SMRTR ProgrammingApr 5, 2026Daily.dev

Harness Engineering: Turning AI Agents Into Reliable Engineers

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Engineer Fran shares how harness engineering—designing systems, constraints, and feedback loops around AI agents—enabled shipping 100+ PRs monthly at Amazon. Unlike prompt engineering's single interactions, harness engineering creates reliable production environments through deterministic scripts, validation guardrails, state management, and structured documentation that prevent AI agents from breaking code while maintaining output quality.

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