await_print_completion · Kiln MCP: Risk & Policy

WHAT IT DOES

What await_print_completion does on Kiln

AI agents invoke await_print_completion 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 await_print_completion needs a policy

Given the server context (AI control of 3D printers) and the name, this tool likely waits/blocks until a print job finishes — a monitoring/execution operation that interacts with external hardware. No description is provided, so confidence is low. The most plausible category is Execute since it involves triggering or waiting on an external operation (the printer), rather than purely reading data or writing config.

From the tool's definition Tool name 'await_print_completion' on a 3D printer control server; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

await_print_completion Rate-limited

await_print_completion 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": {
    "await_print_completion": {
      "limits": [
        {
          "counter": "await_print_completion_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 await_print_completion

What does the await_print_completion tool do? +

await_print_completion. 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 await_print_completion? +

Register the Kiln MCP server in PolicyLayer and add a rule for await_print_completion: 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 await_print_completion? +

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

Can I rate-limit await_print_completion? +

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

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

await_print_completion 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.