Make AGENTS.md play nice with Claude Code

[ogajduse]

How does it play with Claude Code? There is an open feature request 6235 in https://github.com/anthropics/claude-code/ (intentionally not linking the issue directly) for Claude Code to support AGENTS.md.

We can approach it as many others did: Adyen/adyen-ios@ee2f14a

Originally posted by @ogajduse in #20228 (comment)