subtractive_pipe
A execute tool on the FreeCAD Robust MCP server.
This record as markdown: /tools/spkane-freecad-addon-robust-mcp-server/subtractive-pipe.md
What subtractive_pipe does on FreeCAD Robust MCP Server
AI agents invoke subtractive_pipe 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_pipe is rated High
In FreeCAD, 'Subtractive Pipe' is a PartDesign operation that sweeps a profile along a path to remove (subtract) material from a solid body. Based on context from the server (3D modeling) and FreeCAD's known toolset, this likely triggers a modeling operation.
From the tool's definition Tool name 'subtractive_pipe' in a FreeCAD 3D modeling MCP server with 150+ tools; description is empty.
Attacks that exploit this kind of access
The rule that runs subtractive_pipe 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_pipe, this is the rule to start with:
subtractive_pipe 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_pipe call is checked against it from then on.
Questions about subtractive_pipe
subtractive_pipe 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_pipe: 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_pipe 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_pipe 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_pipe. 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_pipe 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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