This is the checklist you run before pushing to production and the playbook for not panicking when things go sideways. It covers the pre-launch essentials (security, performance, accessibility), then walks through staged rollouts with feature flags and specific thresholds for when to advance or roll back. The rollout decision table is especially practical: it gives you actual numbers for error rates and latency increases that mean "keep going" versus "revert now". Every deployment should answer two questions before it happens: what does success look like, and how do we undo this if it breaks? This skill makes sure you have answers to both.
npx skills add https://github.com/addyosmani/agent-skills --skill shipping-and-launch