Cavalry MCP

Cavalry MCP

Enables natural language control of Cavalry animation software for creating layers, setting attributes, keyframing, rendering frames, and more via an MCP server.

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cavalry-mcp

MCP server that connects Claude to Cavalry animation software. Create layers, set attributes, animate with keyframes, render frames, and more — all through natural language.

How it works

Claude <--MCP (stdio)--> cavalry-mcp <--HTTP POST--> Stallion <---> Cavalry

The MCP server sends JavaScript to Cavalry via the Stallion bridge (an HTTP server running inside Cavalry on 127.0.0.1:8080).

Prerequisites

  • Cavalry (with Stallion script enabled: Scripts > Stallion)
  • Node.js >= 18

Setup

npm install
npm run build

Configure in Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "cavalry": {
      "command": "node",
      "args": ["/absolute/path/to/cavalry-mcp/dist/index.js"]
    }
  }
}

Available tools

Tool Description
cavalry_ping Check if Cavalry + Stallion are reachable
cavalry_run_script Execute arbitrary JavaScript in Cavalry
cavalry_create_layer Create a layer (textShape, basicShape, null, etc.)
cavalry_set_attribute Set attributes on a layer
cavalry_get_attribute Read an attribute value
cavalry_connect Connect attributes between layers
cavalry_keyframe Set a keyframe at a specific frame
cavalry_magic_easing Apply easing to keyframed attributes
cavalry_get_scene_layers List all layers in the scene
cavalry_get_selected_layers Get currently selected layers
cavalry_select_layers Select layers by ID
cavalry_delete_layers Delete layers by ID
cavalry_get_composition_info Get resolution, frame range, FPS
cavalry_set_current_frame Move the playhead
cavalry_render_png Render current frame as PNG
cavalry_set_generator Set a generator on a layer (ellipse, rectangle, etc.)
cavalry_duplicate_layer Duplicate a layer
cavalry_get_bounding_box Get a layer's bounding box
cavalry_save_scene Save the scene
cavalry_open_scene Open a .cv scene file
cavalry_add_dynamic_attribute Add a dynamic attribute to a layer

Example conversation

You: Create a bouncing text that says "Hello World"

Claude will:

  1. Create a textShape layer
  2. Set the text content, font size, and color
  3. Add position keyframes for the bounce
  4. Apply BounceOut easing

Common layer types

basicShape, textShape, null, colorPlane, group, subMesh, linearGradient, duplicator, connectShape, noiseDeformer, stagger, trail, javaScriptUtility, javaScriptShape, imageAsset, videoAsset, soundAsset

Common attribute paths

  • position.x, position.y — Layer position
  • rotation — Rotation in degrees
  • scale.x, scale.y — Scale
  • opacity — Layer opacity (0–100)
  • fontSize — Text layer font size
  • fill.color — Fill color (hex string)
  • stroke.color, stroke.width — Stroke properties

License

MIT

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