Conciseness

Dense, high-signal tables, checklists, and concrete rules with no explanation of concepts Claude already knows. Minor trimmable redundancy: the "REQUIRED BACKGROUND" block appears nearly verbatim twice (Overview and Iron Law sections), and the test-first mandate is restated across the Overview, Iron Law, rationalizations table, STOP section, and checklist.

Actionability

Highly concrete and executable for an instruction skill: TDD mapping table, a numbered micro-test protocol ("5+ reps per variant", "Always include a no-guidance control"), the failure-to-form matching table, a per-phase checklist, and the script-invocation rule ("bash scripts/tool.sh"). Minor gap: no inline worked example of a pressure scenario or sample baseline subagent prompt — that is delegated to references/testing-skills-with-subagents.md.

Workflow Clarity

The RED-GREEN-REFACTOR cycle is explicitly sequenced with validation checkpoints (baseline run without the skill, verification run with the skill, re-test until bulletproof), feedback loops for error recovery, and a mandatory per-skill deployment checklist — a direct match for the anchor-5 pattern. No destructive or batch operations apply, so no cap is triggered.

Progressive Disclosure

All five SKILL.md references (anthropic-best-practices.md, discovery.md, flowcharts.md, bulletproofing.md, testing-skills-with-subagents.md) are real files, one level deep, each with an explicit when-to-read condition, and heavy material (the 1150-line best-practices file) is correctly externalized at 399 body lines. Minor gaps: two references chain to a second level (flowcharts.md → graphviz-conventions.dot; bulletproofing.md → persuasion-principles.md), and the cross-skill links to ../using-superpowers/references/ point outside the bundle and may not resolve.

Specificity

Names the skill-authoring domain and three actions ("creating new skills", "editing existing skills", "verifying skills work before deployment"), but the skill's actual methodology (TDD adaptation, subagent pressure-testing, bulletproofing) is entirely absent, so coverage gaps are more than minor.

Completeness

The "when" is explicit and multi-triggered ("Use when creating new skills, editing existing skills, or verifying skills work before deployment"), but no "what" is stated anywhere — nothing describes what the skill does. This matches the anchor-2 case of only "when" present without "what"; it is not 3 because that anchor is the mirror case (clear what, missing when).

Trigger Term Quality

"creating new skills", "editing existing skills", "verifying skills work", and "deployment" are phrases users would naturally say; however common synonyms like "writing skills", "testing a skill", "skill authoring", or "SKILL.md" are missing.

Distinctiveness Conflict Risk

Skill authoring is a clear, narrow niche with distinct triggers (creating/editing/verifying skills); these would not fire for ordinary task skills, and TDD is unmentioned so there is no overlap with TDD-related skills.