[AI] Context Engineering for AI Coding: AGENTS.md, Cursor Rules & RAG

A 2025 METR study revealed that experienced developers using AI coding tools were 19% slower on complex tasks, despite predicting a 24% increase in speed. This gap highlights a disconnect between subjective confidence and actual performance. To improve AI agent utility, AGENTS.md provides a tool-agnostic Markdown file at the repository root. This file acts as a dedicated briefing for agents like Claude Code or Cursor, detailing project conventions, build processes, and critical constraints for better context.