AI Architecture Updates: April 30, 2026

1. Martin Fowler’s April 29 Fragments: AI Coding, Harness Engineering, and Function Length

Martin Fowler. Fowler’s latest “fragments” roundup highlights Chris Parsons’ updated AI-coding guide (“the game is not ‘how fast can we build’ any more — it is ‘how fast can we tell whether this is right’”), Birgitta Böckeler on harness engineering and “computational sensors” as the new architectural primitive around AI agents, Adam Tornhill on function length in the AI era, and Nilay Patel’s “software brain” framing. Read together, the picks sketch an emerging consensus: the interesting design surface has moved from the model to the harness around it, and code-quality heuristics need to be rewritten for an environment where humans verify rather than author the bulk of changes. Source