Grade subagent output with a blind rubric in a separate context window (Anthropic 'Outcomes')

ClaudeAINews·high signal

Anthropic's Performance Outcomes attaches a grader that scores each subagent's result against an explicit rubric ('all tests pass, no new TODOs, no public API changes') in a fresh context window that never saw the worker's reasoning, so it judges the output on its own terms instead of being anchored to the process. Failures bounce the subagent back to revise. It raised internal task-success up to 10 points and lifted document-generation quality 8.4% (Word) and 10.1% (PowerPoint).