openems_generate_script · Mcp Openems MCP: Risk & Policy

WHAT IT DOES

What openems_generate_script does on Mcp Openems

AI agents use openems_generate_script to create or update resources in Mcp Openems — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Openems environment.

WHY IT NEEDS A POLICY

Why openems_generate_script needs a policy

This tool generates (creates/writes) a Python script file to disk. It does not execute the script itself — the description notes 'The script can be run independently,' implying the tool only produces the file. This is a Write action (creating a file). Since the script is not executed by this tool, it doesn't qualify as Execute.

From the tool's definition Generate a complete OpenEMS Python simulation script for a design. The script can be run independently.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

openems_generate_script Rate-limited

openems_generate_script 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": {
    "openems_generate_script": {
      "limits": [
        {
          "counter": "openems_generate_script_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 Mcp Openems, so you can run agents against it safely.

FAQ

Questions about openems_generate_script

What does the openems_generate_script tool do? +

Generate a complete OpenEMS Python simulation script for a design. The script can be run independently. It is categorised as a Write tool in the Mcp Openems MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on openems_generate_script? +

Register the Mcp Openems MCP server in PolicyLayer and add a rule for openems_generate_script: 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 Mcp Openems. Nothing to install.

What risk level is openems_generate_script? +

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

Can I rate-limit openems_generate_script? +

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

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

openems_generate_script is provided by the Mcp Openems MCP server (rfingadam/mcp-openems). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.