set_layer_constraints

Set per-layer design rule constraints (minimum track width, clearance and via dimensions).

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/set-layer-constraints.md

WHAT IT DOES

What set_layer_constraints does on KiCAD-MCP-Server

AI agents use set_layer_constraints 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 set_layer_constraints is rated Medium

This tool creates or modifies design rule constraints in a KiCAD project. While reversible (rules can be changed again), it has high severity because incorrect layer constraints can cause manufacturing defects, electrical failures, or safety hazards in the resulting PCB.

From the tool's definition Tool description states it can 'Set per-layer design rule constraints (minimum track width, clearance and via dimensions)' — this modifies design rules that govern PCB manufacturing and electrical safety.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

set_layer_constraints Rate-limited

set_layer_constraints 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": {
    "set_layer_constraints": {
      "limits": [
        {
          "counter": "set_layer_constraints_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 set_layer_constraints call is checked against it from then on.

FAQ

Questions about set_layer_constraints

What does the set_layer_constraints tool do? +

Set per-layer design rule constraints (minimum track width, clearance and via dimensions). 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 set_layer_constraints? +

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

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

Can I rate-limit set_layer_constraints? +

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

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

set_layer_constraints 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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