Add a regular polygon to a sketch. Args: sketch_name: Name of the sketch to add polygon to. center_x: X coordinate of center. center_y: Y coordinate of center. radius: Circumscribed circle radius. sides: Number of sides (3 for triangle, 6 for hexagon, etc.). doc_name: Document containing the sket...
AI agents use add_sketch_polygon 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.
This tool creates new 3D modeling geometry (a polygon) within a FreeCAD sketch, which is a reversible write operation. It modifies the sketch by adding geometry but does not execute arbitrary code, delete data, or affect financial systems.
From the tool's definition Tool description states it will "Add a regular polygon to a sketch" and returns geometry info including first_line_index and geometry_count, indicating creation of new sketch geometry elements.
Documented attack patterns abuse exactly the kind of access add_sketch_polygon gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and FreeCAD Robust MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for add_sketch_polygon:
{
"version": "1",
"default": "deny",
"tools": {
"add_sketch_polygon": {
"limits": [
{
"counter": "add_sketch_polygon_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_sketch_polygon 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.
Free to start. No card required.
Add a regular polygon to a sketch. Args: sketch_name: Name of the sketch to add polygon to. center_x: X coordinate of center. center_y: Y coordinate of center. radius: Circumscribed circle radius. sides: Number of sides (3 for triangle, 6 for hexagon, etc.). doc_name: Document containing the sketch. Uses active document if None. Returns: Dictionary with geometry info: - first_line_index: Index of the first line - geometry_count: Total geometry elements. 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.
Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for add_sketch_polygon: 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.
add_sketch_polygon is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the add_sketch_polygon 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.
Set action: deny in the PolicyLayer policy for add_sketch_polygon. 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.
add_sketch_polygon 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.
Deterministic rules across all 152 FreeCAD Robust MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
152 FreeCAD Robust MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.