create_symbol

Create a new schematic symbol in a .kicad_sym library file (created if missing).

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/create-symbol.md

WHAT IT DOES

What create_symbol does on KiCAD-MCP-Server

AI agents use create_symbol 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 create_symbol is rated Medium

This tool creates or modifies schematic symbol data in KiCAD library files. While creation is a write operation, it is reversible—symbols can be edited or removed without permanent data loss. The blast radius is medium because corrupted or malicious symbols could propagate through designs, but the operation itself is not destructive or irreversible.

From the tool's definition Tool description states 'Create a new schematic symbol' and 'created if missing', indicating creation of new data structures in library files that are reversible (symbols can be edited, deleted, or replaced).

Attacks that exploit this kind of access

RECOMMENDED RULE

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

create_symbol Rate-limited

create_symbol 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": {
    "create_symbol": {
      "limits": [
        {
          "counter": "create_symbol_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 create_symbol call is checked against it from then on.

FAQ

Questions about create_symbol

What does the create_symbol tool do? +

Create a new schematic symbol in a .kicad_sym library file (created if missing). 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 create_symbol? +

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

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

Can I rate-limit create_symbol? +

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

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

create_symbol 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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