Meet EverOS: An Open Source Markdown-First Agent Memory Runtime With Hybrid BM25 + Vector Retrieval and Self-Evolving Skills

EverMind has released EverOS, an open-source memory runtime for AI agents. It ships under an Apache 2.0 license. It targets a problem agent builders hit early: large language models are stateless. The conversation ends, and the context is gone.

EverOS proposes a different substrate. Instead of locking memory inside a vector database, it writes memory as plain Markdown files. Those files become the source of truth that agents read, edit, and search across sessions.

TL;DR

EverOS stores agent memory as editable Markdown, indexed by SQLite and LanceDB.

Hybrid retrieval blends BM25, vector search, and scalar filtering in one query.