Search for minimum value in sweep
AI agents call vna_marker_search_min 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 for and returns the minimum value from sweep data—a read-only retrieval operation with no side effects. It does not execute arbitrary code, modify settings, delete data, or commit financial transactions. The minimal blast radius (only returns a numeric result) and lack of any reversible or irreversible modifications place it firmly in the Read category with low severity.
From the tool's definition Tool name 'vna_marker_search_min' and description 'Search for minimum value in sweep' indicate a query/search operation that retrieves data from an ongoing or stored sweep measurement without modifying instrument state or data.
Attacks that exploit this kind of access
Search for minimum 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_min: 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_min 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_min 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_min. 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_min 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.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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