freecad_boolean_union

THE RISK

Medium Risk

Why freecad_boolean_union needs a policy

Boolean union is a constructive modeling operation that creates or modifies geometry in a CAD document. While it generates new data structures, it is reversible (can be undone), distinguishing it from destructive operations. It does not execute arbitrary code, delete data, or move money, making Write the appropriate category.

From the tool's definition The tool 'freecad_boolean_union' performs a boolean union (fuse) operation between two objects in FreeCAD. This creates a new combined geometry by merging two shapes, which modifies the CAD model state.

Documented attack patterns abuse exactly the kind of access freecad_boolean_union gives an agent:

POLICY

How to control freecad_boolean_union

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 freecad_boolean_union:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "freecad_boolean_union": {
      "limits": [
        {
          "counter": "freecad_boolean_union_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

freecad_boolean_union 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.

Create a free account and register Mcp Freecad — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Mcp Freecad tools

Execute emit_custom_event Emit a custom event Execute freecad_boolean_cut Perform a boolean cut (difference) between two objects (object1 - object2). Execute subscribe_to_events Subscribe to FreeCAD events Write boolean_cut Perform boolean cut (subtraction) of two objects Write boolean_intersection Perform boolean intersection of two objects Write boolean_union Perform boolean union of two objects Write create_box Create a box/cube primitive in FreeCAD Write create_cone Create a cone primitive in FreeCAD

All 34 Mcp Freecad tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about freecad_boolean_union

What does the freecad_boolean_union tool do? +

Perform a boolean union (fuse) between 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.

How do I enforce a policy on freecad_boolean_union? +

Register the Mcp Freecad MCP server in PolicyLayer and add a rule for freecad_boolean_union: 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.

What risk level is freecad_boolean_union? +

freecad_boolean_union is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit freecad_boolean_union? +

Yes. Add a rate_limit block to the freecad_boolean_union 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.

How do I block freecad_boolean_union completely? +

Set action: deny in the PolicyLayer policy for freecad_boolean_union. 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.

What MCP server provides freecad_boolean_union? +

freecad_boolean_union 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.

Enforce policy on every Mcp Freecad tool call.

Start from Mcp Freecad, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →