What's the difference between automation (Zapier, n8n, Make) and AI agents?

Tools like Zapier, Make, and n8n run fixed recipes you design in advance: when X happens, do Y, then Z, the same steps every single time, which makes them cheap and reliable. An AI agent adds a language model that can read the situation, make decisions, and choose its own next steps, which makes it flexible but also slower, pricier, and less predictable. Most founders actually need a plain workflow with one smart AI step inside it (e.g. 'summarize this email' or 'draft a reply'); save true agents for tasks that genuinely require judgment.

A quick orientation. The real value is below: resources worth your time, from people who've actually done it.