Image Generation (AI SDK)

Official API-based image generation. Supports OpenAI and Google providers.

Script Directory

Agent Execution:

1. SKILL_DIR = this SKILL.md file's directory
2. Script path = ${SKILL_DIR}/scripts/main.ts

Preferences (EXTEND.md)

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

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

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

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

┌───────────┬───────────────────────────────────────────────────────────────────────────┐ │ Result │ Action │ ├───────────┼───────────────────────────────────────────────────────────────────────────┤ │ Found │ Read, parse, apply settings │ ├───────────┼───────────────────────────────────────────────────────────────────────────┤ │ Not found │ Use defaults │ └───────────┴───────────────────────────────────────────────────────────────────────────┘

EXTEND.md Supports: Default provider | Default quality | Default aspect ratio

Usage

# Basic
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "A cat" --image cat.png

# With aspect ratio
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "A landscape" --image out.png --ar 16:9

# High quality
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "A cat" --image out.png --quality 2k

# From prompt files
npx -y bun ${SKILL_DIR}/scripts/main.ts --promptfiles system.md content.md --image out.png

# With reference images (Google multimodal only)
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "Make blue" --image out.png --ref source.png

# Specific provider
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "A cat" --image out.png --provider openai

Options

Option	Description
--prompt <text>, -p	Prompt text
--promptfiles <files...>	Read prompt from files (concatenated)
--image <path>	Output image path (required)
--provider google\|openai	Force provider (default: google)
--model <id>, -m	Model ID
--ar <ratio>	Aspect ratio (e.g., 16:9, 1:1, 4:3)
--size <WxH>	Size (e.g., 1024x1024)
--quality normal\|2k	Quality preset (default: 2k)
--imageSize 1K\|2K\|4K	Image size for Google (default: from quality)
--ref <files...>	Reference images (Google multimodal only)
--n <count>	Number of images
--json	JSON output

Environment Variables

Variable	Description
OPENAI_API_KEY	OpenAI API key
GOOGLE_API_KEY	Google API key
OPENAI_IMAGE_MODEL	OpenAI model override
GOOGLE_IMAGE_MODEL	Google model override
OPENAI_BASE_URL	Custom OpenAI endpoint
GOOGLE_BASE_URL	Custom Google endpoint

Load Priority: CLI args > env vars > <cwd>/.baoyu-skills/.env > ~/.baoyu-skills/.env

Provider Selection

1. --provider specified → use it
2. Only one API key available → use that provider
3. Both available → default to Google

Quality Presets

Preset	Google imageSize	OpenAI Size	Use Case
normal	1K	1024px	Quick previews
2k (default)	2K	2048px	Covers, illustrations, infographics

Google imageSize: Can be overridden with --imageSize 1K|2K|4K

Aspect Ratios

Supported: 1:1, 16:9, 9:16, 4:3, 3:4, 2.35:1

• Google multimodal: uses imageConfig.aspectRatio
• Google Imagen: uses aspectRatio parameter
• OpenAI: maps to closest supported size

Parallel Generation

Supports concurrent image generation via background subagents for batch operations.

Setting	Value
Recommended concurrency	4 subagents
Max concurrency	8 subagents
Use case	Batch generation (slides, comics, infographics)

Agent Implementation:

# Launch multiple generations in parallel using Task tool
# Each Task runs as background subagent with run_in_background=true
# Collect results via TaskOutput when all complete

Best Practice: When generating 4+ images, spawn background subagents (recommended 4 concurrent) instead of sequential execution.

Error Handling

• Missing API key → error with setup instructions
• Generation failure → auto-retry once
• Invalid aspect ratio → warning, proceed with default
• Reference images with non-multimodal model → warning, ignore refs

Extension Support

Custom configurations via EXTEND.md. See Preferences section for paths and supported options.