Result Loops let an agent score its own output against a JSON rubric and retry until the score passes, public beta since 2026-05-06 Pattern 1 is a blog rubric I run on every draft: TLDR present, four H2s, no banned words, ~14% retry rate Pattern 2 is a code-PR rubric that gates on tests, lint, and types before a human ever sees the diff Patterns 3 to 5 cover email tone, image-prompt structure, and bug-triage completeness with the same retry shape Honest cost note: every retry is real tokens, so cap iterations and set the threshold low enough that you actually exit I have been running Anthropic's Result Loops in private beta for about three weeks. Last Tuesday it went public. Here is what I actually use it for and what it cost me to learn the difference between a good rubric and a rubric that loops forever.…