GitHub built an alt-text quality plugin because passing the automated accessibility check means nothing
GitHub Blog·low signal
GitHub's engineering blog published a piece on 2026-08-24 describing a plugin for the GitHub Accessibility Scanner that judges whether alt text is actually useful rather than merely present. The premise is that existing automated checks verify an alt attribute exists and stop there, which lets meaningless text pass. This is worth noting for anyone shipping LLM-generated alt text, which reliably clears presence checks and reliably fails usefulness ones.