Delete a constraint from a sketch. Args: sketch_name: Name of the sketch. constraint_index: Index of the constraint to delete. doc_name: Document containing the sketch. Uses active document if None. Returns: Dictionary with result: - success: Whether the deletion succeeded - constraint_count: Rem...
AI agents call delete_sketch_constraint to permanently remove resources in FreeCAD Robust MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes sketch constraints, which cannot be trivially undone and alter the structural geometry of a FreeCAD design. While the impact is scoped to a single constraint within a sketch (not a full document deletion), it represents an irreversible modification that could break design intent or model functionality. An AI agent carelessly deleting constraints could corrupt a user's design work.
From the tool's definition Tool name contains 'delete' and description states 'Delete a constraint from a sketch.' The operation removes a constraint irreversibly from the sketch model.
Documented attack patterns abuse exactly the kind of access delete_sketch_constraint 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 delete_sketch_constraint:
{
"version": "1",
"default": "deny",
"hide": [
"delete_sketch_constraint"
]
}delete_sketch_constraint disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
Free to start. No card required.
Delete a constraint from a sketch. Args: sketch_name: Name of the sketch. constraint_index: Index of the constraint to delete. doc_name: Document containing the sketch. Uses active document if None. Returns: Dictionary with result: - success: Whether the deletion succeeded - constraint_count: Remaining constraint count. It is categorised as a Destructive tool in the FreeCAD Robust MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for delete_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.
delete_sketch_constraint is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the delete_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.
Set action: deny in the PolicyLayer policy for delete_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.
delete_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.
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.