Image Generation (AI SDK)

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

bash

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

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

┌──────────────────────────────────────────────────┬───────────────────┐ │ Path │ Location │ ├──────────────────────────────────────────────────┼───────────────────┤ │ .canghe-skills/canghe-image-gen/EXTEND.md │ Project directory │ ├──────────────────────────────────────────────────┼───────────────────┤ │ $HOME/.canghe-skills/canghe-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 | Default image size | Default models

Schema:

references/config/preferences-schema.md

Usage

bash

# 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 or OpenAI edits)
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "Make blue" --image out.png --ref source.png

# With reference images (explicit provider/model)
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "Make blue" --image out.png --provider google --model gemini-3-pro-image-preview --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

# Canghe third-party gateway
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "一只可爱的猫" --image out.png --provider canghe

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\|canghe`	Force provider (default: google)
`--model <id>` , `-m`	Model ID ( `--ref` with OpenAI requires GPT Image model, e.g. `gpt-image-1.5` )
`--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. Supported by Google multimodal, OpenAI edits (GPT Image models), and Canghe ( `image_url` ). If provider omitted: Google first, then OpenAI, then Canghe
`--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)
`CANGHE_API_KEY`	Canghe API key
`OPENAI_IMAGE_MODEL`	OpenAI model override
`GOOGLE_IMAGE_MODEL`	Google model override
`DASHSCOPE_IMAGE_MODEL`	DashScope model override (default: z-image-turbo)
`CANGHE_IMAGE_MODEL`	Canghe model override (default: gemini-3-pro-image-preview)
`OPENAI_BASE_URL`	Custom OpenAI endpoint
`GOOGLE_BASE_URL`	Custom Google endpoint
`DASHSCOPE_BASE_URL`	Custom DashScope endpoint
`CANGHE_BASE_URL`	Custom Canghe endpoint (default: `https://api.canghe.ai/v1` )

Load Priority: CLI args > EXTEND.md > env vars >

<cwd>/.canghe-skills/.env

~/.canghe-skills/.env

Provider Selection

```
--ref
```
provided + no
```
--provider
```
→ auto-select Google first, then OpenAI, then Canghe
```
--provider
```
specified → use it (if
```
--ref
```
, must be
```
google
```
or
```
openai
```
or
```
canghe
```
)
Only one API key available → use that provider
Multiple 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

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 unsupported provider/model → error with fix hint (switch to Google multimodal or OpenAI GPT Image edits)

Extension Support

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

canghe-image-gen

NPX Install

Tags

SKILL.md Content