letta-ai/claude-subconscious: Persistent Background Memory Agent for Claude Code — 1.3K Stars

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Letta AI released claude-subconscious, an extension that gives Claude Code a persistent memory layer operating in the background across sessions. It uses four Claude Code hooks (SessionStart, UserPromptSubmit, PreToolUse, Stop) to watch sessions, read files, build up memory over time, and inject contextual guidance via stdout — never modifying CLAUDE.md. Supports whisper (messages only), full (blocks + messages), or off modes with multi-project shared memory. Represents a new architecture pattern: background agents augmenting primary coding agents with persistent context.