AI Step-by-Step

May 1, 2026 · Artificial Intelligence

How Claude Code’s Agentic Loop Works: Four Layers from QueryEngine to UI

The article breaks down Claude Code’s persistent agentic loop into four layers—QueryEngine, Tool System, Permission/Hook, and React + Ink—explaining how each turn gathers context, makes model decisions, executes actions, verifies results, handles errors, and renders a terminal UI.