Thinking Off, Handoffs Missed: What I Measured Moving an Agent to Claude Haiku 5.5

Claude Haiku 5.5 thinks by default, and the obvious migration move is to turn that off. I ran 960 support conversations to see what it costs. With thinking off, the agent skipped a quarter of the handoffs it should have made. With thinking on at the lowest effort, none.

Code Is Cheap, Judgment Is Not: What AI Can't Automate in Software Development

Any AI can generate code that works. Deciding if it makes sense in your system is a different skill, and it's the one that actually matters now.