Conciseness

The body is mostly tight FAIL/PASS code contrasts and checklists with no padded prose, but at ~490 lines it extensively documents standard security practices Claude already knows (parameterized queries, httpOnly cookies, DOMPurify, npm audit), and the final '部署前安全檢查清單' largely duplicates the per-section '驗證步驟' checklists. Not 4 because the duplication and known-material length are noticeable; not 2 because there is no conceptual over-explanation of basics.

Actionability

Concrete, mostly executable examples throughout: zod schema validation, parameterized Supabase/$1 queries, RLS policies, DOMPurify sanitization, rate-limit configs, npm audit commands. Not 5 because some examples are not executable as written — `import { verify } from '@solana/web3.js'` is not a real export (correct API is nacl.sign.detached.verify), `@/lib/csrf` is an unexplained placeholder, and express-rate-limit middleware is mixed into Next.js-style route handlers; not 3 because the vast majority of code is copy-paste ready.

Workflow Clarity

Each topic section pairs FAIL/PASS examples with an explicit '驗證步驟' checklist, and the closing pre-deployment checklist aggregates checkpoints across all areas — validation gates are clearly present. Not 5 because no review sequence is defined and there is no fail→fix→recheck loop telling Claude what to do when a check fails; not 3 because checkpoints are explicit and per-topic, not merely implied.

Progressive Disclosure

A single ~490-line file with no references at all; domain-specific sections (區塊鏈安全/Solana, 安全測試) are inlined content that could live in separate reference files, though clear section headers keep navigation reasonable. Not 4 because nothing is split out despite the length; not 2 because the file is well-structured with headers, not a wall of text.

Specificity

"Provides comprehensive security checklist and patterns" names the domain but is generic about what the skill actually does; the enumerated items ("adding authentication, handling user input, working with secrets") are trigger conditions rather than concrete actions. It is not 4 because no specific capabilities (e.g., SQL injection, XSS, CSRF, secret-leak checks) are stated in the 'what', and not 2 because the domain plus trigger list give it more substance than a minimal one-liner.

Completeness

Both parts are explicitly present: an explicit when clause ("Use this skill when adding authentication... or implementing payment/sensitive features") and a what ("Provides comprehensive security checklist and patterns"). Not 5 because the 'what' is vague — 'comprehensive' and 'patterns' do not state what the checklist covers; not 3 because the when clause is explicit and multi-trigger, not weakly implied.

Trigger Term Quality

Good natural keywords users would say: "authentication", "user input", "secrets", "API endpoints", "payment", "sensitive features". Not 5 because common synonyms and specifics are missing: "auth", "login", "vulnerabilities", "security audit", "XSS", "SQL injection"; not 3 because coverage goes well beyond a single keyword.

Distinctiveness Conflict Risk

Clear security niche with distinct triggers (secrets, payments, API endpoints) that mostly avoids conflicting with general code or document skills. Not 5 because of moderate overlap risk with generic code-review or security-audit skills; not 3 because the trigger set is security-specific, not merely 'somewhat specific'.