annotate_schematic

Assign reference designators to unannotated components (R? → R1, R2, ...). Must be called before tools that require known references.

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/annotate-schematic.md

WHAT IT DOES

What annotate_schematic does on KiCAD-MCP-Server

AI agents use annotate_schematic 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 annotate_schematic is rated Medium

This tool modifies schematic data by assigning reference designators to components, which is a reversible create/update operation. It changes component annotations from placeholder values (R?) to actual identifiers (R1, R2, etc.), making it a Write operation.

From the tool's definition Assign reference designators to unannotated components (R? → R1, R2, ...). Must be called before tools that require known references.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

annotate_schematic Rate-limited

annotate_schematic 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": {
    "annotate_schematic": {
      "limits": [
        {
          "counter": "annotate_schematic_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 annotate_schematic call is checked against it from then on.

FAQ

Questions about annotate_schematic

What does the annotate_schematic tool do? +

Assign reference designators to unannotated components (R? → R1, R2, ...). Must be called before tools that require known references. 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 annotate_schematic? +

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

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

Can I rate-limit annotate_schematic? +

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

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

annotate_schematic 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.

KEEP EXPLORING

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Govern customer-ops agents →Argument validation →Scoped token →