Synapse indexes your codebase locally and feeds it to Claude over MCP

Synapse is a new local code indexer and MCP server for Claude Code. It watches your project folders, indexes files on your machine, and hooks into the agent so it knows your code structure without you pasting snippets by hand. Per the Show HN writeup, without this Claude keeps re-asking about your stack and conventions.

Setup runs about two minutes: pip install synapse-mcp, then synapse init and one line in the config. The index lives locally in LanceDB, no API key required. Local embeddings run on nomic-embed-text-v1.5, which pulls down roughly 400 MB on first launch.

Synapse works with Claude Code, Cursor, and Continue over MCP, and reindexes files in real time on save. Claude Desktop chat support via SSE is planned for version 0.2. The project is MIT-licensed and needs Python 3.10+ and 1 GB of disk.