list_symbol_libraries

List all available KiCAD symbol libraries from global sym-lib-table, plus the project

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-symbol-libraries.md

WHAT IT DOES

What list_symbol_libraries does on KiCAD-MCP-Server

AI agents call list_symbol_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_symbol_libraries is rated Low

This tool retrieves and enumerates symbol libraries from KiCAD's configuration without modifying, executing, or deleting anything. It is a pure read operation that simply exposes available library metadata. The blast radius of misuse is minimal—an attacker could discover which libraries are available, but cannot manipulate designs or execute code.

From the tool's definition Tool name 'list_symbol_libraries' and description 'List all available KiCAD symbol libraries' indicate a retrieval/query operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

list_symbol_libraries Allowed

list_symbol_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_symbol_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_symbol_libraries call is checked against it from then on.

FAQ

Questions about list_symbol_libraries

What does the list_symbol_libraries tool do? +

List all available KiCAD symbol libraries from global sym-lib-table, plus the project. 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_symbol_libraries? +

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

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

Can I rate-limit list_symbol_libraries? +

Yes. Add a rate_limit block to the list_symbol_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_symbol_libraries completely? +

Set action: deny in the PolicyLayer policy for list_symbol_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_symbol_libraries? +

list_symbol_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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