Agent Harness Engineering Weekly Report — May 30, 2026
Production agent teams are sharing hands-on learnings, with benchmarks revealing 30+ point performance spreads between frameworks even on identical models. Anthropic and OpenAI have published concrete harness principles: context compression for long-running agents, a five-layer tool validation stack, and fixes for evaluation grid bugs. Meanwhile, new GitHub curated repositories are crystallizing 2026 agent engineering best practices, accelerating community adoption.
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