add_sketch_constraint

A write tool on the FreeCAD Robust MCP server.

SERVERFreeCAD Robust MCP Server SOURCEspkane/freecad-addon-robust-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/spkane-freecad-addon-robust-mcp-server/add-sketch-constraint.md

WHAT IT DOES

What add_sketch_constraint does on FreeCAD Robust MCP Server

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

RISK

Why add_sketch_constraint is rated Medium

This tool creates or adds constraints to sketches, which modifies the 3D model state reversibly. Constraints can be removed or edited, making this a Write operation rather than Destructive. The tool has medium severity since constraint errors could affect design intent, but mistakes are reversible.

From the tool's definition Tool name 'add_sketch_constraint' and sibling tools (add_sketch_arc, add_sketch_circle, add_sketch_line, etc.) indicate sketch modification operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_sketch_constraint safely

PolicyLayer is an MCP gateway: it sits between your AI agents and FreeCAD Robust MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For add_sketch_constraint, this is the rule to start with:

add_sketch_constraint Rate-limited

add_sketch_constraint 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_sketch_constraint": {
      "limits": [
        {
          "counter": "add_sketch_constraint_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 FreeCAD Robust MCP Server, apply this rule, and every add_sketch_constraint call is checked against it from then on.

FAQ

Questions about add_sketch_constraint

What does the add_sketch_constraint tool do? +

add_sketch_constraint is a write tool on the FreeCAD Robust MCP Server MCP server. It is categorised as a Write tool in the FreeCAD Robust 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_sketch_constraint? +

Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for add_sketch_constraint: 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 FreeCAD Robust MCP Server. Nothing to install.

What risk level is add_sketch_constraint? +

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

Can I rate-limit add_sketch_constraint? +

Yes. Add a rate_limit block to the add_sketch_constraint 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_sketch_constraint completely? +

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

add_sketch_constraint is provided by the FreeCAD Robust MCP Server MCP server (spkane/freecad-addon-robust-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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