build_material_overrides · Kiln MCP: Risk & Policy

WHAT IT DOES

What build_material_overrides does on Kiln

AI agents use build_material_overrides 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 build_material_overrides needs a policy

The name implies constructing/writing material override configurations for a 3D printer, likely a Write operation. However, with no description available, confidence is low. Severity is medium since misconfigured material settings could affect print quality or hardware, but is generally reversible.

From the tool's definition Tool name 'build_material_overrides' suggests creating or modifying material override settings; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

build_material_overrides Rate-limited

build_material_overrides 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": {
    "build_material_overrides": {
      "limits": [
        {
          "counter": "build_material_overrides_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 build_material_overrides

What does the build_material_overrides tool do? +

build_material_overrides. 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 build_material_overrides? +

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

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

Can I rate-limit build_material_overrides? +

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

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

build_material_overrides 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.