WindTools MCP Server

MCP Server for the WindTools code assistant, providing document embedding and retrieval capabilities using ChromaDB and
sentence transformers.

Features

- Semantic Code Search: Uses sentence transformers for embedding code snippets and retrieval
- Code Repository Indexing: Automatically indexes code files from specified directories
- Persistent Storage: Saves code embeddings in ChromaDB for persistent retrieval
- Directory Exploration: Built-in tools for navigating and exploring codebases
- Background Initialization: Loads resources asynchronously to minimize startup time
- Environment Configuration: Configurable through environment variables

Tools

1. list_dir
- List the contents of a directory
- Inputs:
- directory_path (string): Path to list contents of, should be absolute path to a directory
- Returns: JSON string containing directory information including file types and sizes

2. get_initialization_status
- Check the status of the background initialization process
- Returns: JSON string with initialization status of ChromaDB and embedding model

3. index_repository
- Index code files from specified directories into ChromaDB
- Inputs:
- target_directories (array of strings): List of absolute paths to directories to index
- force_reindex (boolean, optional): If true, reindex all files even if they already exist in the index
- Returns: JSON string containing indexing statistics and results

4. codebase_search
- Find code snippets relevant to a search query
- Inputs:
- query (string): Search query describing what you're looking for
- limit (integer, optional): Maximum number of results to return (default: 10)
- min_relevance (float, optional): Minimum relevance score threshold (0.0 to 1.0)
- Returns: JSON string containing search results with relevant code snippets

Technical Architecture

The WindTools MCP Server is built on these key components:

- ChromaDB: Vector database for storing and retrieving code embeddings
- Sentence Transformers: Deep learning models for creating embeddings from code
- FastMCP: Framework for building MCP-compliant servers
- Async Lifespan Management: Efficient resource initialization and cleanup

Initialization Process

The server initializes ChromaDB and the embedding model in the background, allowing it to start accepting requests
immediately while resource loading continues in the background. The get_initialization_status tool can be used to
check if the initialization is complete.

Setup

Environment Variables

The server can be configured with the following environment variables:

- DATA_ROOT: Absolute directory where ChromaDB database and model cache will be stored (default: a 'data' directory
inside the package)
- CHROMA_DB_FOLDER_NAME: Name of the folder where ChromaDB stores data (default: "default")
- SENTENCE_TRANSFORMER_PATH: Path to the sentence transformer model (default: "jinaai/jina-embeddings-v2-base-code")

Installation

Using pip

pip install windtools-mcp

From source

git clone https://github.com/ZahidGalea/windtools-mcp
cd windtools-mcp
pip install -e .

Usage with Claude Desktop

Add the following to your claude_desktop_config.json:

Direct Execution

Using Python 3.11 as ChromaDB has issues with newer Python versions.

{
  "mcpServers": {
    "windtools": {
      "command": "uvx",
      "args": [
        "-p",
        "3.11",
        "-U",
        "windtools-mcp"
      ],
      "env": {
        "DATA_ROOT": "/Users/<user>/windtools_data",
        "CHROMA_DB_FOLDER_NAME": "chromadb",
        "SENTENCE_TRANSFORMER_PATH": "jinaai/jina-embeddings-v2-base-code"
      }
    }
  }
}

Data (including ChromaDB database and model cache) will be saved in the /Users/<user>/windtools_data directory and
persist between container executions.

Development

Requirements

- Python 3.11
- Dependencies listed in pyproject.toml

Development Setup

For developing:

```bash