# Core Documentation

These files define the structural conventions that govern the pi agent system itself. They are the grammar rules — boring until you break them, then devastating.

## Concept Files

* [AGENTS.md Format Specification](agents-md-format.md) — Canonical structure and conventions for the system-level instruction file that governs agent behavior.
* [AGENTS.md Index](index-doc.md) — Overview of the cached tool documentation system and how to add new entries.
* [Pi Settings System](settings.md) — Current system configuration: providers, models, packages, subagent overrides, and runtime options.

## Change Tracking

* [Bundle Change Log](log.md) — Chronological update history.