Local-first semantic-memory and knowledge-graph server for AI agents. Rust + hybrid RAG retrieval, temporal facts, human-in-the-loop governance, append-only audit chain. Self-hosted, offline-first, zero per-query cost, no LLM in the loop. OpenAI-compatible API, MCP server.
**A local-first semantic memory and knowledge-graph server for AI agents. No cloud, no per-query cost, no LLM in the loop.** Brain Server gives your agent a second brain that lives on your own device. It is written in Rust and wraps a deterministic retrieval engine, a static local embedding model, and a knowledge graph behind a versioned HTTP API. Recall never calls an LLM or an embedding API, so every query costs nothing and the data never leaves the machine.