Measure VSWR at specific frequency
AI agents call vna_measure_vswr to retrieve information from Copper Mountain Vna without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool queries the VNA to obtain VSWR (Voltage Standing Wave Ratio) data at a specified frequency. Measurement operations retrieve instrument data without side effects—no configuration is changed, no calibration is altered, and no data is deleted or overwritten. This fits squarely in the Read category.
From the tool's definition vna_measure_vswr performs a measurement operation ('Measure VSWR at specific frequency') that retrieves data from the Vector Network Analyzer without modifying instrument state, configuration, or calibration. This is a pure data retrieval operation.
Attacks that exploit this kind of access
Measure VSWR at specific frequency. It is categorised as a Read tool in the Copper Mountain Vna MCP Server, which means it retrieves data without modifying state.
Register the Copper Mountain Vna MCP server in PolicyLayer and add a rule for vna_measure_vswr: 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.
vna_measure_vswr is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the vna_measure_vswr 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.
Set action: deny in the PolicyLayer policy for vna_measure_vswr. 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.
vna_measure_vswr 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.
Every MCP server has a record like this.
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