add_symbol_property

Add or update a custom property (Manufacturer, MPN, LCSC, etc.) on a symbol in a .kicad_sym

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

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mixelpixx-kicad-mcp-server/add-symbol-property.md

WHAT IT DOES

What add_symbol_property does on KiCAD-MCP-Server

AI agents use add_symbol_property to create or update resources in KiCAD-MCP-Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your KiCAD-MCP-Server environment.

RISK

Why add_symbol_property is rated Medium

Modifies symbol metadata reversibly in KiCAD schematic files, affecting component documentation and sourcing information.

From the tool's definition Add or update a custom property on a symbol in .kicad_sym

Attacks that exploit this kind of access

RECOMMENDED RULE

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

add_symbol_property Rate-limited

add_symbol_property 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_symbol_property": {
      "limits": [
        {
          "counter": "add_symbol_property_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT 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 add_symbol_property call is checked against it from then on.

FAQ

Questions about add_symbol_property

What does the add_symbol_property tool do? +

Add or update a custom property (Manufacturer, MPN, LCSC, etc.) on a symbol in a .kicad_sym. It is categorised as a Write tool in the KiCAD-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_symbol_property? +

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

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

Can I rate-limit add_symbol_property? +

Yes. Add a rate_limit block to the add_symbol_property 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_symbol_property completely? +

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

add_symbol_property 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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