vna_calibration_apply · Copper Mountain Vna MCP

WHAT IT DOES

What vna_calibration_apply does on Copper Mountain Vna

AI agents use vna_calibration_apply 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_calibration_apply needs a policy

The tool calculates and saves calibration coefficients to the VNA, which modifies the device's persistent calibration state. This is reversible (calibration can be recalibrated or cleared with other tools like vna_clear_port_extension), so it is Write rather than Destructive.

From the tool's definition Tool name 'vna_calibration_apply' and description 'Apply calibration (calculate and save coefficients)' indicate the tool modifies calibration state by saving coefficients to the Vector Network Analyzer device.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vna_calibration_apply Rate-limited

vna_calibration_apply 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_calibration_apply": {
      "limits": [
        {
          "counter": "vna_calibration_apply_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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_calibration_apply

What does the vna_calibration_apply tool do? +

Apply calibration (calculate and save coefficients). 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_calibration_apply? +

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

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

Can I rate-limit vna_calibration_apply? +

Yes. Add a rate_limit block to the vna_calibration_apply 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_calibration_apply completely? +

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

vna_calibration_apply 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.