import_step_file · Kiln MCP: Risk & Policy

WHAT IT DOES

What import_step_file does on Kiln

AI agents use import_step_file 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 import_step_file needs a policy

The tool creates/modifies the active design or job queue on the 3D printer system by loading external STEP geometry. This is a Write operation—it reversibly adds data to the printer's workflow. It's not Execute (doesn't directly trigger printing), Destructive (reversible), or Financial.

From the tool's definition Tool name 'import_step_file' indicates importing a 3D model file (STEP format) into a 3D printer control system. The sibling context shows tools that modify printer state and design data (add_mesh_chamfer, add_mesh_fillet, add_assembly_part, add_spool).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

import_step_file Rate-limited

import_step_file 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": {
    "import_step_file": {
      "limits": [
        {
          "counter": "import_step_file_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 import_step_file

What does the import_step_file tool do? +

import_step_file. 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 import_step_file? +

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

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

Can I rate-limit import_step_file? +

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

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

import_step_file 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.