release_printer_lock · Kiln MCP: Risk & Policy

WHAT IT DOES

What release_printer_lock does on Kiln

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

WHY IT NEEDS A POLICY

Why release_printer_lock needs a policy

This tool modifies printer state (lock status) in a reversible manner — acquiring or releasing locks can be toggled. It does not delete data or trigger printing operations, so it is Write rather than Execute or Destructive.

From the tool's definition release_printer_lock releases an exclusive lock on a printer, modifying its lock state. The description confirms this is a lock state modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

release_printer_lock Rate-limited

release_printer_lock 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": {
    "release_printer_lock": {
      "limits": [
        {
          "counter": "release_printer_lock_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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 release_printer_lock

What does the release_printer_lock tool do? +

Release an exclusive lock on a printer. It is categorised as a Write tool in the Kiln MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on release_printer_lock? +

Register the Kiln MCP server in PolicyLayer and add a rule for release_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 release_printer_lock? +

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

Can I rate-limit release_printer_lock? +

Yes. Add a rate_limit block to the release_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 release_printer_lock completely? +

Set action: deny in the PolicyLayer policy for release_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 release_printer_lock? +

release_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.