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Harness Engineering 101: How Coding Agents Actually Work

This story is from 2026-09-24. It is preserved in the archive; the latest stories are on the live feed.

Take one model and give it 169 real bug-fixing tasks from SWE-bench Verified. Keep the weights, the tasks and the context window exactly the same. Change only the agent system that runs around the model, and you will find bug-fixing task went from 43 to 72 . That result is from a paper that went up…

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  1. 2026-09-24 20:52 · DEV Community — AI
    Harness Engineering 101: How Coding Agents Actually Work

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