Coding Agents Need Verification Beyond Line Review - Willison

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Developer and blogger Simon Willison argued on 22 August 2026 that the essential skill for productive use of coding agents is not reading every line they write, but being able to confidently instruct them and then verify that changes were applied correctly.

In a short note on his weblog, Willison wrote that “eyeballing every line of code has never been the most effective way to validate a change to a piece of software” - a position that cuts against the common assumption that AI-assisted coding requires exhaustive manual review of model output.

The distinction he draws is between the act of reviewing code and the broader task of verification, which can take other forms. As coding agents handle larger and more complex tasks, the ability to confirm correctness without reading every line becomes a practical necessity rather than a shortcut. The note sits alongside recent writing on Willison’s site covering agentic engineering, a tag he has now applied to 59 posts, and topics including conceptual integrity and model behaviour in tools such as Qwen 3.8 27B.

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