When files are accidentally created in the wrong directory, remove them immediately before proceeding to the correct location.
Before adding new UI elements to an existing site, read the stylesheet to extract design tokens (colors, radii, font, button classes) so new elements look native.
Before implementing new features, run existing tests to confirm green baseline: this ensures any failures after changes are attributable to new code, not pre-existing issues.
Review skills that the skill-extractor mined from your Claude Code traces — inspect each candidate's definition and confidence/utility scores, edit it, then install it as a real skill or reject it with a comment. Use when the user runs /review-skills, asks to "review discovered/mined skills", or a session-start banner reports pending skills.