freestylefly 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):
# 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
# 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
--refprovided + no--provider→ auto-select Google first, then OpenAI, then Canghe--providerspecified → use it (if--ref, must begoogleoropenaiorcanghe)- 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
aspectRatioparameter - 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.