vna_set_averaging · Copper Mountain Vna MCP: Risk & Policy

WHAT IT DOES

What vna_set_averaging does on Copper Mountain Vna

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

WHY IT NEEDS A POLICY

Why vna_set_averaging needs a policy

This tool modifies VNA measurement parameters (averaging configuration) which affects how the instrument collects and processes data. While the change is reversible and does not delete data or execute arbitrary code, it constitutes a Write operation as it alters instrument state.

From the tool's definition Tool name 'vna_set_averaging' and description 'Configure sweep averaging' indicate modification of VNA instrument settings. This is a configuration change that affects measurement behavior but is reversible by reconfiguring the setting to a different value.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vna_set_averaging Rate-limited

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

FAQ

Questions about vna_set_averaging

What does the vna_set_averaging tool do? +

Configure sweep averaging. It is categorised as a Write tool in the Copper Mountain Vna MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on vna_set_averaging? +

Register the Copper Mountain Vna MCP server in PolicyLayer and add a rule for vna_set_averaging: 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_set_averaging? +

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

Can I rate-limit vna_set_averaging? +

Yes. Add a rate_limit block to the vna_set_averaging 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_set_averaging completely? +

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

vna_set_averaging 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.