You test your code. Why aren’t you testing your AI instructions?

Why aren't you testing your AI instructions? Why instruction quality matters than model choice, and a tool to measure it. Every team using AI coding tools writes instruction files. CLAUDE.md for Claude Code, AGENTS.md for Codex, copilot-instructions.md for GitHub Copilot,.cursorrules for Cursor. You spend time crafting these files, change a paragraph, push it, and hope for the best. Your AI instructions have hope. I built agenteval to fix that. The variable nobody is testing A recent study tested three agent frameworks running the same model on 731 coding problems. Same model. Same tasks.