Iwsdk MCP

IWSDK MCP Server

RAG-powered Model Context Protocol server for Immersive Web SDK development

Setup

Prepare the RAG System

# Clone the IWSDK repository (if you don't have it)
git clone https://github.com/meta-quest/immersive-web-sdk.git

# Prepare the RAG system (single command)
npm run prepare /path/to/immersive-web-sdk

This single command prepares the complete RAG (Retrieval Augmented Generation) system by:

1. Ingesting IWSDK source code - Extracts components, systems, types, examples from the SDK
2. Fetching official documentation - Downloads official IWSDK docs from Meta's developer portal
3. Building the project - Compiles TypeScript to JavaScript

Telemetry

The MCP server automatically logs all tool calls to telemetry.jsonl for usage tracking and debugging. Each line contains:

• timestamp - ISO 8601 timestamp
• tool - Tool name that was called
• params - Parameters passed to the tool (long strings truncated to 500 chars)

The telemetry file is excluded from git via .gitignore.

Example telemetry entry:

{
  "timestamp": "2025-11-15T21:18:25.883Z",
  "tool": "get_component_schema",
  "params": { "componentName": "OneHandGrabbable" }
}

Configuration

After running npm run prepare, configure the MCP server in your client:

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

Tools

The MCP server provides 18 tools organized by category:

Documentation & Reference:

• get_api_documentation - Query API documentation for classes/methods
• get_component_schema - Get component field definitions with JSDoc, requirements, and relationships
• get_system_info - Get system documentation with methods, properties, and queried components
• search_code_examples - Find relevant code examples
• explain_concept - Get explanations of IWSDK concepts
• lookup_package_exports - List all exports from a package

Code Generation:

• generate_system_template - Generate boilerplate for custom ECS systems
• scaffold_project - Generate complete project structure
• compose_feature - Compose complete feature implementations with all necessary components/systems
• find_similar_code - Find similar code examples by description

Validation & Troubleshooting:

• validate_code - Validate code against best practices and detect missing components/systems
• get_validation_rules - Get validation rules for components/systems
• check_component_order - Check correct component ordering constraints
• get_common_mistakes - Search common mistakes with wrong/correct code examples

Implementation Guides:

• find_implementation_pattern - Get implementation guides for common features
• get_setup_guide - Get project setup instructions
• explain_asset_pipeline - Get asset handling guidance
• get_best_practices - Get recommended patterns and anti-patterns
• troubleshoot_error - Get diagnostic steps for errors