Reading Anthropic's retail agent example changed six things in ArcKit in one day

mcraddock · x · 2026-09-03

A pattern you can turn into a check is a rule; one you can't is a preference. The author shows how Anthropic's worked example of two Claude agents for online retail — one helping a shopper, one helping the shop — shares deep structure with ArcKit (an agent producing sign-off documents for architects): both put a model in front of text it shouldn't trust and ask for output people will rely on. Reading it changed six things in ArcKit in a single day; the post details what was learnt and changed.

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