Spline

Code style: crackerjack Runtime: oneiric Framework: FastMCP uv Python: 3.13+

MCP server for Spline.design code generation and asset management.

Overview

Spline.design is a 3D design tool that exports interactive scenes for the web. This MCP server provides:

• Code Generation: Generate React, Next.js, and vanilla JS integration code
• Asset Management: Download, cache, and validate .splinecode files
• Integration Support: WebSocket (Mahavishnu) and n8n workflow integration
• Helper Utilities: URL building, event documentation, code snippets

Note: Spline does not have a traditional REST API. Scenes are created in the Spline editor and exported as .splinecode files for runtime use.

Installation

uv pip install -e .

Quick Start

Generate a React Component

spline-mcp generate react https://prod.spline.design/6Wq1Q7YGyM-iab9i/scene.splinecode

Download a Scene

spline-mcp download https://prod.spline.design/6Wq1Q7YGyM-iab9i/scene.splinecode

MCP Server Usage

Stdio Mode (default)

spline-mcp serve

HTTP Mode

spline-mcp serve --http --port 3048

Available Tools

Code Generation

Tool	Description
generate_react_component	Generate React component with TypeScript
generate_vanilla_js	Generate standalone HTML/JS
generate_nextjs_component	Generate Next.js component with SSR support
generate_event_handler	Generate event handler code
generate_variable_binding	Generate runtime variable bindings
generate_full_integration	Complete integration with all features

Asset Management

Tool	Description
download_scene	Download and cache a .splinecode file
validate_scene	Validate a .splinecode file
list_cached_scenes	List all cached scenes
clear_cache	Clear cached scenes
get_cache_stats	Get cache statistics

Helper Utilities

Tool	Description
build_export_url	Build export URL from scene ID
parse_scene_url	Parse URL to extract scene ID
list_event_types	List supported Spline event types
get_event_documentation	Get docs for specific event
generate_snippet	Generate common code snippets

Integration

Tool	Description
get_websocket_status	Check Mahavishnu WebSocket connection
subscribe_to_channel	Subscribe to real-time updates
get_n8n_status	Check n8n availability
generate_n8n_workflow	Generate n8n workflow for Spline
trigger_n8n_webhook	Trigger n8n webhook
get_integration_status	Status of all integrations

Configuration

Set via environment variables with SPLINE_ prefix:

Variable	Default	Description
SPLINE_DEFAULT_FRAMEWORK	react	Default framework (react/vanilla/nextjs)
SPLINE_TYPESCRIPT	true	Generate TypeScript code
SPLINE_LAZY_LOAD	true	Use lazy loading with Suspense
SPLINE_CACHE_DIR	~/.spline-mcp/cache	Cache directory
SPLINE_MAX_CACHE_SIZE_MB	500	Maximum cache size
SPLINE_WEBSOCKET_ENABLED	true	Enable WebSocket integration
SPLINE_WEBSOCKET_URL	ws://localhost:8690	Mahavishnu WebSocket URL
SPLINE_N8N_ENABLED	true	Enable n8n integration
SPLINE_N8N_URL	http://localhost:3044	n8n server URL
SPLINE_HTTP_PORT	3048	HTTP server port
SPLINE_LOG_LEVEL	INFO	Logging level

Generated Code Examples

React Component

import { Suspense, useRef, useCallback } from 'react';
import Spline from '@splinetool/react-spline';

interface HeroSceneProps {
  className?: string;
}

export function HeroScene({ className }: HeroSceneProps) {
  return (
    <Suspense fallback={<div>Loading 3D scene...</div>}>
      <Spline
        scene="https://prod.spline.design/xxx/scene.splinecode"
        className={className}
      />
    </Suspense>
  );
}

With WebSocket Integration

// Auto-generated WebSocket integration with soft failover
const { subscribe, isConnected } = useWebSocket('ws://localhost:8690');

useEffect(() => {
  if (!isConnected) return;

  const unsubscribe = subscribe('spline:variables', (data) => {
    splineRef.current?.setVariables(data);
  });

  return unsubscribe;
}, [isConnected]);

Architecture

spline_mcp/
├── generators/         # Code generation (React, Vanilla, Next.js)
│   ├── base.py         # Base classes and types
│   ├── react.py        # React generator with FastBlocks patterns
│   ├── vanilla.py      # Vanilla JS/HTML generator
│   └── nextjs.py       # Next.js SSR generator
├── assets/             # Asset management
│   ├── manager.py      # Download, cache, validate
│   └── validator.py    # Scene file validation
├── integrations/       # External integrations
│   ├── websocket.py    # Mahavishnu WebSocket (soft failover)
│   └── n8n.py          # n8n workflow integration
├── tools/              # MCP tool definitions
│   ├── generation.py   # Code generation tools
│   ├── assets.py       # Asset management tools
│   ├── helpers.py      # Utility tools
│   └── integration.py  # Integration tools
├── config.py           # Oneiric-based configuration
└── server.py           # FastMCP application

Ecosystem Integration

Part of the Bodai Ecosystem:

Component	Role	Port
Mahavishnu	Orchestrator	8680
Akosha	Seer	8682
Dhara	Curator	8683
Session-Buddy	Builder	8678
Crackerjack	Inspector	8676
spline-mcp	3D Orchestrator	3048

License

BSD-3-Clause