Conciseness

The body is mostly lean, domain-specific guidance ('Email 2 (day 1 or 2): First-value step. Help them get to a quick win') but includes a few email basics Claude already knows, such as 'Short paragraphs (2 to 3 lines)' and 'Mobile-first formatting', that could be trimmed. It sits at anchor 4 rather than 5 because a handful of tokens do not earn their place, and above anchor 3 because there is no padded conceptual explaining.

Actionability

Guidance is concrete and executable throughout: per-email timing ('Email 4 (day 8)'), character budgets ('Length: 30 to 50 characters'), word counts ('Welcome and transactional: under 100 words'), example subject lines ('Your week 1 progress: 3 of 5 steps done'), and a copy-paste output template ('# Sequence: [Name] ... **Subject:** [text]'). Specific examples cover the common cases, matching the anchor-5 pattern rather than anchor 4's 'minor gaps'.

Workflow Clarity

Two clearly numbered workflows ('1. Define the trigger ... 9. Measure. Open rate, click rate, completion rate') with explicit test steps ('Test the sequence. Send to yourself. Read on mobile.'). It is not anchor 5 because there are no error-recovery feedback loops, e.g. no guidance on what to change when open rate or completion rate is low.

Progressive Disclosure

Good structure: framework and components stay inline while details live in two real, well-signaled, one-level-deep reference files. The body promises 'Skeleton templates for the 6 sequence types' but sequence-templates.md actually covers 'the 5 standard sequence types' — a small navigation/accuracy mismatch that keeps it below the anchor-5 'easy navigation' bar.

Specificity

'Design and write email campaigns and sequences including onboarding flows, lifecycle campaigns, transactional emails, newsletters, broadcast sends, and launch and announcement emails' plus 'write email copy, plan an email sequence, design an onboarding drip, set up lifecycle email campaigns' lists multiple concrete actions with comprehensive coverage of the domain. Anchor 5 fits; anchor 4 would require coverage gaps, and none are present.

Completeness

Explicit what ('Design and write email campaigns and sequences including...') and explicit when ('Use this skill whenever the user wants to write email copy, plan an email sequence, design an onboarding drip') with concrete trigger phrases — the anchor-5 example pattern exactly. Not anchor 4, because the 'when' clause is fully explicit rather than merely present or under-specified.

Trigger Term Quality

'Triggers on email sequence, drip campaign, onboarding email, lifecycle email, welcome email, transactional email, newsletter, email broadcast, launch email, announcement email, nurture sequence, abandoned cart, re-engagement, win-back' — fourteen natural trigger terms with synonyms (drip campaign/nurture sequence, win-back/re-engagement) and no file extensions relevant to this domain. Comprehensive coverage matches anchor 5, not anchor 4's 'a few natural terms missing'.

Distinctiveness Conflict Risk

A clear email-channel niche with distinct, email-scoped triggers ('onboarding email', 'email broadcast', 'abandoned cart', 'transactional email') that adjacent copywriting or content skills would not claim. Minimal conflict risk matches anchor 5; anchor 4 would require overlap with closely related skills, which the email-specific scoping avoids.