# joint_create

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.

Agent View of the PolicyLayer registry record for `joint_create`. HTML page: https://policylayer.com/tools/godot-breakpoint-mcp/joint-create

## Facts

- Tool: `joint_create`
- Server: Godot Breakpoint (`jlivingston-Cipher/godot-breakpoint-mcp`) — https://policylayer.com/tools/godot-breakpoint-mcp.md
- Homepage: https://github.com/jlivingston-Cipher/godot-breakpoint-mcp
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "joint_create",
    "arguments": {}
  }
}
```

## Why joint_create is rated Medium

The tool creates new physics joint nodes in a scene, which is a modification operation (Write category). It is explicitly marked as 'undoable', meaning changes can be reverted, making it reversible rather than destructive. Severity is medium because while it modifies the scene structure, the effect is limited to adding a joint node within the editor context and can be undone.

From the tool's own definition: "Tool description states it will 'Add a physics joint node under a parent in the edited scene' and specifies it is 'undoable'. This is a reversible creation/modification operation within the Godot editor scene."

## Use case

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

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Godot Breakpoint:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "joint_create": {
      "limits": [
        {
          "counter": "joint_create_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Godot Breakpoint (238)

- `anim_delete` — Destructive — https://policylayer.com/tools/godot-breakpoint-mcp/anim-delete.md
- `anim_remove_key` — Destructive — https://policylayer.com/tools/godot-breakpoint-mcp/anim-remove-key.md
- `cs_rename` — Destructive — https://policylayer.com/tools/godot-breakpoint-mcp/cs-rename.md
- `filesystem_move` — Destructive — https://policylayer.com/tools/godot-breakpoint-mcp/filesystem-move.md
- `inputmap_erase_action` — Destructive — https://policylayer.com/tools/godot-breakpoint-mcp/inputmap-erase-action.md
- `node_delete` — Destructive — https://policylayer.com/tools/godot-breakpoint-mcp/node-delete.md
- `project_remove_autoload` — Destructive — https://policylayer.com/tools/godot-breakpoint-mcp/project-remove-autoload.md
- `scene_close` — Destructive — https://policylayer.com/tools/godot-breakpoint-mcp/scene-close.md
- `scene_reload` — Destructive — https://policylayer.com/tools/godot-breakpoint-mcp/scene-reload.md
- `shader_set_code` — Destructive — https://policylayer.com/tools/godot-breakpoint-mcp/shader-set-code.md
- `tilemap_clear` — Destructive — https://policylayer.com/tools/godot-breakpoint-mcp/tilemap-clear.md
- `cs_dbg_attach` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/cs-dbg-attach.md
- `cs_dbg_continue` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/cs-dbg-continue.md
- `cs_dbg_evaluate` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/cs-dbg-evaluate.md
- `cs_dbg_launch` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/cs-dbg-launch.md
- `cs_dbg_restart` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/cs-dbg-restart.md
- `cs_dbg_set_exception_breakpoints` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/cs-dbg-set-exception-breakpoints.md
- `cs_dbg_step` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/cs-dbg-step.md
- `dbg_attach` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/dbg-attach.md
- `dbg_continue` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/dbg-continue.md
- `dbg_evaluate` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/dbg-evaluate.md
- `dbg_goto` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/dbg-goto.md
- `dbg_launch` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/dbg-launch.md
- `dbg_restart` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/dbg-restart.md
- `dbg_set_exception_breakpoints` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/dbg-set-exception-breakpoints.md
- `dbg_set_variable` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/dbg-set-variable.md
- `dbg_step` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/dbg-step.md
- `filesystem_scan` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/filesystem-scan.md
- `godot_launch_editor` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/godot-launch-editor.md
- `godot_run_managed` — Execute — https://policylayer.com/tools/godot-breakpoint-mcp/godot-run-managed.md
- …and 208 more: https://policylayer.com/tools/godot-breakpoint-mcp.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=godot-breakpoint-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/godot-breakpoint-mcp