Search for maximum value in sweep
AI agents call vna_marker_search_max 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.
This tool searches/queries existing measurement sweep data to locate a maximum value. It performs no writes, deletions, code execution, or financial operations. The operation is a read-only analysis of already-captured data. Severity is low because misuse would only return incorrect peak values, with no instrument or system damage possible.
From the tool's definition Tool name 'vna_marker_search_max' and description 'Search for maximum value in sweep' indicate a query operation that retrieves measurement data without modifying instrument state or settings.
Attacks that exploit this kind of access
Search for maximum value in sweep. 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_marker_search_max: 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_marker_search_max 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_marker_search_max 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_marker_search_max. 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_marker_search_max 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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