openems_create_helix · Mcp Openems MCP: Risk & Policy

WHAT IT DOES

What openems_create_helix does on Mcp Openems

AI agents use openems_create_helix 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_helix needs a policy

This tool creates a helical antenna design, analogous to other 'openems_create_*' tools on this server that generate electromagnetic structure definitions or simulation scripts. It produces a new artifact (design/script) without executing simulations or deleting data, placing it in the Write category.

From the tool's definition "Design an axial-mode helical antenna for circular polarization" — creates/generates a design artifact (antenna structure/script)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

openems_create_helix Rate-limited

openems_create_helix 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_helix": {
      "limits": [
        {
          "counter": "openems_create_helix_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_helix

What does the openems_create_helix tool do? +

Design an axial-mode helical antenna for circular polarization. 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_helix? +

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

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

Can I rate-limit openems_create_helix? +

Yes. Add a rate_limit block to the openems_create_helix 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_helix completely? +

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

openems_create_helix 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.