Conciseness

The body is mostly tight bullet-style guidance, but step 2 spends ~15 lines on version-sensitive detail ("WordPress 6.9 enforces apiVersion: 3", "WordPress 7.0 will run the post editor in an iframe", style isolation/viewport rationale) that substantially duplicates references/block-json.md, which repeats the same apiVersion requirements, rationale, and migration checklist. This is more than minor trimming and the version-numbered content is not confined to a deprecated/old-patterns section, so it does not reach anchor 4.

Actionability

Guidance names concrete commands (`node skills/wp-block-development/scripts/list_blocks.mjs`) and exact APIs (`useBlockProps()`, `useBlockProps.save()`, `get_block_wrapper_attributes()`, `useInnerBlocksProps()`), with specific pitfalls ("changing `name` breaks compatibility", "avoid the deprecated `meta` attribute source"). It is not a 5 because several steps defer entirely to reference files without a single inline executable snippet (e.g., no example `deprecated` entry or registration call), leaving minor gaps.

Workflow Clarity

A clearly sequenced procedure (triage → scaffold → model choice → metadata → registration → patterns → serialization → deprecations → tooling) with a dedicated Verification checklist ("Saving + reloading does not create 'Invalid block'") and a Failure modes section that routes errors to specific references. It falls short of anchor 5 because intermediate checkpoints are sparse (only step 1 has an explicit confirm step) and the verification items lack the concrete commands a full feedback loop would use.

Progressive Disclosure

The body is a lean overview with well-signaled, one-level-deep 'Read: references/*.md' pointers, and all 10 referenced reference files exist in the bundle with real content. However, scoring against the actual bundle: the referenced path `skills/wp-block-development/scripts/list_blocks.mjs` resolves only to `scripts/list_blocks.mjs` in the bundle layout, and `skills/wp-project-triage/scripts/detect_wp_project.mjs` does not exist in this bundle at all — minor navigation gaps that keep it below the anchor-5 'easy navigation' bar.

Specificity

The description enumerates concrete, technical coverage areas — "block.json metadata, register_block_type(_from_metadata), attributes/serialization, supports, dynamic rendering (render.php/render_callback), deprecations/migrations, viewScript vs viewScriptModule" — which comprehensively covers the block-development domain with specific APIs and file names rather than vague language. It is not a 4 because the coverage goes beyond 'several specific actions with minor gaps' into a full inventory of the domain's concrete surfaces.

Completeness

It explicitly answers 'when' with a leading "Use when developing WordPress (Gutenberg) blocks" trigger clause, and answers 'what' with a concrete enumeration of the skill's scope. Both are explicit and concrete, matching the anchor-5 pattern of stating capabilities plus an explicit 'Use when...' with trigger phrases.

Trigger Term Quality

Strong natural terms are present ("WordPress (Gutenberg) blocks", "block.json", "render.php", "@wordpress/scripts", "create-block"), but common user phrasings like "create a block", "block editor", or failure-language such as "block invalid" / "attributes not saving" are missing. It sits above anchor 3 (which would miss most variations) but lacks the synonym-level breadth of anchor 5.

Distinctiveness Conflict Risk

"WordPress (Gutenberg) blocks" with APIs like `register_block_type`, `render_callback`, and `viewScriptModule` carves out a clear niche that would not plausibly fire for PDF, git, or generic web skills. Trigger terms are distinct with minimal overlap risk.