The 5 Hidden Background Systems
Every time you talk to Claude Code, five invisible agents run alongside your conversation. They extract memories, consolidate knowledge, predict your next move, and answer side questions — all without you noticing. This chapter reveals exactly how they work, with the actual prompts from the source code.
The Hidden Systems
Claude Code forks sub-agents that run alongside the main conversation. They handle memory, predictions, and side-tasks without you ever seeing them. Together they add only ~7% to your costs while making the experience dramatically better.
After every response you send, an invisible background agent reads the conversation and saves important facts about you into markdown files. It learns your role, your preferences, what corrections you made, and what projects you are working on. These memories persist across sessions — so next time you talk to Claude Code, it already knows who you are.
Pulls facts from every conversation turn into memory files