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special-chars

Use when applies to any site with user-generated slugs, CMS-generated URLs, or content in non-English languages. Use when auditing URLs for crawl errors or canonicalization issues.

52

Quality

57%

Does it follow best practices?

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SecuritybySnyk

Passed

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tessl review fix ./skills/special-chars/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

78%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The body is a well-structured, efficient audit skill: concrete check criteria, a sensible Check/Fix/Explain/Code Review flow, and exemplary progressive disclosure with a single well-signaled reference file. The only refinements are trimming the Explain section's re-teaching of RFC 3986 and adding a post-fix verification step.

DimensionReasoningScore

Conciseness

The body is lean and dense — 'Scan all crawled URL paths for characters outside `[A-Za-z0-9\-_./~]`' delivers exact guidance in one line. The 'Explain' section directs Claude to re-explain RFC 3986 reserved/unreserved basics it already knows, and the trailing rule-page URL duplicates frontmatter metadata, so a few tokens could be trimmed.

4 / 5

Actionability

Concrete, executable guidance throughout: an exact character class to scan against, specific flag conditions ('spaces (`%20` or literal)', 'separate 200 responses'), and a specific fix path ('Replace spaces with hyphens... Set up redirects'). Not fully copy-paste ready — no inline crawl/export command and the slugify example lives only in the reference file.

4 / 5

Workflow Clarity

A clear Check → Fix → Explain → Code Review sequence with headers, and an explicit verification checkpoint ('Check if different encodings of the same URL return separate 200 responses'). Minor gap: no post-fix validation step such as verifying the new redirects resolve.

4 / 5

Progressive Disclosure

A short, well-sectioned overview with a clearly signaled one-level-deep reference — 'For full implementation details, code examples, and framework-specific guidance, see `references/rule.md`' — and that file exists and carries the bulk detail (tables, examples, slugify code) without nesting further. Matches the ideal overview-plus-reference structure.

5 / 5

Total

17

/

20

Passed

Description

36%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is trigger-focused to a fault: it gives two 'when' clauses but never says what the skill does, omits the topic's central vocabulary (special characters, encoding), and opens with a garbled 'Use when applies to' construction. It would benefit from a what-first clause naming the concrete capability.

Suggestions

Lead with a 'what' clause before the triggers, e.g. 'Checks URL paths for special/reserved characters and guides fixes for clean slugs.'

Include the core natural trigger terms users would say: 'special characters', 'URL encoding', 'percent-encoding', not just slugs and canonicalization.

Fix the garbled opening sentence 'Use when applies to any site...' — merge it into a single well-formed 'Use when...' clause covering site types and audit contexts.

DimensionReasoningScore

Specificity

The description names the domain ('user-generated slugs, CMS-generated URLs', 'crawl errors or canonicalization issues') but lists no concrete actions — it never states what the skill actually does. It is more specific than the vague 'Helps with documents' anchor (not 1) but lacks the 1-2 concrete actions needed for anchor 3.

2 / 5

Completeness

Both sentences are 'Use when...' clauses, so only 'when' is present with no 'what' — the exact anchor-2 pattern ('Use when working with documents'). The opening phrase 'Use when applies to any site' is also garbled, further weakening the statement.

2 / 5

Trigger Term Quality

Relevant keywords like 'slugs', 'crawl errors', and 'canonicalization' are present, but the core natural terms for this topic — 'special characters', 'URL encoding', 'percent-encoding' — are entirely absent. This matches 'some relevant keywords but missing common variations or synonyms' rather than anchor 4's good coverage.

3 / 5

Distinctiveness Conflict Risk

'User-generated slugs' and 'non-English languages' are reasonably niche triggers, but 'auditing URLs for crawl errors or canonicalization issues' would also naturally fire sibling SEO URL-hygiene skills (URL length, slug format). Somewhat specific but overlap with closely related skills remains.

3 / 5

Total

10

/

20

Passed

Validation

93%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 15 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

metadata_version

'metadata.version' is missing

Warning

Total

15

/

16

Passed

Repository
thedaviddias/Front-End-Checklist
Reviewed

Table of Contents

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