# Craft Content Modeling

> Craft CMS 5 content modeling — sections, entry types, fields, Matrix, relations, project config, and content architecture strategy. Covers everything editors and developers need to structure content in Craft: choosing section types, designing entry types and field layouts, selecting field types for specific needs, configuring Matrix and nested entries, setting up relations and eager loading, and…

- **Type:** Skill
- **Install:** `agentstack add skill-michtio-craftcms-claude-skills-craft-content-modeling`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [michtio](https://agentstack.voostack.com/s/michtio)
- **Installs:** 0
- **Category:** [Content & Media](https://agentstack.voostack.com/c/content-and-media)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [michtio](https://github.com/michtio)
- **Source:** https://github.com/michtio/craftcms-claude-skills/tree/main/skills/craft-content-modeling

## Install

```sh
agentstack add skill-michtio-craftcms-claude-skills-craft-content-modeling
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Craft CMS 5 — Content Modeling

How to structure content in Craft CMS 5. Sections, entry types, fields, Matrix,
relations, asset management, and strategic patterns for real projects.

This skill covers **content architecture** — what goes in the CP, how it's
organized, and how templates access it. For extending Craft with PHP
(plugins, modules, custom element types), see the `craftcms` skill.

## Companion Skills — Always Load Together

When this skill triggers, also load:

- **`craft-site`** — Template architecture, component patterns, routing. Required when content decisions affect how templates render data.
- **`craft-twig-guidelines`** — Twig coding standards. Required when writing any Twig examples or template code alongside content modeling.
- **`ddev`** — All commands run through DDEV. Required for running project config commands, Craft CLI, and content migrations.

## Documentation

- Entries: https://craftcms.com/docs/5.x/reference/element-types/entries.html
- Sections: https://craftcms.com/docs/5.x/reference/element-types/entries.html#sections
- Fields: https://craftcms.com/docs/5.x/system/fields.html
- Field types: https://craftcms.com/docs/5.x/reference/field-types/
- Matrix: https://craftcms.com/docs/5.x/reference/field-types/matrix.html
- Relations: https://craftcms.com/docs/5.x/system/relations.html
- Eager loading: https://craftcms.com/docs/5.x/development/eager-loading.html
- Project config: https://craftcms.com/docs/5.x/system/project-config.html

Use `WebFetch` on specific doc pages when a reference file doesn't cover enough detail.

## The Craft 5 Mental Model

**Everything is becoming an entry.** Entry types are global (shared across sections and
Matrix fields). Fields come from a global pool. This is the "entrification" of Craft — categories, tags, and globals are being unified into entries over a three-version arc:

- **Craft 4.4** — `entrify` CLI commands added to convert categories, tags, and globals to entries
- **Craft 5** — Categories, tags, and global sets are deprecated and discouraged for new projects. New category groups, tag groups, and global sets can still be created in the CP (the "New" buttons remain, gated by `allowAdminChanges`), and existing ones continue to work. A unified "Content" section replaces the fragmented entries view. Custom entry index pages (5.9.0) solve the sidebar organization concern.
- **Craft 6** — Categories, tags, and global sets will be removed entirely

For **new projects**, always use entries: Structure sections for hierarchical taxonomy, Channel sections for flat taxonomy, Singles for site-wide settings. For **existing projects**, migrate at your own pace using the `entrify` commands.

Three decisions define your content architecture:

1. **Which section type** organizes the content (Single, Channel, Structure)
2. **Which entry types** define its shape (global, reusable across contexts)
3. **Which relation strategy** connects content together (Entries fields, Matrix, CKEditor nested entries, or a combination)

## CMS Editions

Craft CMS has four editions (Solo, Team, Pro, Enterprise) that affect content modeling. The key distinction: if any section needs multiple custom user groups with per-group edit/view restrictions, you need **Pro or Enterprise** (multiple custom user groups are Pro+ only). Team includes one fixed "Team" group whose permissions are customizable for non-admins, plus a 5-user cap. See `references/users-and-permissions.md` for the full editions table and permissions architecture.

Choose the edition before modeling — it determines whether you can scope content access by user group, which affects section and field architecture.

## Section Type Decision

| Need | Section Type | URI Example |
|------|-------------|-------------|
| One-off page (homepage, about, contact) | **Single** | `__home__`, `about` |
| Site-wide settings (footer, header config) | **Single** (no URI, `preloadSingles`) | — |
| Flat collection (blog, news, events) | **Channel** | `blog/{slug}` |
| Hierarchical pages (docs, services) | **Structure** | `{parent.uri}/{slug}` |
| Taxonomy (topics, categories) | **Structure** (replaces categories) | `topics/{slug}` |
| Flat tags | **Channel** (replaces tags) | — |

### Section Properties

Beyond the type, sections have settings that matter for content architecture:

- **`maxAuthors`** (default 1) — allows multiple authors per entry (new in 5.0.0). Set higher for collaborative content.
- **`minAuthors`** (default 1, new in 5.10) — minimum number of authors required to save an entry. Set `1` to enforce that every entry has at least one author. Validated on save; setting `minAuthors > maxAuthors` is rejected by Craft's section validator. Combine with `maxAuthors` to define an exact range (`min: 1, max: 3` = "1 to 3 authors required").
- **`enableVersioning`** (default true) — version history for entries
- **`defaultPlacement`** — `'beginning'` or `'end'` for new entries in structures
- **`previewTargets`** — array of `{label, urlFormat}` objects defining where entries can be previewed. Default: primary entry page. Add custom targets for headless frontends, staging URLs, or PDF previews.

### Singles replace globals

Set `preloadSingles => true` in `config/general.php` to access singles as global
Twig variables by handle — identical to the old globals behavior but with drafts,
revisions, live preview, and scheduling.

```twig
{# With preloadSingles enabled #}
{{ siteSettings.footerText }}
{{ siteSettings.socialLinks.all() }}
```

**Caveat:** Singles always propagate to all sites. This is hard-coded.

### Structure queries for navigation

```twig
{% set topLevel = craft.entries.section('pages').level(1).all() %}
{% set children = craft.entries.descendantOf(entry).descendantDist(1).all() %}
{% set breadcrumbs = craft.entries.ancestorOf(entry).all() %}
{% set siblings = craft.entries.siblingOf(entry).all() %}
```

## Entry Types in Craft 5

Entry types are defined globally (Settings → Entry Types), then attached to
sections and Matrix fields. One entry type can serve multiple contexts.

Key implications:
- Changing an entry type's field layout affects **every** section and Matrix field using it
- Fields come from the global pool — same field definition reused everywhere
- Per-context name/handle/description overrides available (5.6.0+) — useful when the same entry type serves different purposes in different sections
- The global pool demands careful field naming — use specific handles

### Entry Type Visual Identity (Craft 5 new)

Entry types have visual properties that improve the editorial experience:

- **`icon`** — custom icon identifier, shown in entry type selectors and Matrix "+" menus
- **`color`** — one of 20 options (red, orange, amber, yellow, lime, green, emerald, teal, cyan, sky, blue, indigo, violet, purple, fuchsia, pink, rose, white, gray, black)
- **`description`** (5.8.0) — help text explaining what this entry type is for
- **`group`** (5.8.0) — collapsible grouping in section/Matrix entry type assignments
- **`uiLabelFormat`** (5.9.0) — customize the label shown in element indexes (default `'{title}'`)
- **`hasTitleField`** / **`titleFormat`** — disable the title field and auto-generate from other fields
- **`showSlugField`** (5.0.0) / **`showStatusField`** (4.5.0) — hide slug or status from editors
- **`allowLineBreaksInTitles`** (5.9.0) — for long-form titles

These settings are configured in Settings → Entry Types and affect all contexts where the entry type is used.

### Reserved handles — check every proposed field handle against this list

Craft has **83+ reserved handles** across all element types via `Field::RESERVED_HANDLES`. Validation is case-insensitive. Using any of these as a custom field handle will cause a validation error or silent template collision where the native attribute shadows the custom field.

**Before proposing any field handle in a content model, check it against the lists below.** When a user asks for a field that matches a native attribute name, always use a domain-specific synonym. For example: user says "I need a title field" — the entry already has a native `title`, so use `heading`, `headline`, or `pageTitle` depending on context.

**Most commonly collided (the ones you'll actually try to use):**

| Reserved | Use Instead | Why |
|----------|-------------|-----|
| `title` | `heading`, `headline`, `label`, `pageTitle` | Native element title |
| `slug` | `urlSlug`, `handle` | Native URL slug |
| `status` | `state`, `phase`, `condition` | Native element status |
| `url` | `externalUrl`, `targetUrl`, `websiteUrl` | Native element URL |
| `link` | `targetLink`, `ctaLink`, `primaryLink` | Native `getLink()` method |
| `icon` | `entryIcon`, `menuIcon`, `featureIcon` | Native element icon (5.0.0) |
| `parent` | `parentEntry`, `parentItem`, `belongsTo` | Native structure parent |
| `children` | `childEntries`, `subItems`, `nestedItems` | Native structure children |
| `owner` | `entryOwner`, `ownerElement` | Native nested entry owner |
| `site` | `location`, `branch`, `region` | Native site object |
| `level` | `depth`, `tier`, `nestingLevel` | Native structure level |
| `ancestors` | `parentChain`, `breadcrumbEntries` | Native structure ancestors |
| `siblings` | `peerEntries`, `relatedSiblings` | Native structure siblings |
| `enabled` | `isActive`, `isPublished`, `isVisible` | Native enabled/disabled state |
| `language` | `locale`, `contentLanguage` | Native site language |
| `localized` | `translations`, `localizedVersions` | Native localized entries query |
| `next` / `prev` | `nextEntry` / `prevEntry` | Native structure navigation |
| `ref` | `reference`, `referenceCode` | Native reference tag |
| `type` | `entryType`, `category`, `variant` | Native entry type |
| `author` / `authors` | `writer`, `creator`, `contributor` | Native entry author(s) |
| `postDate` | `publishDate`, `releaseDate`, `goLiveDate` | Native entry post date |

**Full list of reserved handles shared across ALL element types** (from `Field::RESERVED_HANDLES`):

`ancestors`, `archived`, `attributes`, `behaviors`, `canonical`, `children`, `contentTable`, `dateCreated`, `dateDeleted`, `dateLastMerged`, `dateUpdated`, `descendants`, `draftId`, `enabled`, `enabledForSite`, `error`, `errors`, `fieldLayoutId`, `fieldValue`, `fieldValues`, `firstSave`, `icon`, `id`, `language`, `level`, `lft`, `link`, `localized`, `next`, `nextSibling`, `owner`, `parent`, `parents`, `prev`, `prevSibling`, `ref`, `revisionId`, `rgt`, `root`, `searchScore`, `siblings`, `site`, `siteId`, `siteSettingsId`, `slug`, `sortOrder`, `status`, `structureId`, `title`, `trashed`, `uid`, `uri`, `url`, `viewMode`

**Additional per-element-type reserved handles:**

| Element Type | Additional Reserved |
|---|---|
| **Entries** | `author`, `authorId`, `authorIds`, `authors`, `section`, `sectionId`, `type`, `postDate` |
| **Assets** | `alt`, `extension`, `filename`, `folder`, `height`, `kind`, `size`, `volume`, `width` |
| **Users** | `active`, `addresses`, `admin`, `affiliatedSiteId`, `email`, `firstName`, `friendlyName`, `fullName`, `groups`, `lastName`, `locked`, `name`, `password`, `pending`, `photo`, `suspended`, `username` |
| **Categories** | `group` |
| **Tags** | `group` |
| **Addresses** | `address`, `countryCode`, `fullName`, `latLong`, `organization`, `organizationTaxId` |

**Also globally reserved** (from `HandleValidator::$baseReservedWords`, applies to ALL handles): `attribute`, `attributeLabels`, `attributeNames`, `attributes`, `dateCreated`, `dateUpdated`, `errors`, `false`, `fields`, `handle`, `id`, `n`, `name`, `no`, `rules`, `this`, `true`, `uid`, `y`, `yes`

## Field Instances — Reuse Over Duplication

Fields are defined once globally, then **instanced** into field layouts. Each instance can override four properties without affecting the global definition:

- **Label** — different display name per context
- **Handle** — different template handle per context (5.0.0+)
- **Instructions** — context-specific help text
- **Required** — required in one layout, optional in another

This means a single `heroImage` Assets field can be placed in a Blog Post, a Service Page, and a Project entry type — each with different labels ("Hero Image", "Banner", "Cover Photo") and different required settings. The field definition, type, and settings are shared.

**The rule: reuse field definitions via instances. Only create a new field when the type or settings differ** (e.g., different allowed volumes, different source restrictions, different character limits). Don't create `blogHeroImage`, `serviceHeroImage`, `projectHeroImage` — create one `heroImage` and instance it.

**But don't reuse just because two fields look alike today.** Apply the single-responsibility test ([SRP](https://en.wikipedia.org/wiki/Single-responsibility_principle)): is there a *reasonable* scenario where one instance would need different settings — a different character limit, translation method, or allowed volumes? If yes, the similarity is incidental, not essential — make them separate fields. Over-reuse has costs that are hard to reverse later:

- **Search can't tell instances apart.** The index records keywords against the field, not the instance, so `summary::daisy` may match a `byline` instance of the same field ([documented](https://craftcms.com/docs/5.x/system/searching.html#multi-instance-fields)). If you rely on distinct field-scoped search, the fields must be separate. (Element-query *filtering* by the overridden handle — `.summary(x).byline(y)` — does work; only the **search index** is instance-blind.)
- **A few relational/`relatedTo` cases** are community-reported to need the *original* handle — verify per case if reused-field results look wrong.

### Multi-Instance vs Single-Instance Fields

A field's `isMultiInstance()` method controls whether it can appear **multiple times in the same layout** with different handles. This is determined by `dbType()` — fields that return `null` are single-instance.

| Category | Field Types | Multi-Instance | Reusable Across Layouts |
|----------|-------------|:--------------:|:-----------------------:|
| **Relational** | Entries, Assets, Categories, Tags, Users | Yes | Yes |
| **Simple** | Plain Text, Number, Email, URL, Color, Lightswitch, Money, Range, Time, Date/Time | Yes | Yes |
| **Option** | Dropdown, Checkboxes, Multi-Select, Radio Buttons, Button Group | Yes | Yes |
| **Structured** | Table, Link, Icon, Country | Yes | Yes |
| **Nested element** | Matrix, Content Block, Addresses | **No** | Yes (with caveats) |

**Single-instance caveats:** Matrix, Content Block, and Addresses fields CAN be reused across different entry types (placed in multiple field layouts), but they can only appear **once per layout** and their configuration is fully shared — changing the entry types or settings on a Matrix field affects every entry type using it. Reuse these when contexts genuinely share the same structure. Create separate fields when different contexts need different nested entry types or settings.

## Adding Fields to an Entry Type — Reuse-First Workflow

Before proposing any field in a content model change, you MUST:

1. **Enumerate the existing field pool.** Read `config/project/fields/` (or CP Settings → Fields). List every field with its type, handle, and key settings.
2. **For each proposed field, classify into one of three categories:**
   - **Reuse** — existing field with matching type and compatible settings. Instance it into the layout; optionally override label, handle, instructions, or required.
   - **Reuse with settings review** — existing field of the correct type but slightly different settings (e.g., different allowed volumes, different character limit). Propose whether settings can be unified so one definition serves both contexts. Flag this as a decision for the user.
   - **Create new** — no existing field matches by type or functional purpose. Justify why a new field is needed.
3. **Fo

…

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [michtio](https://github.com/michtio)
- **Source:** [michtio/craftcms-claude-skills](https://github.com/michtio/craftcms-claude-skills)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-michtio-craftcms-claude-skills-craft-content-modeling
- Seller: https://agentstack.voostack.com/s/michtio
- Browse the marketplace: https://agentstack.voostack.com/browse

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