I spent this weekend building Setback for Google's All Things Agentic Hackathon: a tool that turns a resident's plain-language objection to a nearby development application into a real, legally-relevant council submission, and just as importantly, honestly refuses the parts that aren't. Disclosure: this was created for entering that hackathon, and most of the actual typing was done by AI coding agents that I orchestrated rather than by me line-by-line. That's the part I actually want to write ...