compose_assembly_parts · Kiln MCP: Risk & Policy

WHAT IT DOES

What compose_assembly_parts does on Kiln

AI agents use compose_assembly_parts 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 compose_assembly_parts needs a policy

Based on the name alone, 'compose_assembly_parts' likely creates or modifies a 3D model assembly by combining parts together — a Write operation. Confidence is low due to the empty description. It could be Execute if it triggers a physical printer operation, but Write is the most reasonable inference from the name in context of sibling tools like 'add_assembly_part' and 'add_assembly_interface'.

From the tool's definition Tool name 'compose_assembly_parts' suggests combining or creating an assembly from parts; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

compose_assembly_parts Rate-limited

compose_assembly_parts 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": {
    "compose_assembly_parts": {
      "limits": [
        {
          "counter": "compose_assembly_parts_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 compose_assembly_parts

What does the compose_assembly_parts tool do? +

compose_assembly_parts. 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 compose_assembly_parts? +

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

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

Can I rate-limit compose_assembly_parts? +

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

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

compose_assembly_parts 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.