daily.dev built a 29K-line internal AI agent in four days with Codex, then spent the next few weeks dealing with the real problems after launch like leaked credentials,.
WaffleFries 
The four-day build is the least interesting metric here because the real bottleneck was missing blast-radius controls, and I’d split the “agent” into a thin orchestrator plus sandboxed tools before adding more prompts.
Quelly
