list_libraries

List all available KiCAD footprint libraries

SERVERKiCAD-MCP-Server SOURCEmixelpixx/kicad-mcp-server

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mixelpixx-kicad-mcp-server/list-libraries.md

WHAT IT DOES

What list_libraries does on KiCAD-MCP-Server

AI agents call list_libraries to retrieve information from KiCAD-MCP-Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why list_libraries is rated Low

This tool performs a simple enumeration of available footprint libraries in KiCAD. It retrieves information without side effects, making it a Read operation. The blast radius of misuse is minimal—an agent could only learn what libraries are available, which is non-sensitive metadata. Severity is low because there are no destructive or system-altering consequences.

From the tool's definition Tool name 'list_libraries' and description 'List all available KiCAD footprint libraries' indicate a read-only query operation that retrieves library metadata without modifying any data.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

list_libraries Allowed

list_libraries is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY 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 list_libraries call is checked against it from then on.

FAQ

Questions about list_libraries

What does the list_libraries tool do? +

List all available KiCAD footprint libraries. 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_libraries? +

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

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

Can I rate-limit list_libraries? +

Yes. Add a rate_limit block to the list_libraries 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_libraries completely? +

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

list_libraries 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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