AI agents use boolean_cut to create or update resources in Mcp Freecad — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Freecad environment.
Boolean cut is a constructive modeling operation that creates a new object through subtraction, modifying the CAD design. While it changes data (the geometry/structure of models), it is reversible through standard CAD undo functionality or by recreating the original objects, distinguishing it from Destructive operations. It does not execute arbitrary code, delete data irreversibly, or move money.
From the tool's definition The tool performs a 'boolean cut (subtraction) of two objects' which modifies a CAD model by removing material from one object using another.
Documented attack patterns abuse exactly the kind of access boolean_cut gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Freecad, and nothing reaches the server without passing your rules. This is the rule we recommend for boolean_cut:
{
"version": "1",
"default": "deny",
"tools": {
"boolean_cut": {
"limits": [
{
"counter": "boolean_cut_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}boolean_cut 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.
Perform boolean cut (subtraction) of two objects. It is categorised as a Write tool in the Mcp Freecad MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Freecad MCP server in PolicyLayer and add a rule for boolean_cut: 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 Mcp Freecad. Nothing to install.
boolean_cut 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 boolean_cut 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 boolean_cut. 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.
boolean_cut is provided by the Mcp Freecad MCP server (jango-blockchained/mcp-freecad). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Freecad, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
34 Mcp Freecad tools catalogued and risk-classified — across an index of 43,000+ MCP servers.