list_floating_labels

THE RISK

Low Risk

Why list_floating_labels needs a policy

This is a read-only operation that queries and retrieves data about unconnected net labels. It has no side effects, does not modify the schematic, and does not execute any operations. The worst-case misuse would be an agent gathering information about design issues, which poses minimal risk.

From the tool's definition Tool name and description indicate it 'Returns all net labels in the schematic that are not connected to any component pin' — a query operation that retrieves information without modifying or executing anything.

Documented attack patterns abuse exactly the kind of access list_floating_labels gives an agent:

POLICY

How to control list_floating_labels

PolicyLayer is an MCP gateway — it sits between your AI agents and KiCAD-MCP-Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_floating_labels:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_floating_labels": {}
  }
}

list_floating_labels is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register KiCAD-MCP-Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More KiCAD-MCP-Server tools

Destructive delete_component Remove a component from the PCB by its reference designator. Destructive delete_schematic_component Remove a placed symbol from a KiCAD schematic (.kicad_sch). This removes the symbol insta Destructive delete_schematic_net_label Remove a net label from the schematic. Destructive delete_schematic_wire Remove a wire from the schematic by start and end coordinates. Destructive delete_symbol Remove a symbol from a .kicad_sym library file. Destructive delete_trace Delete traces from the PCB. Can delete by UUID, position, or bulk-delete all traces on a n Destructive remove_schematic_component_property Remove a single custom property from a placed schematic symbol. Built-in fields (Referenc Execute autoroute Run Freerouting autorouter on the current PCB. Exports to Specctra DSN, runs Freerouting C

All 157 KiCAD-MCP-Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_floating_labels

What does the list_floating_labels tool do? +

Returns all net labels in the schematic that are not connected to any component pin. It is categorised as a Read tool in the KiCAD-MCP-Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_floating_labels? +

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

list_floating_labels is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_floating_labels? +

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

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

list_floating_labels 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.

Enforce policy on every KiCAD-MCP-Server tool call.

Start from KiCAD-MCP-Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →