joint_create

SERVERBreakpoint SOURCEbreakpoint-mcp

Medium RISK CLASS

Category Write

Parameters 62 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/breakpoint-mcp/joint-create.md

WHAT IT DOES

What joint_create does on Breakpoint

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

Parameter	Type	Required	Description
`dim`	string	—	Dimension: "2d" (default) or "3d"
`name`	string	—	Node name (default the class name, e.g. "PinJoint2D")
`type`	string	Yes	Joint kind; pin works in both dims, the rest are dim-specific
`node_a`	string	—	NodePath (relative to the joint) of the first body
`node_b`	string	—	NodePath (relative to the joint) of the second body
`parent_path`	string	Yes	Parent node path relative to the scene root; "." for the root

Parameters from the server's own tool schema.

RISK

Why joint_create is rated Medium

This tool creates new physics joint nodes in an active scene, which is a reversible modification operation (marked as undoable). This fits the Write category: it creates new data structures within the scene hierarchy.

From the tool's definition Tool description states it will 'Add a physics joint node under a parent in the edited scene (undoable)' and notes it is 'In-scene and undoable — not gated.' These phrases indicate the tool creates new scene objects that modify the current project state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs joint_create safely

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

joint_create Rate-limited

joint_create 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": {
    "joint_create": {
      "limits": [
        {
          "counter": "joint_create_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 Breakpoint, apply this rule, and every joint_create call is checked against it from then on.

FAQ

Questions about joint_create

What does the joint_create tool do? +

Add a physics joint node under a parent in the edited scene (undoable). 2D types: pin | groove | spring (PinJoint2D/GrooveJoint2D/DampedSpringJoint2D); 3D types: pin | hinge | slider | cone_twist | generic6dof (PinJoint3D/HingeJoint3D/SliderJoint3D/ConeTwistJoint3D/Generic6DOFJoint3D). Optionally wire node_a/node_b to the two bodies. In-scene and undoable — not gated. It is categorised as a Write tool in the Breakpoint MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does joint_create accept? +

joint_create accepts 6 parameters: dim, name, type, node_a, node_b, parent_path. Required: type, parent_path. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on joint_create? +

Register the Breakpoint MCP server in PolicyLayer and add a rule for joint_create: 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 Breakpoint. Nothing to install.

What risk level is joint_create? +

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

Can I rate-limit joint_create? +

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

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

joint_create is provided by the Breakpoint MCP server (breakpoint-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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