{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Repo: anthropics/single-agent-loop-kit","description":"Anthropic repo signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/01244c81-9c9b-45c0-a061-027d0af87471","json_url":"https://onlylabs.fyi/signals/01244c81-9c9b-45c0-a061-027d0af87471/signal.json","generated_at":"2026-10-24T20:23:21.766Z","evidence_latest_fetched_at":"2026-10-23T07:04:08.360295+00:00","signal_first_seen_at":"2026-10-23T07:00:42.154125+00:00","org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab","category_label":"Frontier lab","dossier_url":"https://onlylabs.fyi/labs/anthropic","dossier_json_url":"https://onlylabs.fyi/labs/anthropic/dossier.json"},"related_urls":{"signal":"https://onlylabs.fyi/signals/01244c81-9c9b-45c0-a061-027d0af87471","signal_json":"https://onlylabs.fyi/signals/01244c81-9c9b-45c0-a061-027d0af87471/signal.json","source":"https://github.com/anthropics/single-agent-loop-kit","lab_dossier":"https://onlylabs.fyi/labs/anthropic","lab_dossier_json":"https://onlylabs.fyi/labs/anthropic/dossier.json","analysis":"https://onlylabs.fyi/analysis/anthropic","analysis_json":"https://onlylabs.fyi/analysis/anthropic/analysis.json","analysis_evidence_json":"https://onlylabs.fyi/analysis/anthropic/evidence.json","category":"https://onlylabs.fyi/frontier","category_json":"https://onlylabs.fyi/frontier.json","category_feed":"https://onlylabs.fyi/frontier/feed.xml","category_signals_json":"https://onlylabs.fyi/signals.json","topic":null,"topic_signals_json":null,"topic_feed":null,"data_business":null},"answer_pack":{"answer":"Anthropic published anthropics/single-agent-loop-kit (Python). 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It is the companion to the article [Building agents: When to fold subagents into your main agent loop](https://claude.com/resources/articles/building-agents-when-to-fold-subagents-into-your-main-agent-loop). > **Reference implementation. Not maintained and not accepting contributions.** The kit does not assume a single loop always wins. It measures. Every change is scored on the same eval before and after, and a subagent only goes away when the numbers say its replacement holds. The idea 1. **Measure.** Find the evals you already have, fill the gaps, and score the system as it is today. 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