create_body_measurement · Hevy MCP: Risk & Policy

WHAT IT DOES

What create_body_measurement does on Hevy

AI agents use create_body_measurement to create or update resources in Hevy — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Hevy environment.

WHY IT NEEDS A POLICY

Why create_body_measurement needs a policy

This tool creates a new body measurement entry in the Hevy fitness app. Creating data is a Write operation—it modifies application state but is reversible (measurements can be edited or deleted). There is no irreversible deletion, code execution, or financial impact. The blast radius is minimal since fitness tracking data is personal and non-critical.

From the tool's definition Tool name 'create_body_measurement' and description 'Create a body measurement entry' indicate this creates a new data record that can be modified or deleted later.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_body_measurement Rate-limited

create_body_measurement stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_body_measurement": {
      "limits": [
        {
          "counter": "create_body_measurement_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Hevy, so you can run agents against it safely.

FAQ

Questions about create_body_measurement

What does the create_body_measurement tool do? +

Create a body measurement entry for a date (YYYY-MM-DD). It is categorised as a Write tool in the Hevy MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_body_measurement? +

Register the Hevy MCP server in PolicyLayer and add a rule for create_body_measurement: 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 Hevy. Nothing to install.

What risk level is create_body_measurement? +

create_body_measurement is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_body_measurement? +

Yes. Add a rate_limit block to the create_body_measurement 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.

How do I block create_body_measurement completely? +

Set action: deny in the PolicyLayer policy for create_body_measurement. 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.

What MCP server provides create_body_measurement? +

create_body_measurement is provided by the Hevy MCP server (srdjancodes/hevy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.