openems_create_patch · Mcp Openems MCP: Risk & Policy

WHAT IT DOES

What openems_create_patch does on Mcp Openems

AI agents use openems_create_patch 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_create_patch needs a policy

This tool creates new electromagnetic design artifacts (patch antenna specifications and calculated dimensions) but does not execute simulations, delete data, or cause external side effects beyond generating reversible design files.

From the tool's definition Tool 'openems_create_patch' creates a design via calculation of antenna dimensions and generates design artifacts (transmission line model output for antenna specifications).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

openems_create_patch Rate-limited

openems_create_patch 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_create_patch": {
      "limits": [
        {
          "counter": "openems_create_patch_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_create_patch

What does the openems_create_patch tool do? +

Design a rectangular microstrip patch antenna. Calculates dimensions using transmission line model for specified frequency and substrate. 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_create_patch? +

Register the Mcp Openems MCP server in PolicyLayer and add a rule for openems_create_patch: 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_create_patch? +

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

Can I rate-limit openems_create_patch? +

Yes. Add a rate_limit block to the openems_create_patch 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_create_patch completely? +

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

openems_create_patch 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.