assign_net_to_class

Assign a net to an existing net class to apply its specific design rules.

SERVERKiCAD-MCP-Server SOURCEmixelpixx/kicad-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mixelpixx-kicad-mcp-server/assign-net-to-class.md

WHAT IT DOES

What assign_net_to_class does on KiCAD-MCP-Server

AI agents use assign_net_to_class to create or update resources in KiCAD-MCP-Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your KiCAD-MCP-Server environment.

RISK

Why assign_net_to_class is rated Medium

This is a Write operation because it creates or modifies data (net-to-class association) in a reversible manner within the PCB design. The tool does not delete data or execute arbitrary code, but rather updates the configuration of electrical design rules.

From the tool's definition Tool assigns a net to an existing net class, modifying net classification and design rule associations. The description states 'Assign a net to an existing net class to apply its specific design rules,' indicating it modifies net properties and electrical…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs assign_net_to_class safely

PolicyLayer is an MCP gateway: it sits between your AI agents and KiCAD-MCP-Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For assign_net_to_class, this is the rule to start with:

assign_net_to_class Rate-limited

assign_net_to_class 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": {
    "assign_net_to_class": {
      "limits": [
        {
          "counter": "assign_net_to_class_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect KiCAD-MCP-Server, apply this rule, and every assign_net_to_class call is checked against it from then on.

FAQ

Questions about assign_net_to_class

What does the assign_net_to_class tool do? +

Assign a net to an existing net class to apply its specific design rules. It is categorised as a Write tool in the KiCAD-MCP-Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on assign_net_to_class? +

Register the KiCAD-MCP-Server MCP server in PolicyLayer and add a rule for assign_net_to_class: 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-MCP-Server. Nothing to install.

What risk level is assign_net_to_class? +

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

Can I rate-limit assign_net_to_class? +

Yes. Add a rate_limit block to the assign_net_to_class 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 assign_net_to_class completely? +

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

assign_net_to_class is provided by the KiCAD-MCP-Server MCP server (mixelpixx/kicad-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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