Conciseness

The body is mostly efficient — tightly written 'What to Remove'/'What to Add' lists and good/bad example pairs that assume Claude's competence without over-explaining; not a 5 because the good/bad example pairs for each platform repeat the same lesson (remove hype, add technical specifics) across Twitter, LinkedIn, and Reddit, which is somewhat redundant and could be tightened.

Actionability

Provides fully concrete, copy-paste-ready example posts for each platform plus explicit, specific do/don't lists ('All hashtags except when platform culture expects them', 'One unique feature detail (with your model of choice)', 'Not affiliated, it just...'), covering the common cases with concrete prose rather than abstract direction.

Workflow Clarity

The drafting workflow is implicit but clear: pick platform, apply its brevity rule, remove the listed anti-patterns, add the listed specifics, then match the example — a clear sequence with most checkpoints present; not a 5 because there are no explicit validation/review checkpoints (e.g., 're-read and confirm no marketing phrases remain'), and the skill is instruction-only rather than a multi-step process.

Progressive Disclosure

Content is well-organized with clear section headers (Platform-Specific Brevity, What to Remove, What to Add, per-platform Examples) and a one-level reference pointer to [writing-voice]; good structure with minor organization gaps; not a 5 because the platform examples are long and inlined rather than split into separate files, though at ~200 lines this is a reasonable single-file choice.

Specificity

Names the domain ('Social media post guidelines for LinkedIn, Reddit, Twitter/X') and several concrete actions ('post on LinkedIn', 'write a tweet', 'draft a Reddit post', 'share this', 'drafting announcements'), giving multiple specific trigger actions with only minor coverage gaps; not a 5 because the 'what' is framed as guidelines rather than a fuller enumeration of distinct capabilities.

Completeness

Explicitly answers both 'what' (Social media post guidelines for LinkedIn, Reddit, Twitter/X) and 'when' (an explicit 'Use when:' clause with concrete trigger phrases), satisfying the top anchor for clearly and explicitly answering both what AND when with concrete trigger phrases.

Trigger Term Quality

Comprehensive coverage of natural user phrases including synonyms and platform variants ('post on LinkedIn', 'write a tweet', 'draft a Reddit post', 'share this', 'drafting announcements') — these are exactly what a user would say when needing this skill, matching the top anchor for natural-term coverage including synonyms.

Distinctiveness Conflict Risk

The skill targets a clear niche (social media drafting across three named platforms) with distinct triggers unlikely to fire for unrelated skills; not a 5 because 'share this' and 'drafting announcements' are somewhat broad and could overlap with general writing or announcement skills.