Harness Engineering: How to Build Reliable AI Agents

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​ While the entire industry obsesses over whether GPT, Claude, or Gemini is the best model, they are completely missing the real reason AI agents keep failing. The actual bottleneck isn’t the model itself, but the “harness”—the infrastructure and tools wrapped around it. Discover why top AI companies are drastically stripping down their architectures, and why mastering harness engineering is the only skill that will actually matter in 2026.

LINKS:
https://vercel.com/blog/we-removed-80-percent-of-our-agents-tools
https://openai.com/index/harness-engineering/
https://blog.langchain.com/improving-deep-agents-with-harness-engineering/
https://www.anthropic.com/engineering/effective-harnesses-for-long-running-agents

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