add_joint

Add a physics joint/constraint between two GameObjects. Supports fixed, spring, and slider joint types

SERVERSbox SOURCEsbox-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/sbox/add-joint.md

WHAT IT DOES

What add_joint does on Sbox

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

RISK

Why add_joint is rated Medium

The tool adds (creates) a new physics joint configuration between game objects, which is a reversible modification to the game state. This fits the Write category (creates or modifies data reversibly). Severity is medium because misuse could create unintended physics constraints that break game functionality, but these are reversible by removing the joint.

From the tool's definition Tool description states 'Add a physics joint/constraint between two GameObjects' — this creates a new physics relationship in the game scene that modifies the world state reversibly.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_joint safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Sbox, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For add_joint, this is the rule to start with:

add_joint Rate-limited

add_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": {
    "add_joint": {
      "limits": [
        {
          "counter": "add_joint_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 Sbox, apply this rule, and every add_joint call is checked against it from then on.

FAQ

Questions about add_joint

What does the add_joint tool do? +

Add a physics joint/constraint between two GameObjects. Supports fixed, spring, and slider joint types. It is categorised as a Write tool in the Sbox MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_joint? +

Register the Sbox MCP server in PolicyLayer and add a rule for add_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 Sbox. Nothing to install.

What risk level is add_joint? +

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

Can I rate-limit add_joint? +

Yes. Add a rate_limit block to the add_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 add_joint completely? +

Set action: deny in the PolicyLayer policy for add_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 add_joint? +

add_joint is provided by the Sbox MCP server (sbox-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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