constrain_radius

A write tool on the FreeCAD Robust MCP server.

SERVERFreeCAD Robust MCP Server SOURCEspkane/freecad-addon-robust-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/spkane-freecad-addon-robust-mcp-server/constrain-radius.md

WHAT IT DOES

What constrain_radius does on FreeCAD Robust MCP Server

AI agents use constrain_radius 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.

RISK

Why constrain_radius is rated Medium

This tool creates or modifies sketch constraints in FreeCAD, which is a Write operation (reversible data modification). It does not delete data (not Destructive), execute arbitrary code (not Execute), or move money (not Financial). Severity is medium because misuse could corrupt a design file or make it non-manufacturable, requiring rework, but the operation is undoable in FreeCAD.

From the tool's definition Tool name is 'constrain_radius' with empty description. Based on sibling tools (add_sketch_arc, add_sketch_circle, add_sketch_constraint, etc.), this operates within FreeCAD's sketch constraint system.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs constrain_radius 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 constrain_radius, this is the rule to start with:

constrain_radius Rate-limited

constrain_radius 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.

View as policy code

policy.json

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

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect FreeCAD Robust MCP Server, apply this rule, and every constrain_radius call is checked against it from then on.

FAQ

Questions about constrain_radius

What does the constrain_radius tool do? +

constrain_radius is a write tool on the FreeCAD Robust MCP Server MCP server. 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.

How do I enforce a policy on constrain_radius? +

Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for constrain_radius: 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.

What risk level is constrain_radius? +

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

Can I rate-limit constrain_radius? +

Yes. Add a rate_limit block to the constrain_radius 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 constrain_radius completely? +

Set action: deny in the PolicyLayer policy for constrain_radius. 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 constrain_radius? +

constrain_radius 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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