register_printer · Kiln MCP: Risk & Policy

WHAT IT DOES

What register_printer does on Kiln

AI agents use register_printer 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 register_printer needs a policy

Registration typically creates or modifies a configuration entry for a device, making this a Write operation rather than Read (no query) or Destructive (reversible). Severity is medium because unauthorized registration could allow an agent to add rogue printers to a system, potentially enabling unauthorized manufacturing or resource hijacking, but the impact is constrained to device inventory rather than financial…

From the tool's definition Tool name 'register_printer' indicates creation or enrollment of a printer resource in the system. Description is empty, limiting certainty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

register_printer Rate-limited

register_printer 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": {
    "register_printer": {
      "limits": [
        {
          "counter": "register_printer_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 register_printer

What does the register_printer tool do? +

register_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 register_printer? +

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

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

Can I rate-limit register_printer? +

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

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

register_printer 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.