list_symbols_in_library

THE RISK

Low Risk

Why list_symbols_in_library needs a policy

This tool retrieves and enumerates symbol names from a KiCAD library file. It performs no data creation, modification, deletion, or execution of external operations. The action is informational only and read-only, making it a straightforward Read category tool with low severity even if misused by an agent.

From the tool's definition Tool name contains 'list' and description states 'List all symbol names' - a pure retrieval operation with no side effects. Queries existing data from a .kicad_sym library file without modification.

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

POLICY

How to control list_symbols_in_library

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_symbols_in_library:

policy.json

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

list_symbols_in_library 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

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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_symbols_in_library

What does the list_symbols_in_library tool do? +

List all symbol names in a .kicad_sym library file. 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_symbols_in_library? +

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

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

Can I rate-limit list_symbols_in_library? +

Yes. Add a rate_limit block to the list_symbols_in_library 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_symbols_in_library completely? +

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

list_symbols_in_library 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 →