schedule_workout · Garmin MCP: Risk & Policy

WHAT IT DOES

What schedule_workout does on Garmin

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

WHY IT NEEDS A POLICY

Why schedule_workout needs a policy

Scheduling a workout creates or modifies calendar data (a scheduled workout entry) reversibly—users can unschedule or reschedule workouts. This is a Write operation rather than Execute because it doesn't run arbitrary code or trigger external operations with unpredictable effects; it updates a structured calendar entry.

From the tool's definition Tool description states 'Schedule an existing workout on the Garmin calendar', which modifies calendar state by adding a scheduled workout entry.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

schedule_workout Rate-limited

schedule_workout 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": {
    "schedule_workout": {
      "limits": [
        {
          "counter": "schedule_workout_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about schedule_workout

What does the schedule_workout tool do? +

Schedule an existing workout on the Garmin calendar (YYYY-MM-DD). It is categorised as a Write tool in the Garmin MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on schedule_workout? +

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

What risk level is schedule_workout? +

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

Can I rate-limit schedule_workout? +

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

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

schedule_workout is provided by the Garmin MCP server (marcelohensantos/garmin-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.