Claude Code Auto-Memory overview

Claude Code's file-based auto-memory system. Automatically extracts salient facts, preferences, and project-specific knowledge from conversations and persists them to MEMORY.md files under ~/.claude/projects/<hash>/memory/. The MEMORY.md index file links to per-topic memory files. Background consolidation (auto-dream) runs post-session to merge, deduplicate, and reorganize extracted memories. Memory is scoped at both project and user levels, with project-level CLAUDE.md providing instruction memory and user-level MEMORY.md providing learned-context memory. Security validation rejects path traversal, null bytes, UNC paths, and drive-root writes.