How Codex reads AGENTS.md, and how to layer it so the right rules win

Wed, 30 Sep 2026 17:00:00 +0000

Codex reads instructions from AGENTS.md files before it starts work, and it doesn’t read just one. It builds a chain of them, in a documented order, and the order decides which rule wins when two disagree. If you’ve ever had Codex ignore a rule you were sure you’d written down, the layering is the first place to look.

Monorepo on Tokenise

How Codex reads AGENTS.md, and how to layer it so the right rules win