kicad.add_no_connect · Eda MCP: Risk & Policy

WHAT IT DOES

What kicad.add_no_connect does on Eda

AI agents use kicad.add_no_connect to create or update resources in Eda — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Eda environment.

WHY IT NEEDS A POLICY

Why kicad.add_no_connect needs a policy

This tool creates or modifies schematic annotations reversibly. While it changes design validation state, it does not execute arbitrary commands, delete data, or cause irreversible changes. The modification can be undone by removing the flag. This is a Write operation typical of PCB design tools that create or update design elements.

From the tool's definition Tool marks an unused pin with a no-connect flag, modifying schematic state. The description explicitly indicates it changes ERC (Electrical Rule Check) validation status by adding a flag to the design.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

kicad.add_no_connect Rate-limited

kicad.add_no_connect 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": {
    "kicad.add_no_connect": {
      "limits": [
        {
          "counter": "kicad.add_no_connect_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Eda, so you can run agents against it safely.

FAQ

Questions about kicad.add_no_connect

What does the kicad.add_no_connect tool do? +

Mark an unused pin with a no-connect flag. Required to pass ERC. It is categorised as a Write tool in the Eda MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on kicad.add_no_connect? +

Register the Eda MCP server in PolicyLayer and add a rule for kicad.add_no_connect: 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 Eda. Nothing to install.

What risk level is kicad.add_no_connect? +

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

Can I rate-limit kicad.add_no_connect? +

Yes. Add a rate_limit block to the kicad.add_no_connect 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 kicad.add_no_connect completely? +

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

kicad.add_no_connect is provided by the Eda MCP server (saeronlab/eda-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.