Prompt Engineering Evolution Timeline
Trace the historical development of prompt engineering techniques and tools from 2020 to present, with key milestones and methodologies.
Prompt
Trace the evolution of prompt engineering from 2020 to 2025. I want to understand how best practices have changed with GPT-2 → GPT-4 → GPT-4 Turbo, how agents and retrieval-augmented generation have influenced prompt design, and which tools (e.g., LangChain, PromptLayer) shaped the ecosystem. Add timelines, milestones, and voices from the field.