5 layers to the ai stack.

Every AI builder needs five layers in their stack. Most people know two, maybe three. Here's the full agent stack. First, the agent harness thinks something like Claude code or cursor that manages your agents in one place. Next is the search layer. This includes tools like perplexity or exa that go and find information for you. Third is the web data layer. This is the most underutilized layer. One API call from a tool like fire crawl scrapes, crawls, and extracts clean data from almost any site. Fourth is the offspring, something like obsidian or notion, to store context, notes, and memory. And finally, there is the outbound layer where tools like instantly or Apollo can be used for