I Built an AI Agent That Can Watch Webpages for...

One thing has always bothered me about a lot of AI agents: they keep spending money even when nothing is happening. If you ask an agent to watch a webpage and tell you when something changes, many systems handle that in a surprisingly expensive way. They keep involving the LLM while waiting, repeatedly checking the same page, repeatedly thinking about the same unchanged state, and repeatedly burning tokens just to remain “aware.” That feels wasteful. Waiting is not reasoning. So I built a differ