add_assembly_part · Kiln MCP: Risk & Policy

WHAT IT DOES

What add_assembly_part does on Kiln

AI agents use add_assembly_part 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 add_assembly_part needs a policy

The name implies adding/creating a part within an assembly context (Write). No description is available to confirm destructive or execute behavior. Given the server context of 3D printer control, this likely modifies an assembly model. Confidence is low due to empty description.

From the tool's definition Tool name 'add_assembly_part' suggests creating or adding a part to an assembly, which is a write operation. Description is empty, lowering confidence.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_assembly_part Rate-limited

add_assembly_part 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": {
    "add_assembly_part": {
      "limits": [
        {
          "counter": "add_assembly_part_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 add_assembly_part

What does the add_assembly_part tool do? +

add_assembly_part. 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 add_assembly_part? +

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

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

Can I rate-limit add_assembly_part? +

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

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

add_assembly_part 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.