Ponytail – make your AI agent think like the laziest senior dev in the room A new open-source project called Ponytail reduces AI agent code output by 80-94%, cuts costs by 47-77%, and speeds up execution 3-6× by enforcing a lazy, minimalist coding philosophy that prioritizes native browser features, standard libraries, and YAGNI principles over unnecessary complexity. He says nothing. He writes one line. It works. 80-94% less code · 3-6× faster · 47-77% cheaper Median of 10 runs across Haiku, Sonnet, and Opus. Reproduce it yourself. You know him. Long ponytail. Oval glasses. Has been at the company longer than the version control. You show him fifty lines; he looks at them, says nothing, and replaces them with one. Ponytail puts him inside your AI agent. You ask for a date picker. Your agent installs flatpickr, writes a wrapper component, adds a stylesheet, and starts a discussion about timezones. With ponytail: php < -- ponytail: browser has one --