update_firmware · Kiln MCP: Risk & Policy

WHAT IT DOES

What update_firmware does on Kiln

AI agents invoke update_firmware 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 update_firmware needs a policy

Firmware updates modify the low-level software running on a physical 3D printer. This is an irreversible or difficult-to-reverse operation that executes a flash/write process on embedded hardware. Misuse could brick the printer or introduce malicious firmware. Classified as Execute (bordering on Destructive) given the potential for permanent hardware damage, but without a description confidence is moderate.

From the tool's definition Tool name 'update_firmware' on a 3D printer control server; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_firmware Rate-limited

update_firmware 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": {
    "update_firmware": {
      "limits": [
        {
          "counter": "update_firmware_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 update_firmware

What does the update_firmware tool do? +

update_firmware. 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 update_firmware? +

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

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

Can I rate-limit update_firmware? +

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

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

update_firmware 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.