write-spec

Break large features into independently verifiable, human-reviewable slices under a feature directory in specs/. Use for risky or multi-step feature work that needs upfront questioning, API seams, browser-playable checkpoints, HTML visualizations, screenshot gates, staged implementation plans, recursive fog-of-war reslicing, or proactive research into reference implementations/best practices before slicing. Pairs with [write-scene](../write-scene/SKILL.md) and [screenshot-regression](../screenshot-regression/SKILL.md) (the browser checkpoints and screenshot gates), [refactor-clean](../refactor-clean/SKILL.md) (review the materialized spec so the plan describes one-owner architecture, not the feature bolted on), and [review](../review/SKILL.md) (audit each slice before it lands).