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hugo-theme

Build, customize, and debug advanced Hugo CMS themes — template architecture, asset pipeline (CSS/JS/image processing), shortcodes and render hooks, page bundles, cover images, Hugo Modules, performance, SEO, and CI/CD. Use when working on a Hugo theme or site template layer.

MIT

Works with any agent framework supporting the Agent Skills format.

source	hugo-version
Research compiled from official Hugo docs, major theme repositories, Hugo power user blogs, and community discussions.	v0.154+

Hugo Theme Development

Intermediate-to-advanced patterns for Hugo CMS theme development. Load the relevant reference file for your task.

Reference Files

Topic	Hugo Min	Load when...	File
Template Architecture	v0.120+	You need to set up base templates with blocks, understand template lookup order (kind/layout/type/section), create partials, use partial decorators (v0.154+), or work with shortcode fundamentals	`references/template-architecture.md`
Asset Pipeline	v0.161+	You're integrating Tailwind CSS v4 (`css.TailwindCSS`) or v3 (PostCSS), using Hugo Pipes for SCSS/JS bundling, setting up fingerprinting and SRI, building responsive images with srcset, or processing page/global/remote resources	`references/asset-pipeline.md`
Shortcodes & Render Hooks	v0.112+	You need complex nested shortcodes, raw HTML shortcodes, markdown rendering inside shortcodes, custom render hooks for links/images/headings/code blocks, or language-specific code block rendering (Mermaid, etc.)	`references/shortcodes-and-hooks.md`
Content Organization & i18n	v0.126+	You're working with leaf vs branch bundles, headless bundles, cover images, custom taxonomies, content adapters (v0.126+, dynamic pages), section-specific layouts, archetypes, or internationalization (translation tables, multilingual)	`references/content-and-i18n.md`
Cover Images	v0.120+	You need to add cover/hero images to articles, support both page bundle resources and frontmatter paths, generate responsive srcsets, or handle the no-cover case gracefully	`references/cover-images.md`
Modules & Performance	v0.109+	You're using Hugo Modules (init, import, vendor, workspace), building theme components with mount configuration, optimizing build speed with `partialCached`, configuring cache TTLs, or using configuration-driven theming (params, cascade)	`references/modules-and-performance.md`
Design, UX & Accessibility	v0.120+	You need typography systems, accessible color palettes, design tokens, semantic HTML landmarks, ARIA patterns, keyboard navigation, accessible forms, content-first layouts, responsive navigation, engagement patterns (reading progress, dark mode toggle, sharing), Core Web Vitals optimization, container queries, `:has()` selectors, or testing/QA automation (axe-core, Lighthouse CI, visual regression)	`references/design-accessibility.md`
SEO, Output Formats & CI/CD	v0.120+	You need JSON-LD structured data, Open Graph / Twitter Cards, custom output formats (JSON, AMP), sitemap customization, or CI/CD pipelines for themes (GitHub Actions, testing, deployment)	`references/seo-outputs-testing.md`

Quick Start

{{/* Minimal theme baseof.html — start here */}}
<!DOCTYPE html>
<html lang="{{ .Site.Language.Lang }}">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>{{ block "title" . }}{{ .Site.Title }}{{ end }}</title>
  {{ block "styles" . }}{{ end }}
</head>
<body>
  {{ block "header" . }}{{ partial "header.html" . }}{{ end }}
  <main>{{ block "main" . }}{{ end }}</main>
  {{ block "footer" . }}{{ partial "footer.html" . }}{{ end }}
  {{ block "scripts" . }}{{ end }}
</body>
</html>

Step-by-Step: Bootstrap a New Theme

# 1. Create the theme directory
mkdir -p themes/my-theme/{layouts/{_default,_markup,partials,shortcodes},assets/{scss,css,js}}

# 2. Create baseof.html (use the template above) defining blocks:
#    title, styles, header, main, footer, scripts

# 3. Create partials for reusable components
#    layouts/partials/header.html, footer.html, css.html

# 4. Set up your asset pipeline
#    - SCSS  → assets/scss/main.scss + toCSS partial
#    - Tailwind  → assets/css/main.css + css.TailwindCSS partial
#    - JS  → assets/js/main.js + js.Build

# 5. Configure hugo.yaml
#    theme: my-theme
#    See the reference file for your chosen CSS approach.

# 6. Build and verify
hugo --gc
ls public/ | head

Tip: Project-level layouts/ overrides theme layouts/. If you want to test your theme in isolation, keep the project layouts/ directory empty until you need overrides.

Common Pitfalls

SCSS requires Hugo extended edition. The default macOS/Homebrew Hugo build is NOT extended. Verify with hugo version | grep extended.
Tailwind v4 uses css.TailwindCSS, not PostCSS. Don't install postcss-cli for v4 — use the native pipe directly. Tailwind v3 still needs the PostCSS pipeline.
partialCached stale with non-constant args. Variant strings (.Section, page.RelPermalink) must be unique per caller. Repeated section names produce stale results.
hugo new respects archetype directory structure. Place archetypes at archetypes/<section>/index.md to create page bundles instead of flat files.
resources.Get looks in assets/, not static/. Files in static/ are copied verbatim and not processed by Hugo Pipes. Use assets/ for any file that goes through Pipes.
Content adapter templates MUST use _content.gotmpl naming. Regular .md files in the same directory are ignored when a _content.gotmpl exists.
Render hook templates go in _markup/ subdirectories. Not in _default/ directly — they need layouts/_default/_markup/render-link.html or section-specific layouts/<type>/_markup/.
block in partials conflicts with define in page templates. {{ block "title" . }} inside a partial (e.g. head.html) uses the same Go template namespace as {{ define "title" }} in page templates (e.g. single.html). When both exist in the render tree, Hugo errors with multiple definition of template "title". Fix: use direct page variables (.Title, .Site.Title) in partials instead of block. Reserve block exclusively for the baseof.html shell.

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