global-skills/skills/deepen/SKILL.md

name, description, scope

name	description	scope
deepen	Simplify module interfaces while preserving behavior when asked to deepen modules, improve their design, or hide leaked implementation decisions.	global

Deepen a module

1. Inspect the target module, callers, and existing behavior checks. Identify the concrete complexity exposed to callers with file/line evidence.
2. Choose the smallest interface improvement that hides a real decision. Keep existing behavior and contracts unless the user authorized changing them.
3. Refactor the selected boundary without unrelated cleanup or speculative layers. Update an existing spec only if its contract is affected; do not require a spec.
4. Verify affected behavior under shared verification. Distinguish pre-existing failures from regressions rather than requiring the entire repository to be green before starting.
5. Show the interface change, complexity hidden, and verification result.

Do not activate merely because token budget remains. Improve the requested scope; keep dependent changes coherent rather than imposing an arbitrary one-module limit.