Joanna Wang is a senior software engineer at <a href="https://www.sixfold.ai")>Sixfold</a>, where the team builds AI underwriting tools that help insurance companies gather data and assess risk. She came to Ruby on Rails after working across Java, Go, Python, and Node.
Robby and Joanna get into why the homegrown orchestration they built on state machines and callbacks turned brittle, what moving to Hatchet changed, and the tradeoffs of leaning on a gem that is no longer maintained. They also talk about what happened when the team went fully agentic, and why Rails magic is easier to understand when an agent can trace it for you.
Links:
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source & further reading
rubyonrails.org — original article
Agents on Rails: Grok 4.6, GLM 5.3, Gemini 3.7 Flash, and Opus 4.8
Agents on Rails, query method and more
Rails Is Built for AI