vna_output_off · Copper Mountain Vna MCP: Risk & Policy

WHAT IT DOES

What vna_output_off does on Copper Mountain Vna

AI agents invoke vna_output_off to trigger actions in Copper Mountain Vna. 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 vna_output_off needs a policy

This tool triggers an external hardware operation on a Vector Network Analyzer — specifically disabling the RF output signal. It is an action that affects physical instrument state, making it an Execute category (triggering external operations). While it describes itself as a 'safe state', misuse by an AI agent could disrupt ongoing measurements or calibration workflows.

From the tool's definition Disable RF output (safe state)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vna_output_off Rate-limited

vna_output_off 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": {
    "vna_output_off": {
      "limits": [
        {
          "counter": "vna_output_off_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 Copper Mountain Vna, so you can run agents against it safely.

FAQ

Questions about vna_output_off

What does the vna_output_off tool do? +

Disable RF output (safe state). It is categorised as a Execute tool in the Copper Mountain Vna MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on vna_output_off? +

Register the Copper Mountain Vna MCP server in PolicyLayer and add a rule for vna_output_off: 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 Copper Mountain Vna. Nothing to install.

What risk level is vna_output_off? +

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

Can I rate-limit vna_output_off? +

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

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

vna_output_off is provided by the Copper Mountain Vna MCP server (rfingadam/copper-mountain-vna-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.