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🐙 Guides, papers, lessons, notebooks and resources for prompt engineering, context engineering, RAG, and AI Agents.

Comprehensive AI prompt engineering skills for Claude Code, ChatGPT (GPTs & Codex CLI plugin), and Gemini Gems. Model-specific patterns for Claude Fable 5 / Opus 4.8, GPT-5.6 Sol (5.5/5.4 legacy), Gemini 3.1, Veo 3.1, Nano Banana 2, and gpt-image-2.