updateWorkout · Hevy MCP Server MCP: Risk & Policy

WHAT IT DOES

What updateWorkout does on Hevy MCP Server

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

WHY IT NEEDS A POLICY

Why updateWorkout needs a policy

This tool modifies workout data reversibly (workouts can be edited again or reverted), which is characteristic of Write category operations. The severity is medium because misuse could alter user fitness records, but the changes are not destructive and can be corrected. The confidence is high given the clear naming and description indicating a data modification operation.

From the tool's definition Tool name 'updateWorkout' combined with description 'Update an existing workout' indicates modification of existing data in the fitness platform.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

updateWorkout Rate-limited

updateWorkout 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": {
    "updateWorkout": {
      "limits": [
        {
          "counter": "updateworkout_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 MCP Server, so you can run agents against it safely.

FAQ

Questions about updateWorkout

What does the updateWorkout tool do? +

Update an existing workout. It is categorised as a Write tool in the Hevy MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on updateWorkout? +

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

What risk level is updateWorkout? +

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

Can I rate-limit updateWorkout? +

Yes. Add a rate_limit block to the updateWorkout 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 updateWorkout completely? +

Set action: deny in the PolicyLayer policy for updateWorkout. 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 updateWorkout? +

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