Conciseness

The spec table ('2400×1200 physical (1200×600 logical)', 'X clips edges on mobile', 'X crawlers timeout after ~5 seconds') packs non-obvious domain knowledge densely with no tutorial filler, and nothing explains concepts Claude already knows. Minor trimmable padding exists — the promotional footer ('Built for BondTerminal...') and 'Pre-generation ensures instant response for crawlers' restating the earlier Risk note — which keeps it just below anchor 5's 'every token earns its place'.

Actionability

The meta-tags block and the @vercel/og route are concrete and nearly copy-paste ready. Minor gaps hold it at anchor 4: the Express example embeds '/* ... */' pseudocode inside new ImageResponse(...), and the pre-generated route calls 'await db.get()' inside a non-async callback, which would not run as written. Not 3, since the code is real and executable in the main paths rather than pseudocode-dominant.

Workflow Clarity

The body flows logically from specs to the title-overlay fix, meta tags, generation, and serving strategy, and the Checklist ends with an explicit validation checkpoint ('Test: https://cards-dev.twitter.com/validator'). Not 5 because steps are not explicitly ordered and there is no error-recovery loop (e.g., what to do when the validator shows a blank preview); not 3 because a concrete verification step is present rather than missing or implicit.

Progressive Disclosure

The single file is well-organized into clear sections with nothing buried, and no bundle files exist to reference. It exceeds the under-50-lines simple-skill exception for a reference-free 5, and advanced variants (Express serving, dynamic-route strategies) are inlined that could live in reference files — matching anchor 4's 'good structure; minor organization gaps' rather than anchor 5's well-signaled one-level-deep references.

Specificity

Names the domain ('X/Twitter cards') and one concrete action ('Create') with a style constraint ('look like images, not marketing banners'), but does not enumerate multiple capabilities such as meta tag setup, dynamic image generation, or hiding X's title overlay. Fits the anchor for 1-2 concrete actions that are not comprehensive — not 4, which requires several specific actions listed.

Completeness

Explicitly answers both 'what' ('Create X/Twitter cards that look like images, not marketing banners') and 'when' ('Use when asked to...') with concrete quoted trigger phrases. Matches the anchor-5 example pattern of a clear what paired with an explicit, maximally specific when clause — the when here is not one that 'could be more explicit', ruling out 4.

Trigger Term Quality

Includes four natural, quoted phrases users would actually say ('create OG images', 'set up X cards', 'make social cards', 'twitter card without text'). Falls short of anchor 5 because common variants like 'open graph image', 'OG tags', 'link preview', or 'share preview' are missing, but coverage is well beyond anchor 3's 'some relevant keywords'.

Distinctiveness Conflict Risk

The X-card appearance niche is distinct, but the trigger 'create OG images' (and to a lesser degree 'make social cards') would plausibly fire a generic Open Graph image-generation skill, creating minor overlap risk with a closely related skill. Not 5 ('minimal conflict risk') because of that overlap; not 3 because the skill's framing is clearly its own niche rather than broadly overlapping.