Conciseness

The body is dense and assumes competence — no time is spent explaining React, JSX, or what a monorepo is ('Single package.json -- no monorepo, no workspaces needed' states facts rather than teaching). Minor trim opportunities exist, e.g., the closing rationale 'This keeps extensions self-contained...' and some rows of the full config example repeat what the tables already teach.

Actionability

Guidance is fully executable: a complete copy-paste-ready webiny.config.tsx, a table mapping each JSX element to file type, the exact command 'yarn webiny extension <extension-name>', and two MUST rules that state the exact failure mode ('Omitting the file extension will cause a build failure').

Workflow Clarity

This is a reference skill, and the implicit register-an-extension workflow (create file under extensions/ with export default, register with full .ts/.tsx path in webiny.config.tsx) is derivable but never laid out as an explicit ordered sequence. No destructive or batch operations exist, so no validation cap applies; an explicit 3-step 'adding a new extension' sequence would close the gap.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent), and the single file is well-sectioned with a TL;DR, tables, and a Related Skills section acting as one-level-deep navigation. It is not a 5 because the build-parameters and infrastructure-components sections are self-contained detail that could live in a reference file for a skill this length.

Specificity

Names the domain and several concrete capabilities: 'Webiny project layout, webiny.config.tsx anatomy, and extension registration'. Not a 5 because coverage stops at three items — build parameters, pre-built extension installs, and infrastructure configuration from the body are absent.

Completeness

Explicitly answers both: what ('Webiny project layout, webiny.config.tsx anatomy, and extension registration') and when ('Use this skill when the developer asks about folder structure... Also use when they need to understand the relationship between extensions/, webiny.config.tsx, and the different extension types'). Concrete trigger phrases match the anchor-5 example pattern.

Trigger Term Quality

Natural user phrasing is well covered: 'folder structure', 'where custom code goes', 'how to register extensions', 'what webiny.config.tsx does', 'how the project is organized'. Falls short of a 5 because it lacks synonym variations and file-extension triggers (e.g., 'project organization', 'config file', '.tsx').

Distinctiveness Conflict Risk

The 'Webiny' framing plus specific artifacts (webiny.config.tsx, extensions/, Api/Admin/Infra/CLI extension types) form a clear niche with distinct triggers. It is an understanding/reference skill (structure and registration anatomy) rather than deployment or DI, so overlap with sibling Webiny skills is minimal.