vectorize-io/hindsight: Agent Memory That Learns Hits 91% on LongMemEval — 3,800 Stars With MCP Server

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Hindsight by Vectorize.io is a self-improving agent memory system that extracts structured facts, resolves entities, and builds a knowledge graph rather than storing raw text — modeling how human long-term memory works. It hit 91% on LongMemEval (state-of-the-art), and released an MCP server on March 4 that makes it a drop-in memory backend for Claude, Cursor, Windsurf, and any MCP-compatible agent via a single JSON config change. Built by Boulder startup Vectorize AI ($3.6M seed, True Ventures, 2024).