Conciseness

The body is dense routing policy — every section maps tasks to specific files or URLs and explains nothing Claude already knows (no "what Stripe is", no library tutorials). It sits at anchor 4 rather than 5 because the read-before-acting instruction is repeated across the intro ("A link or filename in this skill isn't a substitute for reading its contents"), the numbered loading procedure, and the final bullets, and a few long parenthetical sentences could be trimmed.

Actionability

Task tables give exact file paths (<references/ui-extensions.md>, <references/script-extensions.md>) and canonical URLs, and the 3-step loading procedure plus rules like resolving "references/ paths relative to this skill's directory" are directly executable. It is not anchor 5 because a few rows stay high-level ("Follow the selected interface's product documentation from the extension-point catalog" names no location for the catalog, and "each selected component's current API documentation" defers the lookup without a pointer).

Workflow Clarity

A clear sequence is present: clarify requirements (discovery.md, extension-types.md) → select capability via product-capability tables → load the applicable references (numbered 1-2-3) → read canonical docs → implement and report. Checkpoints include the version-conflict recovery rule ("If an example in a reference disagrees, check the version and follow the applicable canonical documentation") and "state what is unknown or unsupported before proceeding". It is not anchor 5 because build/test/debug validation steps are largely deferred to the reference files rather than stated as explicit checkpoints in SKILL.md itself.

Progressive Disclosure

SKILL.md is a pure routing overview pointing to 12 substantive reference files, one level deep, each clearly signaled by task in the tables, and all referenced paths verified to exist on disk. Cross-references between bundle files are minimal and surfaced (backend→webhooks, workflow→feedback), combining rows for multi-type apps is explicitly supported, and the body instructs loading only task-relevant files. This matches anchor 5: clear overview, well-signaled one-level-deep references, easy navigation.

Specificity

The description lists several concrete actions ("Build, modify, or review Stripe Apps and extensions", "deciding whether a Stripe extension can support the user's billing or workflow requirements") and comprehensively enumerates the artifact types involved. It falls short of anchor 5 because the verbs are generic (build/modify/review/decide could apply to any domain) and the specificity comes mostly from the object list, while the phrase "using the relevant documentation and reference guides" is filler; it is clearly above anchor 3, which expects only 1-2 concrete actions with incomplete coverage.

Completeness

It explicitly answers both questions: the what ("Build, modify, or review Stripe Apps and extensions") and the when via concrete trigger clauses ("Use for custom Stripe Dashboard UI, stripe-app.yaml, @stripe/ui-extension-sdk..." and "Also use when deciding whether a Stripe extension can support the user's billing or workflow requirements"). This matches anchor 5's requirement of explicit what and when with concrete trigger phrases; anchor 4 would require a weaker or less specific when-clause.

Trigger Term Quality

Good natural keyword coverage including "Stripe Apps", "custom Stripe Dashboard UI", "stripe-app.yaml", "@stripe/ui-extension-sdk", "script extensions", "custom workflow actions", and "apps that authenticate to Stripe or react to events" — terms a developer of a Stripe App would plausibly say. A few natural synonyms are missing (e.g., "webhooks" instead of only "react to events", "marketplace app", "app scaffold"), which keeps it at anchor 4 rather than 5; it is well above anchor 3's partial coverage.

Distinctiveness Conflict Risk

The Stripe Apps niche is clear and anchored by distinctive triggers (stripe-app.yaml, @stripe/ui-extension-sdk, extension interfaces, Dashboard UI), so it is mostly distinct as anchor 4 describes. It is not anchor 5 because phrases like "apps that authenticate to Stripe or react to events" and "the user's billing or workflow requirements" bleed mildly into general Stripe/payments-API integration territory where a sibling Stripe skill could compete.