AAS LanceDB MCP Server

A comprehensive Model Context Protocol (MCP) server that provides AI agents with database-like operations over LanceDB with automatic embedding generation using state-of-the-art BGE-M3 multilingual embeddings.

✨ Why This MCP Server?

• 🎯 Database-like Interface: Works like SQLite MCP - create tables, CRUD operations, migrations
• 🤖 Automatic Embeddings: BGE-M3 generates 1024D multilingual embeddings for searchable text
• 🔍 Semantic Search: Natural language search across your data using vector similarity
• 📊 Rich Resources: Dynamic database inspection (schemas, samples, statistics)
• 💡 Intelligent Prompts: AI guidance for schema design, optimization, troubleshooting
• 🛡️ Safe Migrations: Built-in table migration with validation and automatic backups
• 🌍 Multilingual: BGE-M3 provides excellent performance across 100+ languages

🚀 Quick Start

Install & Run with uvx (Recommended)

# Run directly without installation
uvx aas-lancedb-mcp --help

# Or install globally
uv tool install aas-lancedb-mcp
aas-lancedb-mcp --version

Install from Source

git clone https://github.com/applied-ai-systems/aas-lancedb-mcp.git
cd aas-lancedb-mcp
uv tool install .

🛠️ MCP Capabilities Overview

🔧 10 Database Tools

Tool	Purpose	Example
create_table	Create tables with schema	Create products table with searchable descriptions
list_tables	Show all tables	Get overview of database contents
describe_table	Get table schema & info	Understand table structure and metadata
drop_table	Delete tables	Remove unused tables
insert	Add data (auto-embeddings)	Insert product with searchable description
select	Query with filtering/sorting	Find products by price range
update	Modify data (auto-embeddings)	Update product info with new description
delete	Remove rows by conditions	Delete discontinued products
search	Semantic text search	"Find sustainable products" → matches related items
migrate_table	Safe schema changes	Add columns or change structure safely

📁 Dynamic Resources

Resources provide AI agents with real-time database insights:

• lancedb://overview - Complete database statistics and table summary
• lancedb://tables/{name}/schema - Table schema, columns, searchable fields
• lancedb://tables/{name}/sample - Sample data for understanding contents
• lancedb://tables/{name}/stats - Column statistics, data quality metrics

💬 5 Intelligent Prompts

AI-powered guidance for database operations:

• analyze_table - Generate insights about data patterns and quality
• design_schema - Help design optimal table schemas for use cases
• optimize_queries - Performance optimization recommendations
• troubleshoot_performance - Diagnose and solve database issues
• migration_planning - Plan safe schema migrations step-by-step

📋 Usage Examples

Creating a Product Catalog

{
  "tool": "create_table",
  "arguments": {
    "schema": {
      "name": "products", 
      "columns": [
        {"name": "title", "type": "text", "required": true, "searchable": true},
        {"name": "description", "type": "text", "searchable": true},
        {"name": "price", "type": "float", "required": true},
        {"name": "category", "type": "text", "required": true},
        {"name": "metadata", "type": "json"}
      ],
      "description": "E-commerce product catalog with semantic search"
    }
  }
}

Adding Products (Embeddings Generated Automatically)

{
  "tool": "insert", 
  "arguments": {
    "data": {
      "table_name": "products",
      "data": {
        "title": "Eco-Friendly Water Bottle", 
        "description": "Sustainable stainless steel water bottle with insulation",
        "price": 24.99,
        "category": "sustainability",
        "metadata": {"brand": "EcoLife", "material": "stainless_steel"}
      }
    }
  }
}

Semantic Search (Natural Language)

{
  "tool": "search",
  "arguments": {
    "query": {
      "table_name": "products",
      "query": "environmentally friendly drinking containers",
      "limit": 5
    }
  }
}

Database Inspection (Resources)

{
  "resource": "lancedb://tables/products/sample"
}

Returns sample product data for AI agents to understand the table structure.

AI Guidance (Prompts)

{
  "prompt": "design_schema",
  "arguments": {
    "use_case": "Customer support ticket system",
    "data_types": "ticket text, priority levels, timestamps", 
    "search_requirements": "semantic search across ticket descriptions"
  }
}

Returns AI-generated recommendations for optimal table design.

⚙️ Configuration

Claude Desktop Setup

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "aas-lancedb": {
      "command": "aas-lancedb-mcp",
      "args": ["--db-uri", "~/my_database"],
      "env": {
        "EMBEDDING_MODEL": "BAAI/bge-m3"
      }
    }
  }
}

Environment Variables

export LANCEDB_URI="./my_database"      # Database location
export EMBEDDING_MODEL="BAAI/bge-m3"    # Embedding model (default)
export EMBEDDING_DEVICE="cpu"           # cpu or cuda

Command Line Options

aas-lancedb-mcp --help                   # Show help
aas-lancedb-mcp --version                # Show version  
aas-lancedb-mcp --db-uri ./my_db         # Custom database path

🏗️ Architecture

Enhanced MCP Server Architecture
├── 🔧 Tools (10)           - Database operations (CRUD, search, migrate)
├── 📁 Resources (dynamic)   - Real-time database introspection  
├── 💬 Prompts (5)          - AI guidance for database tasks
├── 🤖 BGE-M3 Embeddings    - Automatic 1024D multilingual vectors
├── 🛡️ Safe Migrations      - Schema evolution with validation
└── 📊 Rich Metadata        - Column types, constraints, statistics

Key Technical Features

• 🎯 Database-like Interface: Familiar SQL-style operations hiding vector complexity
• 🤖 Automatic Embedding Generation: BGE-M3 creates vectors for searchable text columns
• 🔍 Hybrid Search: Combine semantic similarity with traditional filtering
• 📊 Dynamic Resources: Real-time database inspection for AI agents
• 💡 Contextual Prompts: AI guidance using actual database state
• 🛡️ Migration Safety: Backup, validate, and rollback capabilities
• 🌍 Multilingual: BGE-M3 excels across 100+ languages

🧪 Development & Testing

# Clone and setup
git clone https://github.com/applied-ai-systems/aas-lancedb-mcp.git
cd aas-lancedb-mcp

# Install dependencies
uv sync --all-extras

# Run tests
uv run pytest

# Run tests with coverage  
uv run pytest --cov=src --cov-report=term-missing

# Format and lint
uv run ruff format .
uv run ruff check .

# Test CLI
uv run aas-lancedb-mcp --help

🚀 Performance & Scalability

• BGE-M3 Embeddings: 1024 dimensions, excellent multilingual performance
• LanceDB Backend: Columnar vector database optimized for scale
• Efficient Operations: Automatic embedding caching and batch processing
• Memory Management: Lazy loading and streaming for large datasets
• Search Performance: HNSW indexing for fast vector similarity search

🤝 Contributing

1. Fork the repository
2. Create feature branch (git checkout -b feature/amazing-feature)
3. Make changes with tests (pytest tests/)
4. Format code (uv run ruff format .)
5. Submit Pull Request

📄 License

MIT License - see LICENSE file for details.

🙏 Acknowledgments

• LanceDB - High-performance columnar vector database
• BGE-M3 - State-of-the-art multilingual embeddings
• Model Context Protocol - Standardized AI tool integration
• Sentence Transformers - Easy-to-use embedding framework

📚 Related MCP Projects

• MCP Servers - Official MCP server collection
• FastMCP - Fast Pythonic MCP framework
• SQLite MCP - Database MCP inspiration

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Ready to supercharge your AI agents with powerful database capabilities? 🚀

uvx aas-lancedb-mcp --help