# Pi: What It Is, How It Works, and Why It Matters

> Split into individual files for easier consumption.

## Table of Contents

- [01. What Pi Is](./01-what-pi-is.md)
- [02. Design Philosophy](./02-design-philosophy.md)
- [03. The Four Modes of Operation](./03-the-four-modes-of-operation.md)
- [04. The Architecture — How Everything Fits Together](./04-the-architecture-how-everything-fits-together.md)
- [05. The Agent Loop — How Pi Thinks](./05-the-agent-loop-how-pi-thinks.md)
- [06. Tools — How Pi Acts on the World](./06-tools-how-pi-acts-on-the-world.md)
- [07. Sessions — Memory That Branches](./07-sessions-memory-that-branches.md)
- [08. Compaction — How Pi Manages Context Limits](./08-compaction-how-pi-manages-context-limits.md)
- [09. The Customization Stack](./09-the-customization-stack.md)
- [10. Providers & Models — Multi-Model by Default](./10-providers-models-multi-model-by-default.md)
- [11. The Interactive TUI](./11-the-interactive-tui.md)
- [12. The Message Queue — Talking While Pi Thinks](./12-the-message-queue-talking-while-pi-thinks.md)
- [13. Context Files — Project Instructions](./13-context-files-project-instructions.md)
- [14. The SDK & RPC — Embedding Pi](./14-the-sdk-rpc-embedding-pi.md)
- [15. Pi Packages — The Ecosystem](./15-pi-packages-the-ecosystem.md)
- [16. Why Pi Matters — What Makes It Different](./16-why-pi-matters-what-makes-it-different.md)
- [17. File Reference — All Documentation](./17-file-reference-all-documentation.md)
- [18. Quick Reference — Commands & Shortcuts](./18-quick-reference-commands-shortcuts.md)
- [19. Building Branded Apps on Top of Pi](./19-building-branded-apps-on-top-of-pi.md)

---

*Split into per-section files for surgical context loading.*