Agent-Skills.md

Agent Skills: Cover Image Generator

Generates article cover images with 4 dimensions (type, style, text, mood) and 20 hand-drawn styles. Supports cinematic (2.35:1), widescreen (16:9), and square (1:1) aspects. Use when user asks to "generate cover image", "create article cover", "make cover", or mentions "封面图".

UncategorizedID: Jst-Well-Dan/Skill-Box/baoyu-cover-image

Repository

Jst-Well-Dan/Skill-Box
Jst-Well-Dan
74

Install this agent skill to your local

pnpm dlx add-skill https://github.com/Jst-Well-Dan/Skill-Box/tree/HEAD/content-pipeline/baoyu-cover-image

Skill Files

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content-pipeline/baoyu-cover-image/SKILL.md

Skill Metadata

Name
baoyu-cover-image
Description
Generates article cover images with 4 dimensions (type, style, text, mood) and 20 hand-drawn styles. Supports cinematic (2.35:1), widescreen (16:9), and square (1:1) aspects. Use when user asks to "generate cover image", "create article cover", "make cover", or mentions "封面图".

Cover Image Generator

Generate elegant cover images for articles with 4-dimensional customization.

Usage

# Auto-select all dimensions based on content
/baoyu-cover-image path/to/article.md

# Quick mode: skip confirmation, use auto-selection
/baoyu-cover-image article.md --quick

# Specify dimensions
/baoyu-cover-image article.md --type conceptual --style blueprint
/baoyu-cover-image article.md --text title-subtitle --mood bold

# Visual only (no title text)
/baoyu-cover-image article.md --no-title

# Direct content input
/baoyu-cover-image
[paste content]

# Direct input with options
/baoyu-cover-image --style notion --aspect 1:1 --quick
[paste content]

Options

| Option | Description | |--------|-------------| | --type <name> | Cover type: hero, conceptual, typography, metaphor, scene, minimal | | --style <name> | Cover style (see Style Gallery) | | --text <level> | Text density: none, title-only, title-subtitle, text-rich | | --mood <level> | Emotional intensity: subtle, balanced, bold | | --aspect <ratio> | 16:9 (default), 2.35:1, 4:3, 3:2, 1:1, 3:4 | | --lang <code> | Title language (en, zh, ja, etc.) | | --no-title | Alias for --text none | | --quick | Skip confirmation, use auto-selection for missing dimensions |

Four Dimensions

| Dimension | Controls | Values | Default | |-----------|----------|--------|---------| | Type | Visual composition, information structure | hero, conceptual, typography, metaphor, scene, minimal | auto | | Style | Visual aesthetics, colors, technique | 20 built-in styles | auto | | Text | Text density, information hierarchy | none, title-only, title-subtitle, text-rich | title-only | | Mood | Emotional intensity, visual weight | subtle, balanced, bold | balanced |

Dimensions can be freely combined. Example: --type conceptual --style blueprint --text title-only --mood subtle creates a calm technical concept visualization.

Type Gallery

| Type | Description | Best For | |------|-------------|----------| | hero | Large visual impact, title overlay | Product launch, brand promotion, major announcements | | conceptual | Concept visualization, abstract core ideas | Technical articles, methodology, architecture design | | typography | Text-focused layout, prominent title | Opinion pieces, quotes, insights | | metaphor | Visual metaphor, concrete expressing abstract | Philosophy, growth, personal development | | scene | Atmospheric scene, narrative feel | Stories, travel, lifestyle | | minimal | Minimalist composition, generous whitespace | Zen, focus, core concepts |

Auto Type Selection

When --type is omitted, select based on content signals:

| Signals | Type | |---------|------| | Product, launch, announcement, release, reveal | hero | | Architecture, framework, system, API, technical, model | conceptual | | Quote, opinion, insight, thought, headline, statement | typography | | Philosophy, growth, abstract, meaning, reflection | metaphor | | Story, journey, travel, lifestyle, experience, narrative | scene | | Zen, focus, essential, core, simple, pure | minimal |

Style Gallery

| Style | Description | |-------|-------------| | elegant (default) | Refined, sophisticated | | blueprint | Technical schematics | | bold-editorial | Magazine impact | | chalkboard | Chalk on blackboard | | dark-atmospheric | Cinematic dark mode | | editorial-infographic | Visual storytelling | | fantasy-animation | Ghibli/Disney inspired | | flat-doodle | Pastel, cute shapes | | intuition-machine | Technical, bilingual | | minimal | Ultra-clean, zen | | nature | Organic, earthy | | notion | SaaS dashboard | | pixel-art | Retro 8-bit | | playful | Fun, whimsical | | retro | Halftone, vintage | | sketch-notes | Hand-drawn, warm | | vector-illustration | Flat vector | | vintage | Aged, expedition | | warm | Friendly, human | | watercolor | Soft hand-painted |

Style definitions: references/styles/

Auto Style Selection

When --style is omitted, select based on content signals:

| Signals | Style | |---------|-------| | Architecture, system design | blueprint | | Product launch, marketing | bold-editorial | | Education, tutorial | chalkboard | | Entertainment, premium | dark-atmospheric | | Tech explainer, research | editorial-infographic | | Fantasy, children | fantasy-animation | | Technical docs, bilingual | intuition-machine | | Personal story, emotion | warm | | Zen, focus, essential | minimal | | Fun, beginner, casual | playful | | Nature, wellness, eco | nature | | SaaS, dashboard | notion | | Workflow, productivity | flat-doodle | | Gaming, retro tech | pixel-art | | Knowledge sharing | sketch-notes | | Creative proposals | vector-illustration | | History, exploration | vintage | | Lifestyle, travel | watercolor | | Business, professional | elegant |

Text Dimension

| Value | Title | Subtitle | Tags | Use Case | |-------|:-----:|:--------:|:----:|----------| | none | - | - | - | Pure visual, no text | | title-only | ✓ (≤8字) | - | - | Simple headline (default) | | title-subtitle | ✓ | ✓ (≤15字) | - | Title + supporting context | | text-rich | ✓ | ✓ | ✓ (2-4) | Information-dense |

Full guide: references/dimensions/text.md

Auto Text Selection

When --text is omitted, select based on content signals:

| Signals | Text Level | |---------|------------| | Visual-only, photography, abstract, art | none | | Article, blog, standard cover | title-only | | Series, tutorial, technical with context | title-subtitle | | Announcement, features, multiple points, infographic | text-rich |

Default: title-only

Mood Dimension

| Value | Contrast | Saturation | Weight | Use Case | |-------|:--------:|:----------:|:------:|----------| | subtle | Low | Muted | Light | Corporate, thought leadership | | balanced | Medium | Normal | Medium | General articles (default) | | bold | High | Vivid | Heavy | Announcements, promotions |

Full guide: references/dimensions/mood.md

Auto Mood Selection

When --mood is omitted, select based on content signals:

| Signals | Mood Level | |---------|------------| | Professional, corporate, thought leadership, academic, luxury | subtle | | General, educational, standard, blog, documentation | balanced | | Launch, announcement, promotion, event, gaming, entertainment | bold |

Default: balanced

Compatibility Matrices

Type × Style

| | elegant | blueprint | notion | warm | minimal | watercolor | bold-editorial | dark-atmospheric | |---|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:| | hero | ✓✓ | ✓ | ✓ | ✓✓ | ✓ | ✓✓ | ✓✓ | ✓✓ | | conceptual | ✓✓ | ✓✓ | ✓✓ | ✓ | ✓✓ | ✗ | ✓ | ✓ | | typography | ✓✓ | ✓ | ✓✓ | ✓ | ✓✓ | ✓ | ✓✓ | ✓✓ | | metaphor | ✓✓ | ✗ | ✓ | ✓✓ | ✓ | ✓✓ | ✓ | ✓ | | scene | ✓ | ✗ | ✗ | ✓✓ | ✓ | ✓✓ | ✓ | ✓✓ | | minimal | ✓✓ | ✓ | ✓✓ | ✓ | ✓✓ | ✓ | ✗ | ✓ |

Type × Text

| | none | title-only | title-subtitle | text-rich | |---|:---:|:---:|:---:|:---:| | hero | ✓ | ✓✓ | ✓✓ | ✓ | | conceptual | ✓✓ | ✓✓ | ✓ | ✓ | | typography | ✗ | ✓ | ✓✓ | ✓✓ | | metaphor | ✓✓ | ✓ | ✓ | ✗ | | scene | ✓✓ | ✓ | ✓ | ✗ | | minimal | ✓✓ | ✓✓ | ✓ | ✗ |

Type × Mood

| | subtle | balanced | bold | |---|:---:|:---:|:---:| | hero | ✓ | ✓✓ | ✓✓ | | conceptual | ✓✓ | ✓✓ | ✓ | | typography | ✓ | ✓✓ | ✓✓ | | metaphor | ✓✓ | ✓✓ | ✓ | | scene | ✓✓ | ✓✓ | ✓ | | minimal | ✓✓ | ✓✓ | ✗ |

✓✓ = highly recommended | ✓ = compatible | ✗ = not recommended

File Structure

Each session creates an independent directory named by content slug:

cover-image/{topic-slug}/
├── source-{slug}.{ext}    # Source files (text, images, etc.)
├── prompts/cover.md       # Generation prompt
└── cover.png              # Output image

Slug Generation:

  1. Extract main topic from content (2-4 words, kebab-case)
  2. Example: "The Future of AI" → future-of-ai

Conflict Resolution: If cover-image/{topic-slug}/ already exists:

  • Append timestamp: {topic-slug}-YYYYMMDD-HHMMSS
  • Example: ai-future exists → ai-future-20260118-143052

Source Files: Copy all sources with naming source-{slug}.{ext}:

  • source-article.md, source-reference.png, etc.
  • Multiple sources supported: text, images, files from conversation

Workflow

Progress Checklist

Copy and track progress:

Cover Image Progress:
- [ ] Step 0: Check preferences (EXTEND.md) ⚠️ REQUIRED if not found
- [ ] Step 1: Analyze content
- [ ] Step 2: Confirm options (4 dimensions) ⚠️ REQUIRED unless --quick or all specified
- [ ] Step 3: Create prompt
- [ ] Step 4: Generate image
- [ ] Step 5: Completion report

Flow

Input → [Step 0: Preferences/Setup] → Analyze → [Confirm: 4 Dimensions] → Prompt → Generate → Complete
                                                      ↓
                                              (skip if --quick or all dimensions specified)

Step 0: Load Preferences (EXTEND.md) ⚠️

Purpose: Load user preferences or run first-time setup. Do NOT skip setup if EXTEND.md not found.

Use Bash to check EXTEND.md existence (priority order):

# Check project-level first
test -f .baoyu-skills/baoyu-cover-image/EXTEND.md && echo "project"

# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
test -f "$HOME/.baoyu-skills/baoyu-cover-image/EXTEND.md" && echo "user"

┌──────────────────────────────────────────────────┬───────────────────┐ │ Path │ Location │ ├──────────────────────────────────────────────────┼───────────────────┤ │ .baoyu-skills/baoyu-cover-image/EXTEND.md │ Project directory │ ├──────────────────────────────────────────────────┼───────────────────┤ │ $HOME/.baoyu-skills/baoyu-cover-image/EXTEND.md │ User home │ └──────────────────────────────────────────────────┴───────────────────┘

┌───────────┬───────────────────────────────────────────────────────────────────────────┐ │ Result │ Action │ ├───────────┼───────────────────────────────────────────────────────────────────────────┤ │ Found │ Read, parse, display preferences summary (see below) → Continue to Step 1 │ ├───────────┼───────────────────────────────────────────────────────────────────────────┤ │ Not found │ ⚠️ MUST run first-time setup (see below) → Then continue to Step 1 │ └───────────┴───────────────────────────────────────────────────────────────────────────┘

Preferences Summary (when EXTEND.md found):

Display loaded preferences:

Preferences loaded from [project/user]:
• Watermark: [enabled/disabled] [content if enabled]
• Type: [preferred_type or "auto"]
• Style: [preferred_style or "auto"]
• Text: [preferred_text or "title-only"]
• Mood: [preferred_mood or "balanced"]
• Aspect: [default_aspect]
• Quick mode: [enabled/disabled]
• Language: [language or "auto"]

First-Time Setup (when EXTEND.md not found):

Language: Use user's input language or saved language preference.

Use AskUserQuestion with ALL questions in ONE call:

Q1: Watermark

header: "Watermark"
question: "Watermark text for generated cover images?"
options:
  - label: "No watermark (Recommended)"
    description: "Clean covers, can enable later in EXTEND.md"

Q2: Preferred Type

header: "Type"
question: "Default cover type preference?"
options:
  - label: "Auto-select (Recommended)"
    description: "Choose based on content analysis each time"
  - label: "hero"
    description: "Large visual impact - product launch, announcements"
  - label: "conceptual"
    description: "Concept visualization - technical, architecture"

Q3: Preferred Style

header: "Style"
question: "Default cover style preference?"
options:
  - label: "Auto-select (Recommended)"
    description: "Choose based on content analysis each time"
  - label: "elegant"
    description: "Refined, sophisticated - professional business"
  - label: "notion"
    description: "SaaS dashboard - productivity/tech content"

Q4: Default Aspect Ratio

header: "Aspect"
question: "Default aspect ratio for cover images?"
options:
  - label: "16:9 (Recommended)"
    description: "Standard widescreen - YouTube, presentations, versatile"
  - label: "2.35:1"
    description: "Cinematic widescreen - article headers, blog posts"
  - label: "1:1"
    description: "Square - Instagram, WeChat, social cards"
  - label: "3:4"
    description: "Portrait - Xiaohongshu, Pinterest, mobile content"

Note: More ratios (4:3, 3:2) available during generation. This sets the default recommendation.

Q5: Quick Mode

header: "Quick"
question: "Enable quick mode by default?"
options:
  - label: "No (Recommended)"
    description: "Confirm dimension choices each time"
  - label: "Yes"
    description: "Skip confirmation, use auto-selection"

Q6: Save Location

header: "Save"
question: "Where to save preferences?"
options:
  - label: "Project (Recommended)"
    description: ".baoyu-skills/ (this project only)"
  - label: "User"
    description: "~/.baoyu-skills/ (all projects)"

After setup: Create EXTEND.md with user choices, then continue to Step 1.

Full setup details: references/config/first-time-setup.md

EXTEND.md Supports: Watermark | Preferred type | Preferred style | Preferred text | Preferred mood | Default aspect ratio | Quick mode | Custom style definitions | Language preference

Schema: references/config/preferences-schema.md

Step 1: Analyze Content

Read source content, save it if needed, and perform analysis.

Actions:

  1. Save source content (if not already a file):
    • If user provides a file path: use as-is
    • If user pastes content: save to source.md in target directory
  2. Read source content
  3. Content analysis:
    • Extract: topic, core message, tone, keywords
    • Identify visual metaphor opportunities
    • Detect content type (technical/personal/business/creative)
  4. Language detection:
    • Detect source content language
    • Note user's input language (from conversation)
    • Compare with language preference in EXTEND.md

Step 2: Confirm Options ⚠️

Purpose: Validate all 4 dimensions + aspect ratio.

Skip Conditions: | Condition | Skipped Questions | Still Asked | |-----------|-------------------|-------------| | --quick flag | Type, Style, Text, Mood | Aspect Ratio (unless --aspect specified) | | All 4 dimensions + --aspect specified | All | None | | quick_mode: true in EXTEND.md | Type, Style, Text, Mood | Aspect Ratio (unless --aspect specified) | | Otherwise | None | All 5 questions |

Important: Aspect ratio is ALWAYS asked unless explicitly specified via --aspect CLI flag. User presets in EXTEND.md are shown as recommended option, not auto-selected.

Quick Mode Output (when skipping 4 dimensions):

Quick Mode: Auto-selected dimensions
• Type: [type] ([reason])
• Style: [style] ([reason])
• Text: [text] ([reason])
• Mood: [mood] ([reason])

[Then ask Question 5: Aspect Ratio]

Confirmation Flow (when NOT skipping):

Language: Auto-determined (user's input language > saved preference > source language). No need to ask.

Present options using AskUserQuestion:

Question 1: Type (if not specified via --type)

  • Show recommended type based on content analysis + preferred type from EXTEND.md
header: "Type"
question: "Which cover type?"
multiSelect: false
options:
  - label: "[auto-recommended type] (Recommended)"
    description: "[reason based on content signals]"
  - label: "hero"
    description: "Large visual impact, title overlay - product launch, announcements"
  - label: "conceptual"
    description: "Concept visualization - technical, architecture"
  - label: "typography"
    description: "Text-focused layout - opinions, quotes"

Question 2: Style (if not specified via --style)

  • Based on selected Type, show compatible styles (✓✓ first from compatibility matrix)
  • Format: [style name] - [why it fits this content]
header: "Style"
question: "Which cover style?"
multiSelect: false
options:
  - label: "[best compatible style] (Recommended)"
    description: "[reason based on type + content]"
  - label: "[style2]"
    description: "[reason]"
  - label: "[style3]"
    description: "[reason]"

Question 3: Text (if not specified via --text)

  • Based on selected Type, show compatible text levels (✓✓ first from compatibility matrix)
header: "Text"
question: "Text density level?"
multiSelect: false
options:
  - label: "title-only (Recommended)"
    description: "Simple headline, ≤8 characters"
  - label: "none"
    description: "Pure visual, no text elements"
  - label: "title-subtitle"
    description: "Title + supporting context"
  - label: "text-rich"
    description: "Title + subtitle + keyword tags"

Question 4: Mood (if not specified via --mood)

  • Based on content analysis, show recommended mood
header: "Mood"
question: "Emotional intensity?"
multiSelect: false
options:
  - label: "balanced (Recommended)"
    description: "Medium contrast and saturation, versatile"
  - label: "subtle"
    description: "Low contrast, muted colors, calm"
  - label: "bold"
    description: "High contrast, vivid colors, dynamic"

Question 5: Aspect Ratio (ALWAYS ask unless --aspect specified via CLI)

Note: Even if user has a preset in EXTEND.md, still ask this question. The preset is shown as the recommended option.

header: "Aspect"
question: "Cover aspect ratio?"
multiSelect: false
options:
  - label: "[user preset or 16:9] (Recommended)"
    description: "[based on preset or default: Standard widescreen, versatile]"
  - label: "2.35:1"
    description: "Cinematic widescreen - article headers, blog posts"
  - label: "4:3"
    description: "Traditional screen - PPT slides, classic displays"
  - label: "3:2"
    description: "Photography ratio - blog articles, Medium posts"
  - label: "1:1"
    description: "Square - Instagram, WeChat moments, social cards"
  - label: "3:4"
    description: "Portrait - Xiaohongshu, Pinterest, mobile-first content"

After response: Proceed to Step 3 with confirmed dimensions.

Step 3: Create Prompt

Save to prompts/cover.md:

# Content Context
Article title: [full original title from source]
Content summary: [2-3 sentence summary of key points and themes]
Keywords: [5-8 key terms extracted from content]

# Visual Design
Cover theme: [2-3 words visual interpretation]
Type: [confirmed type]
Style: [confirmed style]
Text level: [confirmed text level]
Mood: [confirmed mood]
Aspect ratio: [confirmed ratio]
Language: [confirmed language]

# Text Elements
[Based on text level:]
- none: "No text elements"
- title-only: "Title: [max 8 chars headline]"
- title-subtitle: "Title: [headline] / Subtitle: [max 15 chars context]"
- text-rich: "Title: [headline] / Subtitle: [context] / Tags: [2-4 keywords]"

# Mood Application
[Based on mood level:]
- subtle: "Use low contrast, muted colors, light visual weight, calm aesthetic"
- balanced: "Use medium contrast, normal saturation, balanced visual weight"
- bold: "Use high contrast, vivid saturated colors, heavy visual weight, dynamic energy"

# Composition
Type composition:
- [Type-specific layout and structure]

Visual composition:
- Main visual: [metaphor derived from content meaning]
- Layout: [positioning based on type and aspect ratio]
- Decorative: [style elements that reinforce content theme]

Color scheme: [primary, background, accent from style, adjusted by mood]
Type notes: [key characteristics from type definition]
Style notes: [key characteristics from style definition]

[Watermark section if enabled]

Content-Driven Design:

  • Article title and summary inform the visual metaphor choice
  • Keywords guide decorative elements and symbols
  • The skill controls visual style; the content drives meaning

Type-Specific Composition:

| Type | Composition Guidelines | |------|------------------------| | hero | Large focal visual (60-70% area), title overlay on visual, dramatic composition | | conceptual | Abstract shapes representing core concepts, information hierarchy, clean zones | | typography | Title as primary element (40%+ area), minimal supporting visuals, strong hierarchy | | metaphor | Concrete object/scene representing abstract idea, symbolic elements, emotional resonance | | scene | Atmospheric environment, narrative elements, mood-setting lighting and colors | | minimal | Single focal element, generous whitespace (60%+), essential shapes only |

Title guidelines (when text level includes title):

  • Max 8 characters, punchy headline
  • Use hooks: numbers, questions, contrasts
  • Match confirmed language

Watermark Application (if enabled in preferences): Add to prompt:

Include a subtle watermark "[content]" positioned at [position]
with approximately [opacity*100]% visibility. The watermark should
be legible but not distracting from the main content.

Reference: references/config/watermark-guide.md

Step 4: Generate Image

Backup Existing Cover (if regenerating): If cover.png already exists in the output directory:

  • Rename to cover-backup-YYYYMMDD-HHMMSS.png

Image Generation Skill Selection:

  1. Check available image generation skills
  2. If multiple skills available, ask user preference
  3. Call selected skill with:
    • Prompt file path
    • Output image path: cover.png
    • Aspect ratio parameter

On failure: Auto-retry once before reporting error.

Step 5: Completion Report

Cover Generated!

Topic: [topic]
Type: [type name]
Style: [style name]
Text: [text level]
Mood: [mood level]
Aspect: [ratio]
Title: [title text or "visual only"]
Language: [lang]
Watermark: [enabled/disabled]
Location: [directory path]

Files:
✓ source-{slug}.{ext}
✓ prompts/cover.md
✓ cover.png
[✓ cover-backup-{timestamp}.png (if regenerated)]

Image Modification

| Action | Steps | |--------|-------| | Regenerate | Backup existing → Update prompt → Regenerate with same settings | | Change type | Backup existing → Confirm new type → Update prompt → Regenerate | | Change style | Backup existing → Confirm new style → Update prompt → Regenerate | | Change text | Backup existing → Confirm new text level → Update prompt → Regenerate | | Change mood | Backup existing → Confirm new mood → Update prompt → Regenerate | | Change aspect | Backup existing → Confirm new aspect → Update prompt → Regenerate |

All modifications automatically backup the existing cover.png before regenerating.

Notes

  • Cover must be readable at small preview sizes
  • Visual metaphors > literal representations
  • Title: max 8 chars, readable, impactful
  • Two confirmation points: Step 0 (first-time setup if no EXTEND.md) + Step 2 (options) - can skip Step 2 with --quick
  • Use confirmed language for title text
  • Maintain watermark consistency if enabled
  • Check compatibility matrices when selecting combinations
  • --no-title is preserved as alias for --text none

References

Dimensions:

  • references/dimensions/text.md - Text density dimension
  • references/dimensions/mood.md - Mood intensity dimension

Styles: references/styles/<name>.md - Style definitions

Config:

  • references/config/preferences-schema.md - EXTEND.md schema
  • references/config/first-time-setup.md - First-time setup flow
  • references/config/watermark-guide.md - Watermark configuration

Extension Support

Custom configurations via EXTEND.md. See Step 0 for paths and supported options.