Architect Practice

Jul 6, 2026 · Artificial Intelligence

How Cursor Retrieves a Specific Function from a 50,000‑File Repo in Under a Second

The article dissects Cursor's dual‑index architecture—semantic vector search built on AST chunking and a custom‑trained embedding model, plus a local trigram regex index—explaining how Merkle trees, team index reuse, and file‑based context delivery enable sub‑second code retrieval in massive monorepos.