Conciseness

The body is lean and assumes Claude's competence (no explanation of what X or meta tags are), with minor redundancy: image specs (1200×630 px, 5 MB) appear in both Quick Reference and Fix, and the Code Review section reads as boilerplate. Anchor 4 (efficient, minor instances that could be trimmed) rather than 5 (every token earns its place).

Actionability

Guidance is concrete and executable: exact tag syntax ('<meta name="twitter:card" content="summary_large_image">'), valid card types, minimum image dimensions (300×157 px), file-size limits, absolute-URL requirement, and a concrete verification step ('Test the URL in the X Card Validator'). It falls short of anchor 5 only because the full copy-paste HTML block lives in the reference file rather than the body.

Workflow Clarity

The Check → Fix → Explain → Code Review structure gives a clear sequence, and the Check section embeds validation ('Verify the card type is valid', 'Test the URL in the X Card Validator'). Anchor 4 rather than 5 because there is no explicit feedback loop (fix → re-validate) after the Fix step; no destructive/batch cap applies.

Progressive Disclosure

The body is a concise, well-sectioned overview that points to a real, one-level-deep reference ('For full implementation details, code examples, and framework-specific guidance, see references/rule.md' — the file exists, 93 lines, and does contain the code examples and details promised). Clear navigation with content appropriately split — matches anchor 5.

Specificity

The description names the domain (pages shared on X) and two concrete actions ('auditing social sharing previews', 'adding social meta tags to a new site'), but coverage is not comprehensive — it never mentions Twitter Card tags or card types. This matches anchor 3 (1-2 concrete actions, not comprehensive) rather than 4 (several specific actions) or 2 (minimal/generic actions).

Completeness

Both 'what' ('auditing social sharing previews or adding social meta tags') and 'when' (two explicit 'Use when...' clauses) are present, but the 'what' is imprecise — it never states the skill adds/validates twitter:card meta tags. Matches anchor 4 (both present, 'when'/'what' could be more specific), not 5.

Trigger Term Quality

Relevant keywords are present ('shared on X (Twitter)', 'social sharing previews', 'social meta tags') but common variations users would naturally say are missing — notably 'Twitter Cards' itself, plus 'tweet preview' and 'Open Graph'. Anchor 3 (some relevant keywords, missing common variations) fits better than 4.

Distinctiveness Conflict Risk

Clearly scoped to X/Twitter social sharing previews, making it mostly distinct with only minor overlap risk against generic SEO or Open Graph meta-tag skills. Anchor 4 rather than 5 since the phrase 'social meta tags' is broad enough to brush adjacent skills.