It is perfectly allowed to ignore this as long as you do not plan to send AI-generated changes to Haiku upstream for review. Haiku is open source project, so everyone can make code changes with any tool and share that changes with others. AGENTS.md is not a license and it have no legal force. If such requirement will be added to license, Haiku will stop being open source and will move to “source available” category according to OSI definitions.
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