AI Engineering/Phase 13/Lesson 22

Skills and Agent SDKs — Anthropic Skills, AGENTS.md, OpenAI Apps SDK

MCP says "what tools exist." Skills say "how to do a task." The 2026 stack layers both. Anthropic's Agent Skills (open standard, December 2025) ship as SKILL.md with progressive disclosure. OpenAI's Apps SDK is MCP plus widget metadata. AGENTS.md (now in 60,000+ repos) sits at the repo root as project-level agent context. This lesson names what each covers and builds a minimal SKILL.md + AGENTS.md bundle that travels across agents.

Learn 45 min Python (stdlib, SKILL.md parser and loader)

Prerequisites: Phase 13 · 07 (MCP server)

#Learning Objectives

Distinguish the three layers: AGENTS.md (project context), SKILL.md (reusable know-how), MCP (tools).
Write a SKILL.md with YAML frontmatter and progressive disclosure.
Load skills filesystem-style into an agent runtime.
Compose a skill with an MCP server and an AGENTS.md so one package works in Claude Code, Cursor, and Codex.

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The text and code of this lesson are based on AI Engineering from Scratch by Rohit Ghumare, MIT licensed.