validate_gcode · Kiln MCP: Risk & Policy

WHAT IT DOES

What validate_gcode does on Kiln

AI agents invoke validate_gcode 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 validate_gcode needs a policy

GCode validation on a 3D printer control platform likely involves parsing or executing GCode instructions to check their validity, which could trigger printer movements or operations. Even if it only reads/parses GCode, the context of a printer control server with 273 tools and the ability to send commands makes Execute the most likely category.

From the tool's definition Tool name 'validate_gcode' on a 3D printer control server (OctoPrint, Moonraker, Bambu, Prusa, Elegoo). Description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

validate_gcode Rate-limited

validate_gcode 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": {
    "validate_gcode": {
      "limits": [
        {
          "counter": "validate_gcode_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 validate_gcode

What does the validate_gcode tool do? +

validate_gcode. 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 validate_gcode? +

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

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

Can I rate-limit validate_gcode? +

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

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

validate_gcode 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.