create_netclass

Create a new net class with custom design rules, optionally assigning nets to it immediately.

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/create-netclass.md

WHAT IT DOES

What create_netclass does on KiCAD-MCP-Server

AI agents use create_netclass 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 create_netclass is rated Medium

The tool creates and configures new net classes (electrical design abstractions) with custom rules, which modifies the KiCAD project structure reversibly. This is a Write operation—it adds new design elements that can be edited or deleted later. It is not Read (no query), Execute (no arbitrary code), Destructive (reversible), or Financial.

From the tool's definition Tool name 'create_netclass' and description 'Create a new net class with custom design rules, optionally assigning nets to it immediately' indicate creation of new design objects with persistent state changes.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_netclass 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 create_netclass, this is the rule to start with:

create_netclass Rate-limited

create_netclass 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": {
    "create_netclass": {
      "limits": [
        {
          "counter": "create_netclass_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 create_netclass call is checked against it from then on.

FAQ

Questions about create_netclass

What does the create_netclass tool do? +

Create a new net class with custom design rules, optionally assigning nets to it immediately. 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 create_netclass? +

Register the KiCAD-MCP-Server MCP server in PolicyLayer and add a rule for create_netclass: 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 create_netclass? +

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

Can I rate-limit create_netclass? +

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

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

create_netclass 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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