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Lien (French for 'link') provides AI coding assistants with deep understanding of your codebase through 100% local and private semantic search. It indexes your code using local embeddings, serving context via the Model Context Protocol (MCP) to tools like Cursor and Claude Code. Developers can find code by meaning, check impact before refactoring, surface complexity hotspots, and analyze technical debt, all without sending any proprietary code externally. It supports cross-repository search with a Qdrant backend and offers comprehensive code metrics.