nec2_simulate · Mcp Nec2 Antenna MCP: Risk & Policy

WHAT IT DOES

What nec2_simulate does on Mcp Nec2 Antenna

AI agents invoke nec2_simulate to trigger actions in Mcp Nec2 Antenna. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why nec2_simulate needs a policy

This tool executes external code (the NEC2 electromagnetic simulation engine) and produces computed results based on input parameters. It is Execute rather than Read because it runs a simulator with side effects (resource consumption, computation) rather than merely querying stored data.

From the tool's definition Tool performs 'Run NEC2 simulation' which triggers external computational operations (the NEC2 method-of-moments solver) whose effects depend on antenna configuration arguments passed to it.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

nec2_simulate Rate-limited

nec2_simulate stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "nec2_simulate": {
      "limits": [
        {
          "counter": "nec2_simulate_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 Nec2 Antenna, so you can run agents against it safely.

FAQ

Questions about nec2_simulate

What does the nec2_simulate tool do? +

Run NEC2 simulation on an antenna to get impedance and radiation pattern. It is categorised as a Execute tool in the Mcp Nec2 Antenna MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on nec2_simulate? +

Register the Mcp Nec2 Antenna MCP server in PolicyLayer and add a rule for nec2_simulate: 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 Nec2 Antenna. Nothing to install.

What risk level is nec2_simulate? +

nec2_simulate is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit nec2_simulate? +

Yes. Add a rate_limit block to the nec2_simulate 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 nec2_simulate completely? +

Set action: deny in the PolicyLayer policy for nec2_simulate. 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 nec2_simulate? +

nec2_simulate is provided by the Mcp Nec2 Antenna MCP server (rfingadam/mcp-nec2-antenna). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.