/happy-image-gen

name: happy-image-gen
description: Universal AI image generation supporting OpenAI DALL·E / gpt-image, Google Gemini Image / Imagen, Replicate (Flux / SDXL / any model), Stability AI, FAL, Ark (Seedream 4.5), Bailian (qwen-image / wanx), and SiliconFlow. Use this skill whenever the user asks to generate, create, draw, illustrate, render, or synthesize images from text prompts or reference images. Typical phrases include "draw a ...", "generate an image of ...", "画一张 ...", "给我来张图", "make a poster of ...", "create an illustration ...", or any mention of image-generation model families like DALL·E, gpt-image, Flux, SDXL, Seedream, Imagen, Gemini image, Kolors, or Wanx. Always use this skill even if the user does not name a specific model — pick a provider based on their EXTEND.md defaults or available API keys in the environment. Do NOT use this skill when the user explicitly mentions 即梦 / Dreamina / Jimeng — those go to happy-dreamina instead.
version: 0.1.0

happy-image-gen

Generates still images across 8 providers through one CLI: `bun scripts/main.ts ...`. The same CLI handles text-to-image and image-to-image (reference-driven) edits.

Quick usage

bun scripts/main.ts --prompt "A calico cat on green grass, cinematic light" --ar 16:9 --image ./out.png

When to invoke this skill

Invoke this skill whenever the user:

• Asks to generate, create, draw, render, illustrate, or synthesize an image from text.
• Asks to restyle or transform an existing image they provide a path to.
• Names any image-generation model (DALL·E, gpt-image, Flux, SDXL, Gemini Image, Imagen, Seedream, Kolors, Wanx, Stable Diffusion) without specifying 即梦/Dreamina/Jimeng.

Route to `happy-dreamina` instead when the user explicitly names 即梦, Jimeng, or the `dreamina` CLI.

Step 0: Preflight (BLOCKING — run before any generation)

Run these checks:

1. **Locate EXTEND.md config.** Check in order:

• `./.happy-skills/happy-image-gen/EXTEND.md` (project)
• `$XDG_CONFIG_HOME/happy-skills/happy-image-gen/EXTEND.md`
• `~/.happy-skills/happy-image-gen/EXTEND.md` (user)

If none exist, run `bun scripts/main.ts --setup` and follow `references/config/first-time-setup.md` to create one. Do not proceed to generation until the user has at least one provider configured.

2. **Verify a provider is usable.** Confirm either an env var is set (e.g., `OPENAI_API_KEY`) or EXTEND.md references an `api_key_env` / `api_key_source` that resolves. If nothing resolves, loop back to setup.

3. **Verify Bun is available.** Run `command -v bun`. If missing, fall back to `npx -y bun scripts/main.ts ...`.

Step 1: Choose a provider

Pick in this order of preference:

1. `--provider <id>` explicitly passed by the user. 2. The `default_provider` in EXTEND.md. 3. The first provider whose API key is present in the environment. Priority when auto-detecting: `openai` → `google` → `replicate` → `stability` → `fal` → `ark` → `bailian` → `siliconflow`.

See `references/providers.md` for each provider's required env vars, default models, and strengths (e.g., prefer `google` for text-in-image, `replicate` for Flux-family photorealism, `ark` for Chinese text fidelity).

Step 2: Fill in parameters

• **`--prompt`**: the user's full request, trimmed. Always double-quote.
• **`--ar`**: aspect ratio — `1:1` / `16:9` / `9:16` / `3:4` / `4:3`. See `references/aspect_ratio_map.md` for how each provider interprets this.
• **`--quality`**: `draft` (fastest + cheapest), `hd` (default), or `ultra` (4K-class, slower).
• **`--ref <path>`**: repeat for multiple reference images. Not every provider supports this — see providers.md.
• **`--model`**: override the default model for the chosen provider. Omit unless the user asked for a specific one.
• **`--image <path>`**: REQUIRED — output file path. Use a descriptive name (e.g., `./out/hero-landscape.png`).

Step 3: Run

bun scripts/main.ts \
  --prompt "..." \
  --image ./out.png \
  --provider openai \
  --ar 1:1 \
  --quality hd

On success the CLI prints the resolved absolute path and byte count. In `--json` mode it emits:

{ "success": true, "provider": "openai", "model": "gpt-image-1", "image": "/abs/path.png", "size_bytes": 1416341, "format": "png" }

Echo the path back to the user.

Step 4: Handle errors

• **`config: No provider selected ...`** — no API key in env and no EXTEND.md. Loop back to Step 0.
• **`[openai] OpenAI images API 401 ...`** — key invalid or expired. Ask the user to refresh it.
• **`[openai] ... 400 ... content_policy_violation`** — prompt blocked. Show the raw error to the user; do not paraphrase.
• **Timeouts / network errors** — retry once. If still failing, surface the raw message and `provider` so the user knows what to check.

See `references/error_codes.md` for a per-provider error table.

References

Read on demand:

• **`references/providers.md`** — all 8 providers, required env vars, default models, strengths.
• **`references/aspect_ratio_map.md`** — how each provider interprets `--ar`.
• **`references/error_codes.md`** — common errors per provider and fixes.
• **`references/config/first-time-setup.md`** — step-by-step for `--setup`.
• **`references/config/extend-schema.md`** — EXTEND.md schema reference.

Template for `EXTEND.md`: `assets/EXTEND.template.md`.