How to prompt and scaffold Claude Opus 4.8 — effort/thinking defaults, verbosity, literal instruction-following, tool-use and subagent triggering, code-review recall, and the cream/serif frontend house-style that's wrong for dashboards. Use when starting Opus 4.8 work, migrating prompts from Opus 4.7, tuning verbosity or effort, wondering why the model isn't "thinking", seeing a code-review recall drop, or getting a cream+serif design you didn't ask for.
