Move PR and migration workflows out of CLAUDE.md into skills

The problem

Detailed PR-review or migration steps in CLAUDE.md cost tokens even when you are fixing a one-line typo.

The hack

Extract workflow playbooks into `.claude/skills/*/SKILL.md` (or `.claude/commands/`) and keep CLAUDE.md essentials-only.

Why it works

Skills load on demand. CLAUDE.md loads every session. Official cost guidance recommends this split to shrink base context.

Setup

1. Identify CLAUDE.md sections that only matter for specific workflows. 2. Create `.claude/skills/pr-review/SKILL.md` (or similar) with those steps. 3. Delete the duplicated block from CLAUDE.md. 4. Invoke with `/pr-review` when needed and confirm `/usage` shows lower baseline cost.

Additional details

Source