stop_watch_print · Kiln MCP: Risk & Policy

WHAT IT DOES

What stop_watch_print does on Kiln

AI agents invoke stop_watch_print to trigger actions in Kiln. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why stop_watch_print needs a policy

This tool terminates an active background process that monitors/controls a 3D printer. While not strictly destructive (the print itself may continue), stopping a print watcher is an Execute action because it triggers termination of an external operation with real-world side effects (loss of monitoring/control of an active print).

From the tool's definition Tool name 'stop_watch_print' combined with context of 3D printer control (OctoPrint, Moonraker, Bambu, Prusa, Elegoo) indicates stopping an active monitoring/control process.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stop_watch_print Rate-limited

stop_watch_print stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "stop_watch_print": {
      "limits": [
        {
          "counter": "stop_watch_print_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about stop_watch_print

What does the stop_watch_print tool do? +

Stop a background print watcher and return its final state. It is categorised as a Execute tool in the Kiln MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on stop_watch_print? +

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

What risk level is stop_watch_print? +

stop_watch_print is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit stop_watch_print? +

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

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

stop_watch_print is provided by the Kiln MCP server (codeofaxel/Kiln). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.