AI agents call trace_hierarchical_net to retrieve information from Kicad without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The name suggests a read/analysis operation (tracing a net through a hierarchy), which is consistent with the server's description of analysis tools. However, the description is empty, so confidence is low. Based on naming convention alone, 'trace' typically implies a read/query operation rather than modification. Severity is medium given the complexity of PCB/schematic data that could be exposed.
From the tool's definition Tool name 'trace_hierarchical_net' suggests reading/tracing net connectivity in a hierarchical schematic design.
Attacks that exploit this kind of access
trace_hierarchical_net. It is categorised as a Read tool in the Kicad MCP Server, which means it retrieves data without modifying state.
Register the Kicad MCP server in PolicyLayer and add a rule for trace_hierarchical_net: 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 Kicad. Nothing to install.
trace_hierarchical_net 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 trace_hierarchical_net 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 trace_hierarchical_net. 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.
trace_hierarchical_net is provided by the Kicad MCP server (productofamerica/mcp-server-kicad). 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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