acquire_printer_lock · Kiln MCP: Risk & Policy

WHAT IT DOES

What acquire_printer_lock does on Kiln

AI agents invoke acquire_printer_lock 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 acquire_printer_lock needs a policy

Based on the name alone, 'acquire_printer_lock' likely triggers an external operation on a physical 3D printer — locking or reserving the printer resource for exclusive access. This implies an Execute-level action that affects physical hardware operations. However, the description is empty, so confidence is low.

From the tool's definition Tool name: 'acquire_printer_lock'; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

acquire_printer_lock Rate-limited

acquire_printer_lock 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": {
    "acquire_printer_lock": {
      "limits": [
        {
          "counter": "acquire_printer_lock_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 acquire_printer_lock

What does the acquire_printer_lock tool do? +

acquire_printer_lock. 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 acquire_printer_lock? +

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

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

Can I rate-limit acquire_printer_lock? +

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

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

acquire_printer_lock 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.