add_junction · KiCAD Schematic Manipulation MCP Server MCP

WHAT IT DOES

What add_junction does on KiCAD Schematic Manipulation MCP Server

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

WHY IT NEEDS A POLICY

Why add_junction needs a policy

This tool creates a new schematic element (a junction/connection point) but does not execute external code, trigger irreversible deletion, or move financial assets. Junctions are standard schematic components that can be added and removed. The modification is reversible — the junction can be undone or deleted.

From the tool's definition Tool description states 'Add a junction (connection point) to the schematic' — the verb 'Add' indicates creation of a new schematic element.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_junction Rate-limited

add_junction 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_junction": {
      "limits": [
        {
          "counter": "add_junction_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 KiCAD Schematic Manipulation MCP Server, so you can run agents against it safely.

FAQ

Questions about add_junction

What does the add_junction tool do? +

Add a junction (connection point) to the schematic. It is categorised as a Write tool in the KiCAD Schematic Manipulation 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_junction? +

Register the KiCAD Schematic Manipulation MCP Server MCP server in PolicyLayer and add a rule for add_junction: 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 Schematic Manipulation MCP Server. Nothing to install.

What risk level is add_junction? +

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

Can I rate-limit add_junction? +

Yes. Add a rate_limit block to the add_junction 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_junction completely? +

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

add_junction is provided by the KiCAD Schematic Manipulation MCP Server MCP server (richard-luc/kicad-schematic-manipulation). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.