add_net

Add a new net to the PCB

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/add-net.md

WHAT IT DOES

What add_net does on KiCAD-MCP-Server

AI agents use add_net 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 add_net is rated Medium

This tool creates a new net (electrical connection group) in the PCB design. This is a Write operation because it creates new design data that can be modified or removed later. It is not Destructive because adding a net is reversible.

From the tool's definition Tool name 'add_net' and description 'Add a new net to the PCB' indicate creation of new design element. This modifies PCB design data by introducing a new electrical network, which is reversible through deletion or undo operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

add_net Rate-limited

add_net 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": {
    "add_net": {
      "limits": [
        {
          "counter": "add_net_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 add_net call is checked against it from then on.

FAQ

Questions about add_net

What does the add_net tool do? +

Add a new net to the PCB. 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 add_net? +

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

What risk level is add_net? +

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

Can I rate-limit add_net? +

Yes. Add a rate_limit block to the add_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.

How do I block add_net completely? +

Set action: deny in the PolicyLayer policy for add_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.

What MCP server provides add_net? +

add_net 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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