Analysis

The interesting part is who replied. Thibault Sottiaux of OpenAI answered "this is the way", which is a competitor endorsing a rival's move toward a shared standard, and the loudest pushback was that supporting AGENTS.md is bare-minimum rather than generous. Both readings point the same way: the file format is settling into a convention no single vendor owns, and the question underneath is Claude Code mods, the customisation layer this shipped on top of.