Agent Skills: ring:writing-skills

Writing or editing a Ring skill: SKILL.md structure, frontmatter and Agent-Search-Optimization rules, token-efficiency targets, and bulletproofing (Iron Law, rationalization tables, Red Flags) so discipline-enforcing skills resist excuses. Use when creating or revising a skill. Delegates pressure-testing to ring:testing-skills-with-subagents. Skip for pure reference skills with no rules, or project conventions (put those in CLAUDE.md).