Anthropic killed the AI agent stack | Claude Code Skills explained (29K engineers)

Join Agent Skills Academy — https://www.skool.com/agentskillsacademy/about Twenty-nine thousand engineers paid me on Udemy to teach the complex AI stack — LangChain, RAG, multi-agent systems. Twenty years senior engineer at IBM Watson and Nike. 4.5 stars across 700+ reviews. Adobe Stock contributor. Then in late 2025, Anthropic shipped SKILL.md — a five-line text file that made the whole complex stack optional. This Short is the proof — the actual file, the actual command, the actual newsletter draft it writes in 40 seconds. No code. No API. No agency. Plain English instructions Claude reads. In the Foundation course (free) inside Agent Skills Academy on Skool, you build your first working SKILL.md by Saturday. No Python required.\n\nJoin free — https://www.skool.com/agentskillsacademy/about