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What actually happens when you type a message into Claude Code? The agent loop, 40+ tools, multi-agent orchestration, and unreleased features , mapped straight from the source.

From keypress to rendered response, step by step through the source.

Watch what happens when you send a message to Claude Code

User types a message or pipes input through stdin

Keyboard input comes from Ink's TextInput component. In non-interactive mode, it reads from piped stdin instead.

Click around the source tree to explore what's inside.