The SDL multimedia library (part of the Steam Runtime, used by thousands of games) added a formal policy banning AI/LLM-generated code contributions via PR template and AGENTS.md file. The policy cites licensing uncertainty — AI-generated code may contain snippets from unknown sources incompatible with the Zlib license — and that AI frequently hallucinates non-existent issues. The move sparked 23 HN points and growing debate about AI code provenance in open source.