Page Decomposition
Analyze content sequences within a section and provide neutral descriptions without assigning block names.
When to Use This Skill
This skill is called by identify-page-structure for EACH section to:
- Identify content sequences within that section
- Provide neutral descriptions (NO block names yet)
- Identify breaking points between sequences
- Enable authoring-focused decisions later
IMPORTANT: This skill analyzes ONE section at a time, not the whole page.
Input Required
From the calling skill (identify-page-structure), you need:
- Section visual description and boundaries
- Screenshot showing the section
- Cleaned HTML content for the section
Related Skills
- page-import - Top-level orchestrator
- identify-page-structure - Invokes this skill for each section (Step 2b)
- block-inventory - Provides available blocks AFTER decomposition
- content-modeling - Makes authoring decisions AFTER decomposition
- content-driven-development - References section structure in html-structure.md
Key Concepts
Content Hierarchy:
DOCUMENT
├── SECTION (top-level, analyzed by identify-page-structure Step 2a)
│ ├── Content Sequence 1 ← THIS SKILL IDENTIFIES THESE
│ ├── Content Sequence 2 ← THIS SKILL IDENTIFIES THESE
│ └── ...
└── SECTION
└── Content Sequence 1
What is a "content sequence"?
A vertical flow of related content that will eventually become:
- Default content (headings, paragraphs, lists, inline images), OR
- A block (structured, repeating, or interactive component)
Breaking points between sequences:
- Visual/semantic shift in content type
- Change from prose → structured pattern
- Change from one pattern → different pattern
Philosophy:
- Describe WHAT you see, not WHAT it should be
- "Two images side-by-side" not "Columns block"
- "Grid of 8 items with icons" not "Cards block"
- Stay neutral - authoring decisions come later
Decomposition Workflow
Context: identify-page-structure has already identified section boundaries (Step 2a). This skill is invoked FOR ONE SECTION to analyze its internal content sequences.
Step 1: Examine the Section
Look at the screenshot and HTML for THIS section only.
What to observe:
- Vertical flow of content from top to bottom
- Where content changes type or pattern
- Visual groupings or breaks
Ignore:
- Other sections (out of scope)
- Section styling (already identified by page-import)
- Block names (stay neutral)
Output: Mental model of content flow within this section
Step 2: Identify Breaking Points
Find where content shifts from one type/pattern to another.
Breaking point indicators:
- Prose text → Structured grid
- Heading/paragraph → Side-by-side images
- One repeating pattern → Different repeating pattern
- Structured content → Prose text
Example within a section:
Content flows top to bottom:
- Large heading
- Paragraph
- Two buttons
[BREAK] ← Visual/semantic shift
- Two images displayed side-by-side
Output: List of breaking points
Step 3: Define Content Sequences
Between each breaking point is a content sequence.
For each sequence, describe:
- What elements it contains (heading, paragraph, images, etc.)
- How they're arranged (stacked, side-by-side, in a grid)
- Quantity (one heading, two images, grid of 8 items)
Use neutral language:
- ✅ "Two images displayed side-by-side"
- ❌ "Columns block with two images"
- ✅ "Grid of 8 items, each with icon and short text"
- ❌ "Cards block"
- ✅ "Large centered heading, paragraph, two buttons stacked vertically"
- ❌ "Hero block"
Output: Neutral descriptions for each sequence
Step 4: Return Structured Output
Provide content sequences for this section in structured format.
Output format:
{
sectionNumber: 1, // From identify-page-structure
sequences: [
{
sequenceNumber: 1,
description: "Large centered heading, paragraph, two buttons stacked vertically"
},
{
sequenceNumber: 2,
description: "Two images displayed side-by-side"
}
]
}
This enables:
- Clear understanding of section's internal structure
- Neutral foundation for authoring decisions
- Separation of description from implementation
Section Metadata Format
Table format:
+------------------------------+
| Section Metadata |
+------------------+-----------+
| style | light |
+------------------+-----------+
Placement: At the start of each section, before content
Usage: Applied by generate-import-html skill when generating final HTML
Examples
Example 1: Hero Section
Input: "Section 1 (light background): Large prominent content at top of page"
Visual observation:
- Large centered heading
- Paragraph text below it
- Two call-to-action buttons
[BREAK - visual shift]
- Two large images displayed next to each other
Output:
{
sectionNumber: 1,
sequences: [
{
sequenceNumber: 1,
description: "Large centered heading, paragraph, two call-to-action buttons stacked vertically"
},
{
sequenceNumber: 2,
description: "Two large images displayed side-by-side"
}
]
}
Example 2: Features Section
Input: "Section 2 (light background): Grid of feature items"
Visual observation:
- Centered heading
[BREAK - shift to structured pattern]
- Grid of 8 items
- Each item has: small icon, short text description
[BREAK - shift back to simple elements]
- Two centered buttons
Output:
{
sectionNumber: 2,
sequences: [
{
sequenceNumber: 1,
description: "Single centered heading"
},
{
sequenceNumber: 2,
description: "Grid of 8 items, each with small icon and short text description"
},
{
sequenceNumber: 3,
description: "Two centered buttons"
}
]
}
Example 3: Article Cards Section
Input: "Section 3 (grey background): Blog articles"
Visual observation:
- Eyebrow text "Latest Articles"
- Large heading
- Paragraph description
- Browse button
[BREAK - shift to repeating pattern]
- 4 items in grid
- Each item: image, category tag, heading, short description, read link
Output:
{
sectionNumber: 3,
sequences: [
{
sequenceNumber: 1,
description: "Eyebrow text, large heading, paragraph description, browse button - all stacked vertically"
},
{
sequenceNumber: 2,
description: "Grid of 4 items, each with image, category tag, heading, description, and read link"
}
]
}
Example 4: Simple Content Section
Input: "Section 4 (light background): Body content"
Visual observation:
- Multiple paragraphs of text
- Some inline images within the text
- Headings interspersed (H2, H3)
- No clear breaking points - content flows naturally
Output:
{
sectionNumber: 4,
sequences: [
{
sequenceNumber: 1,
description: "Flowing prose content: multiple paragraphs with inline images and headings (H2, H3)"
}
]
}
Note: This entire section is one sequence because content flows naturally without structural breaks.
Common Mistakes to Avoid
Using block names in descriptions:
❌ "Hero block with heading and buttons"
✓ "Large centered heading, paragraph, two buttons stacked vertically"
Not identifying breaking points:
❌ Describing entire section as one sequence when there are clear shifts
✓ Identifying where content type changes and breaking into sequences
Being too granular:
❌ Each element as separate sequence: "Heading", "Paragraph", "Button"
✓ Related elements together: "Heading, paragraph, two buttons stacked vertically"
Mixing analysis levels:
❌ Analyzing multiple sections at once
✓ Focus on ONE section at a time (per invocation)
Making authoring decisions:
❌ "This should be a cards block because..."
✓ "Grid of 4 items with images and text" (neutral description)
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