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Model can now output revert_after (seconds) and revert_commands fields. Python service schedules timer from model's response, not just heuristics. Players notified of revert countdown. Revert announced when applied. Training examples: temporary gamerules with explicit/implicit/no duration, permanent changes (no revert), effects with built-in duration, combined reverts. Key principle: no duration specified → default 5 min revert for safety. "permanently"/"forever"/"always" → no revert. Effects → built-in duration, no revert_after needed. Seed dataset: 3,136 examples Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>