create_finger_joint · Sketchup MCP: Risk & Policy

WHAT IT DOES

What create_finger_joint does on SketchupMCP

AI agents use create_finger_joint to create or update resources in SketchupMCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your SketchupMCP environment.

WHY IT NEEDS A POLICY

Why create_finger_joint needs a policy

This tool performs a Write operation as it creates or adds new geometry/features to the SketchUp model, modifying its structure reversibly. While the server permits arbitrary Ruby execution (which could be Execute/Destructive), this specific tool is scoped to creating a specific type of joint between components.

From the tool's definition Tool creates finger joints between components in SketchUp, which modifies the 3D model by adding geometric features.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_finger_joint Rate-limited

create_finger_joint 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": {
    "create_finger_joint": {
      "limits": [
        {
          "counter": "create_finger_joint_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches SketchupMCP, so you can run agents against it safely.

FAQ

Questions about create_finger_joint

What does the create_finger_joint tool do? +

Create a finger joint (box joint) between two components. It is categorised as a Write tool in the SketchupMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_finger_joint? +

Register the Sketchup MCP server in PolicyLayer and add a rule for create_finger_joint: 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 SketchupMCP. Nothing to install.

What risk level is create_finger_joint? +

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

Can I rate-limit create_finger_joint? +

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

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

create_finger_joint is provided by the Sketchup MCP server (piexl/sketchup-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.