Image Generation (AI SDK)

Official API-based image generation. Supports OpenAI, Google and DashScope (阿里通义万象) providers.

Script Directory

Agent Execution:

SKILL_DIR = this SKILL.md file's directory
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

# DashScope (阿里通义万象)
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "一只可爱的猫" --image out.png --provider dashscope

Options

Option

Description

--prompt <text>, -p

Prompt text

--promptfiles <files...>

Read prompt from files (concatenated)

--image <path>

Output image path (required)

--provider google|openai|dashscope

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

DASHSCOPE_API_KEY

DashScope API key (阿里云)

OPENAI_IMAGE_MODEL

OpenAI model override

GOOGLE_IMAGE_MODEL

Google model override

DASHSCOPE_IMAGE_MODEL

DashScope model override (default: z-image-turbo)

OPENAI_BASE_URL

Custom OpenAI endpoint

GOOGLE_BASE_URL

Custom Google endpoint

DASHSCOPE_BASE_URL

Custom DashScope endpoint

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

Provider Selection

--provider specified → use it
Only one API key available → use that provider
Multiple available → default to Google

Quality Presets

Preset

Google imageSize

OpenAI Size

Use Case

normal

1024px

Quick previews

2k (default)

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

Generation Mode

Default: Sequential generation (one image at a time). This ensures stable output and easier debugging.

Parallel Generation: Only use when user explicitly requests parallel/concurrent generation.

Mode

When to Use

Sequential (default)

Normal usage, single images, small batches

Parallel

User explicitly requests, large batches (10+)

Parallel Settings (when requested):

Setting

Value

Recommended concurrency

4 subagents

Max concurrency

8 subagents

Use case

Large batch generation when user requests parallel

Agent Implementation (parallel mode only):

# 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

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.