set_printer_light · Kiln MCP: Risk & Policy

WHAT IT DOES

What set_printer_light does on Kiln

AI agents use set_printer_light 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 set_printer_light needs a policy

The name implies a write operation (setting/changing the light on/off or brightness on a 3D printer). This is a reversible state change. Empty description lowers confidence. Severity is medium because misuse could affect printer operation, but controlling a light is generally low-impact — medium accounts for uncertainty given the broad server context.

From the tool's definition Tool name 'set_printer_light' suggests modifying the light state of a 3D printer; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_printer_light Rate-limited

set_printer_light 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": {
    "set_printer_light": {
      "limits": [
        {
          "counter": "set_printer_light_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 set_printer_light

What does the set_printer_light tool do? +

set_printer_light. 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 set_printer_light? +

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

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

Can I rate-limit set_printer_light? +

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

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

set_printer_light 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.