematical calculation (Mean Arterial Pressure = diastolic + 1/3 * pulse pressure) based on input values. It neither reads from nor writes to any data store, and has no side effects. It is a pure computation, closest to a Read/query operation. Severity is low as misuse would only result in an incorrect calculation being returned.
From the tool's definition Calculate Mean Arterial Pressure — purely a calculation/derivation of a value (MAP) from existing data with no side effects
Attacks that exploit this kind of access
Calculate Mean Arterial Pressure. It is categorised as a Read tool in the Blood Pressure Tool MCP Server, which means it retrieves data without modifying state.
Register the Blood Pressure Tool MCP server in PolicyLayer and add a rule for bp_calculate_map: 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 Blood Pressure Tool. Nothing to install.
bp_calculate_map 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 bp_calculate_map 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 bp_calculate_map. 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.
bp_calculate_map is provided by the Blood Pressure Tool MCP server (mclarkson/bptool). 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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