Toggle construction mode for a sketch geometry. Construction geometry is used for reference but not included in the final sketch profile. Args: sketch_name: Name of the sketch. geometry_index: Index of the geometry to toggle. doc_name: Document containing the sketch. Uses active document if None....
AI agents use toggle_construction 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.
The tool modifies an attribute of existing geometry (construction state) rather than creating, deleting, or executing arbitrary operations. The change is reversible—toggling can be undone by toggling again. While it affects the sketch, it does not execute code, delete data, or have financial implications.
From the tool's definition Tool modifies sketch geometry state by toggling construction mode (construction geometry property), which 'is used for reference but not included in the final sketch profile.' This is a reversible modification to sketch metadata/properties.
Documented attack patterns abuse exactly the kind of access toggle_construction 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 toggle_construction:
{
"version": "1",
"default": "deny",
"tools": {
"toggle_construction": {
"limits": [
{
"counter": "toggle_construction_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}toggle_construction 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.
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Toggle construction mode for a sketch geometry. Construction geometry is used for reference but not included in the final sketch profile. Args: sketch_name: Name of the sketch. geometry_index: Index of the geometry to toggle. doc_name: Document containing the sketch. Uses active document if None. Returns: Dictionary with result: - success: Whether the operation succeeded - is_construction: New construction state. 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 toggle_construction: 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.
toggle_construction 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 toggle_construction 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 toggle_construction. 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.
toggle_construction 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.