Five rules for evaluating agent skills before they bloat your context window

You’re probably hearing more about SKILL.md files, and you’ll see that a lot of people test them the same way: paste a prompt into chat, watch it pass once on a laptop, and merge to main. But when you paste three pages of CLI docs into a markdown file without an evaluation loop, you are just as likely to confuse a frontier model as you are to help it. For the past weeks, we have been diligently measuring and optimizing our own Google Cloud Developer Plugin, with the most essential skills and th…

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