add_sketch_arc

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-arc.md

WHAT IT DOES

What add_sketch_arc does on FreeCAD Robust MCP Server

AI agents use add_sketch_arc 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_arc is rated Medium

This tool creates/adds a new sketch arc to a FreeCAD design document. Creating geometric elements modifies the model state reversibly—arcs can be deleted or modified afterward. This is a Write operation (creates data). Severity is medium because misuse could corrupt a design or waste computation resources, but the effect is reversible and limited to a single sketch element.

From the tool's definition Tool name 'add_sketch_arc' indicates creation of a sketch arc geometry element in FreeCAD. Sibling tools (add_sketch_bspline, add_sketch_circle, add_sketch_ellipse, add_sketch_line, add_sketch_point, add_sketch_polygon, add_sketch_rectangle) all create…

Attacks that exploit this kind of access

RECOMMENDED RULE

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

add_sketch_arc Rate-limited

add_sketch_arc 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_arc": {
      "limits": [
        {
          "counter": "add_sketch_arc_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_arc call is checked against it from then on.

FAQ

Questions about add_sketch_arc

What does the add_sketch_arc tool do? +

add_sketch_arc 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_arc? +

Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for add_sketch_arc: 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_arc? +

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

Can I rate-limit add_sketch_arc? +

Yes. Add a rate_limit block to the add_sketch_arc 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_arc completely? +

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

add_sketch_arc 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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