lumen Claude Code Plugin

Lumen is a plugin that adds local semantic code search to AI coding agents such as Claude Code, Cursor, Codex, and OpenCode, exposed through an MCP server. According to its README, it parses source files with Go's native AST parser and tree-sitter grammars for other languages, breaks them into semantic chunks, and generates embeddings using a locally run Ollama or LM Studio model. Those embeddings are stored in a local SQLite database with the sqlite-vec extension and queried with nearest-neighbor search when the agent calls a semantic_search tool. The README states that no cloud services, external databases, or API keys are involved, so indexing and search happen entirely on the user's machine. The README also reports benchmark results across nine languages showing reduced cost, time, and output-token usage compared with not using the plugin, while patch quality was reported as maintained.