[AI] Context Engineering for AI Coding: AGENTS.md, Cursor Rules & RAG
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In 2025, METR — an AI safety and capability research organization — ran a rigorous randomized controlled trial. Sixteen experienced open-source developers worked on 246 real-world tasks, each randomly assigned to either use AI coding tools freely or not at all. The result was counterintuitive: developers using AI tools were 19% slower on complex tasks. Before the study, those same developers predicted AI would make them 24% faster . After completing the experiment — still believing they had…
1Key Takeaways
- In 2025, METR — an AI safety and capability research organization — ran a rigorous randomized controlled trial.
- Sixteen experienced open-source developers worked on 246 real-world tasks, each randomly assigned to either use AI coding tools freely or not at all.
- The result was counterintuitive: developers using AI tools were 19% slower on complex tasks.
- Before the study, those same developers predicted AI would make them 24% faster .
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — AI reports that in 2025, METR — an AI safety and capability research organization — ran a rigorous randomized controlled trial.
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