add_label · KiCAD Schematic Manipulation MCP Server MCP

WHAT IT DOES

What add_label does on KiCAD Schematic Manipulation MCP Server

AI agents use add_label 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_label needs a policy

This tool creates new data (a text label) in a schematic file in a reversible manner. It does not execute code, delete data, move money, or trigger external operations. Adding a label is a normal design operation that can be undone. The blast radius is minimal—an AI agent might add redundant or confusing labels, but this does not corrupt the schematic or cause irreversible damage.

From the tool's definition Tool name 'add_label' and description 'Add a text label to the schematic' indicate creating/adding new annotation elements to a KiCAD schematic file.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_label Rate-limited

add_label 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_label": {
      "limits": [
        {
          "counter": "add_label_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_label

What does the add_label tool do? +

Add a text label 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_label? +

Register the KiCAD Schematic Manipulation MCP Server MCP server in PolicyLayer and add a rule for add_label: 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_label? +

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

Can I rate-limit add_label? +

Yes. Add a rate_limit block to the add_label 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_label completely? +

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

add_label 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.