Fighter's World

Mar 28, 2026 · Artificial Intelligence

What Engineering Decisions Make AI Coding Agents Effective? Lessons from the OpenDev Paper

The article dissects OpenDev’s open‑source AI coding agent, comparing its scaffolding‑vs‑harness architecture, cognitive‑flow design, context‑compression strategies, tool‑reliability mechanisms and safety layers with Claude Code, Cursor, Codex and Augment, and shows that harness‑level engineering remains the biggest performance lever even for frontier models.