CocoIndex Code

An MCP (Model Context Protocol) server for indexing and querying codebases using CocoIndex.

Features

• Semantic Code Search: Find relevant code using natural language queries
• Incremental Indexing: Only re-indexes changed files for fast updates
• Multi-Language Support: Python, JavaScript/TypeScript, Rust, Go
• Vector Embeddings: Uses sentence-transformers for semantic similarity
• SQLite Storage: Portable, no external database required

Installation

pip install cocoindex-code

Or with uv:

uv pip install cocoindex-code

Usage with Claude Code

Add to your Claude Code MCP configuration (.claude/mcp_config.json):

{
  "mcpServers": {
    "cocoindex-code": {
      "command": "cocoindex-code",
      "env": {
        "COCOINDEX_CODE_ROOT_PATH": "/path/to/your/codebase"
      }
    }
  }
}

Or without explicit path (auto-discovers from current directory):

{
  "mcpServers": {
    "cocoindex-code": {
      "command": "cocoindex-code"
    }
  }
}

Configuration

Environment variables:

Variable	Description	Default
COCOINDEX_CODE_ROOT_PATH	Root path of the codebase	Auto-discovered (see below)
COCOINDEX_CODE_EMBEDDING_MODEL	Embedding model to use	sentence-transformers/all-MiniLM-L6-v2

Root Path Discovery

If COCOINDEX_CODE_ROOT_PATH is not set, the codebase root is discovered by:

1. Finding the nearest parent directory containing .cocoindex_code/
2. Finding the nearest parent directory containing .git/
3. Falling back to the current working directory

MCP Tools

query

Search the codebase using semantic similarity.

query(
    query: str,               # Natural language query or code snippet
    limit: int = 10,          # Maximum results (1-100)
    offset: int = 0,          # Pagination offset
    refresh_index: bool = True  # Refresh index before querying
)

The refresh_index parameter controls whether the index is refreshed before searching:

• True (default): Refreshes the index to include any recent changes
• False: Skip refresh for faster consecutive queries

Returns matching code chunks with:

• File path
• Language
• Code content
• Line numbers (start/end)
• Similarity score

Index Storage

The index is stored in .cocoindex_code/ under your codebase root:

your-project/
├── .cocoindex_code/
│   ├── target_sqlite.db  # Vector index (SQLite + sqlite-vec)
│   └── cocoindex.db/     # CocoIndex state
├── src/
│   └── ...

Add .cocoindex_code/ to your .gitignore.

Supported File Types

• Python: .py, .pyi
• JavaScript: .js, .jsx, .mjs, .cjs
• TypeScript: .ts, .tsx
• Rust: .rs
• Go: .go

Common generated directories are automatically excluded:

• __pycache__/
• node_modules/
• target/
• dist/
• build/
• .git/

Development

Local Testing with Claude Code

To test locally without installing the package, use the Claude Code CLI:

claude mcp add cocoindex-code \
  -- uv run --project /path/to/cocoindex-code cocoindex-code

Or add to .mcp.json in your project root:

{
  "mcpServers": {
    "cocoindex-code": {
      "command": "uv",
      "args": ["run", "--project", "/path/to/cocoindex-code", "cocoindex-code"]
    }
  }
}

Running Tests

# Install dev dependencies
uv sync --group dev

# Run tests
uv run pytest tests/ -v

# Run pre-commit hooks
uv run pre-commit run --all-files

License

MIT