# ECHO

> ECHO is an opinionated cognitive command system for AI chatbots. It kills the Amnesia Tax, governs operator bandwidth, and turns chat sessions into a durable working system.

## Pages

- [Home](/): What ECHO is and why it exists.
- [About the ECHO System](/about): Philosophy and origin of the operator system.
- [ECHO System Architecture](/echo-architecture): Modes, loops, gates, and the operator record.
- [ECHO Gearbox](/gearbox): Browse modes, loops, and trials.
- [ECHO Session Simulator](/echo-demo): Run a simulated ECHO session.
- [ECHO Genesis Timeline](/timeline): The evolution of ECHO.
- [The ECHO Universe](/universe): The full ECHO ecosystem.
- [Build Your AI OS — Course](/ai-os-course): Free six-unit course to install your own AI OS.
- [ECHO-X — Quartermaster HUD](/echo-x): Chrome HUD overlay for ECHO.
- [Antigravity Media](/antigravity): Apps, scripts, AI rooms, games, and screenplays.
- [System Docs](/system-docs): Protocols, primitives, and operating notes.

## Optional

- [8:12 Theory](/812): Companion site for the 8:12 screenplay.