Conciseness

The body is dense, template-driven, and assumes Claude's competence — it never explains what a blog post or brand voice is, and every line carries actionable guidance. It falls short of a 5 mainly because the "When to use" section largely re-lists trigger keywords already in the description, and a few template lines (e.g. the placeholder ban list) could be tightened.

Actionability

The body provides a complete, fill-in-ready system prompt template with concrete defaults (600–900 words, 120–180 words, ≤270 chars), a fixed four-part output format, an explicit "Stop only when all four are true" checklist, capability-priority rules, and a full worked example. The placeholder style is justified for a template skill, and the worked example covers the common case end to end.

Workflow Clarity

Sections proceed logically (identity → prompt template → required rules → capabilities → anti-patterns → worked example), and the produced-prompt spec embeds an explicit completion checklist as a validation checkpoint. It is not a 5 because the builder-facing process itself is never laid out as an explicit ordered sequence with checkpoints — the flow must be inferred from section order plus the worked example.

Progressive Disclosure

No bundle files exist, and the single-file body is well organized under clear headers with everything appropriately inlined for a playbook of this size. It sits at 4 rather than 5 only because the document is ~100 lines — above the under-50-line simple-skill case — and the inline system-prompt template is a long block that could arguably live in a reference file.

Specificity

"Authoring playbook for building agents that draft written content — blog posts, marketing copy, social media posts, newsletters, product descriptions, landing pages, or ad copy" names the domain and enumerates seven concrete formats, giving several specific actions with only minor gaps. It is not a 5 because the core action is a single one (authoring a playbook for building writer agents) rather than a list of multiple distinct concrete operations.

Completeness

Both halves are explicit: the what is "Authoring playbook for building agents that draft written content — [format list]" and the when is "Use this when the user wants an agent that writes, drafts, or rewrites text for publication or marketing." This mirrors the 5-anchor example that clearly answers both what and when with concrete trigger phrases.

Trigger Term Quality

The when-clause includes natural user phrasings — "when the user wants an agent that writes, drafts, or rewrites text for publication or marketing" — plus format keywords (blog posts, social media, newsletters, ad copy). A few natural terms users might say are missing (e.g., "copywriter", "article", "SEO", "brand voice"), which keeps it just below the comprehensive synonym coverage of a 5.

Distinctiveness Conflict Risk

The niche (building agents that write content) is clearly distinct from a general writing or editing skill, and the triggers are scoped to wanting an agent built. Minor overlap risk remains with generic agent-builder playbooks or plain copywriting skills, so it sits at 4 rather than the minimal-conflict 5.