subtractive_loft
A execute tool on the FreeCAD Robust MCP server.
This record as markdown: /tools/spkane-freecad-addon-robust-mcp-server/subtractive-loft.md
What subtractive_loft does on FreeCAD Robust MCP Server
AI agents invoke subtractive_loft to trigger actions in FreeCAD Robust MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
Why subtractive_loft is rated High
In FreeCAD, a subtractive loft is a Part Design operation that removes material by lofting between profiles. Based on the name and context (3D modeling server), this likely triggers a geometry operation in FreeCAD. The description is empty, reducing confidence. Most severe plausible category is Execute (triggers an external 3D modeling operation), though it could be Write (modifies a model).
From the tool's definition Tool name 'subtractive_loft' on a FreeCAD MCP server with 150+ tools for 3D modeling; description is empty.
Attacks that exploit this kind of access
The rule that runs subtractive_loft 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 subtractive_loft, this is the rule to start with:
subtractive_loft stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect FreeCAD Robust MCP Server, apply this rule, and every subtractive_loft call is checked against it from then on.
Questions about subtractive_loft
subtractive_loft is a execute tool on the FreeCAD Robust MCP Server MCP server. It is categorised as a Execute tool in the FreeCAD Robust MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for subtractive_loft: 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.
subtractive_loft is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the subtractive_loft 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 subtractive_loft. 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.
subtractive_loft 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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