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eleventy-nunjucks

Build, debug, and review Eleventy v3 sites and Nunjucks templates. Use when `package.json` includes `@11ty/eleventy` or `@awesome.me/buildawesome`; when paths include `.eleventy.js`, `eleventy.config.*`, `.njk`, `.11tydata.js`, or `.11ty.js`; when asked to "create an 11ty page", "add a Nunjucks filter", "fix my layout chain", "review my .njk template", "set up Eleventy", or "migrate to Build Awesome" (v4 prerelease); or when debugging Eleventy data cascades, shortcodes, autoescape, or `| safe` output. Standalone Nunjucks work is in scope; generic static-site, SSG, or CSP tasks need confirmed Eleventy or Nunjucks context.

Quality

89%

Does it follow best practices?

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SecuritybySnyk

Passed

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SKILL.md
Quality
Evals
Security

Quality

Content

77%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.

A well-engineered overview: strong operational procedure with an explicit completion gate, excellent progressive disclosure via a 'Load when' reference table, and concrete rules throughout. The main cost is version/date-sensitive prose woven through multiple sections rather than isolated, which hurts token efficiency.

Suggestions

Consolidate the dated version-boundary facts (3.1.7, alpha.10, recheck dates) into a single short 'Version status' or 'Old patterns' section instead of repeating them in the blockquote, the mental-model table, and the operating procedure, trimming the version prose to one place.

Inline one or two tiny executable snippets the body currently only names — e.g. a minimal `jsonScript` usage or a one-line `normalize_path` example — so the most common safe-output patterns don't force a reference load.

Tighten the 'Behavioral evaluations' section to two sentences (what it is, when to load it) by moving the grading-methodology caveats into the scenarios.json file itself.

DimensionReasoningScore

Conciseness

The body is mostly lean — terse tables, a dense data-cascade priority list, and no padding or re-explained basics — but pervasive time-sensitive version/date material (the version-boundary blockquote citing 3.1.7/Oct 2026, version rows in the mental-model table, repeated drift reminders) is not isolated in a deprecated/old-patterns section and inflates the token budget, which the guidelines direct be penalized. It is more than minor, so anchor 3 rather than 4.

3 / 5

Actionability

Concrete guidance dominates: the config search order, the exact data-cascade priority list, an autoescape behavior table, named filters (`jsonScript`, `jsonCompact`, `normalize_path`), and a copy-paste layout-chain example. It stays at anchor 4 rather than 5 because most executable detail (filter implementations, config skeletons, CSP header syntax) is delegated to reference files, leaving minor gaps in the body itself.

4 / 5

Workflow Clarity

The numbered operating procedure (read package.json/lockfile/config → choose track → open task-specific reference) is followed by an explicit five-item completion gate (build/smoke test passes, `| safe` reviewed against trust boundary, rendered output inspected) plus a version-drift stop condition — a clear sequence with explicit validation checkpoints and a checklist, matching anchor 5.

5 / 5

Progressive Disclosure

The reference table gives a 'Load when' column for all eleven one-level-deep references (all verified to exist on disk), the operating procedure instructs loading only the task-specific reference, and the authors-only eval catalog is clearly flagged — well-signaled navigation matching anchor 5.

5 / 5

Total

17

/

20

Passed

Description

100%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 exemplary: concrete third-person actions, an explicit 'Use when' clause with natural user phrases, file extensions, and package identifiers, and an explicit out-of-scope boundary that lowers conflict risk. No verbosity or over-claims; every clause is load-bearing.

DimensionReasoningScore

Specificity

"Build, debug, and review Eleventy v3 sites and Nunjucks templates" lists multiple concrete actions scoped to a named domain, with sub-capabilities (data cascades, shortcodes, autoescape, `| safe` output) rounding out coverage — comprehensive rather than the 'minor gaps' of anchor 4.

5 / 5

Completeness

Explicitly answers 'what' (build, debug, review Eleventy v3 sites and Nunjucks templates) and 'when' via a concrete "Use when…" clause enumerating package, path, phrase, and debugging triggers, plus scope boundaries — the anchor-5 pattern, clearly above anchor 4's 'when could be more explicit'.

5 / 5

Trigger Term Quality

Covers natural user phrasings ("create an 11ty page", "add a Nunjucks filter", "fix my layout chain", "set up Eleventy", "migrate to Build Awesome"), file extensions (`.njk`, `.eleventy.js`, `.11tydata.js`, `.11ty.js`), and package names (`@11ty/eleventy`, `@awesome.me/buildawesome`) — matching the anchor-5 example's synonym-plus-extension coverage.

5 / 5

Distinctiveness Conflict Risk

The Eleventy/Nunjucks niche is distinct and the closing boundary ("generic static-site, SSG, or CSP tasks need confirmed Eleventy or Nunjucks context") actively suppresses false triggers, giving minimal conflict risk per anchor 5.

5 / 5

Total

20

/

20

Passed

Validation

87%

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

Validation — 14 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

relative_links

Relative link issues: 1 deeper-than-1-level

Warning

referenced_paths_exist

Referenced path issues: 1 deeper-than-1-level

Warning

Total

14

/

16

Passed

Repository

t4sh/skills4sh

Path

skills/eleventy-nunjucks/SKILL.md

Reviewed

Table of Contents

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