pause_print · Kiln MCP: Risk & Policy

WHAT IT DOES

What pause_print does on Kiln

AI agents invoke pause_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 pause_print needs a policy

Pausing a 3D print triggers an external physical operation on real hardware. While the description is empty (lowering confidence), the tool name and server context strongly indicate this sends a command to halt an active print job on a 3D printer. This is an Execute-category action — it triggers an external operation whose effects depend on the current state of the printer.

From the tool's definition Tool name 'pause_print' on a server described as 'AI agent control of 3D printers' with tools for OctoPrint, Moonraker, Bambu, Prusa, Elegoo

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pause_print Rate-limited

pause_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": {
    "pause_print": {
      "limits": [
        {
          "counter": "pause_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 pause_print

What does the pause_print tool do? +

pause_print. 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 pause_print? +

Register the Kiln MCP server in PolicyLayer and add a rule for pause_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 pause_print? +

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

Can I rate-limit pause_print? +

Yes. Add a rate_limit block to the pause_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 pause_print completely? +

Set action: deny in the PolicyLayer policy for pause_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 pause_print? +

pause_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.