invokeai-image-gen
Generate images using InvokeAI's local API. Use when asked to generate, create, or make images with InvokeAI, FLUX.2 Klein, Z-Image Turbo, FLUX, or SDXL models. Supports text-to-image generation, automatic model detection, image download, and parameter selection based on model architecture.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/sammcj/agentic-coding --skill invokeai-image-gen- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads invokeai-image-gen automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
InvokeAI Image Generation
Generate images via InvokeAI's REST API. Supports FLUX.2 Klein (default), Z-Image Turbo, FLUX.1, and SDXL.
Quick Start
Simply call the script with your prompt and the output file name:
python scripts/generate.py -p "A dramatic sunset over snow-capped mountains, warm orange light reflecting off a still alpine lake in the foreground. Soft clouds catch the fading light." -o sunset.png
Overriding The Default Model
If the user asks you to use a specific model, first find the model key, then use it in the command:
python scripts/generate.py --list-models | grep -i 'flux'
python scripts/generate.py -p "A tabby cat with bright green eyes sits on a weathered wooden windowsill, soft afternoon light streaming through lace curtains. Cosy, intimate mood." --model MODEL_KEY -o cat.png
Options
| Option | Description |
|---|---|
--prompt, -p | Generation prompt (required) |
--negative, -n | Negative prompt (SDXL only) |
--model, -m | Model key (UUID) or partial name match |
--width, -W / --height, -H | Dimensions |
--steps, -s | Denoising steps |
--cfg, -c | CFG scale |
--guidance, -g | Guidance strength (FLUX.1 only) |
--scheduler | Sampling scheduler |
--seed | Random seed |
--output, -o | Output path (default: invokeai-{seed}.png) |
--list-models | List installed models |
--json | JSON output |
Model Defaults
Note: FLUX.2 Klein is the latest model which is used by default.
| Model | Steps | Guidance | CFG | Scheduler |
|---|---|---|---|---|
| FLUX.2 Klein | 4 | 3.5 | 1.0 | euler |
| Z-Image Turbo | 9 | - | 1.0 | euler |
| FLUX.1 dev | 28 | 3.5 | 1.0 | euler |
| FLUX.1 Krea dev | 28 | 4.5 | 1.0 | euler |
| FLUX.1 Kontext dev | 28 | 2.5 | 1.0 | euler |
| FLUX.1 schnell | 4 | 0.0 | 1.0 | euler |
| SDXL | 25 | - | 6.0 | dpmpp_2m_k |
| SDXL Turbo | 8 | - | 1.0 | dpmpp_sde |
All models default to 1024x1024. FLUX requires dimensions divisible by 16, SDXL by 8.
FLUX.1 Variant Notes
- FLUX.1 dev: Standard text-to-image model, balanced quality/speed
- FLUX.1 Krea dev: Fine-tuned for aesthetic photography, use higher guidance (4.5)
- FLUX.1 Kontext dev: Image editing model, use lower guidance (2.5)
- FLUX.1 schnell: Distilled fast model, 4 steps, no guidance needed
Model Selection
Auto-priority: Klein > Z-Image > FLUX > SDXL
Detection by name/base:
- flux2_klein: "klein" in name or "flux2" in base
- flux_krea: "krea" in name (FLUX.1 base)
- flux_kontext: "kontext" in name (FLUX.1 base)
- flux_schnell: "schnell" in name (FLUX.1 base)
- flux: "flux" in base (standard dev)
- zimage: "z-image" in base or "z-image/zimage" in name
- sdxl: "sdxl" in base (turbo/lightning variants auto-detect)
Prompting (general information, but especially useful for FLUX.2 Klein)
Write prose, not keywords. Structure: Subject -> Setting -> Details -> Lighting -> Atmosphere
A weathered fisherman in his late sixties stands at the bow of a wooden boat,
wearing a salt-stained wool sweater. Golden hour sunlight filters through
morning mist, creating quiet determination and solitude.
Key techniques:
- Front-load critical elements (word order matters)
- Specify lighting: source, quality, direction, temperature
- Include sensory texture: materials, reflections, atmosphere
Good: "A woman with short blonde hair poses against a light neutral background wearing colourful earrings, resting her chin on her hand."
Bad: "woman, blonde, short hair, neutral background, earrings"
Append style tags: Style: Country chic. Mood: Serene, romantic.
Troubleshooting
| Issue | Solution |
|---|---|
| Connection refused | Check InvokeAI is running |
| Model not found | Use --list-models for valid keys |
| Dimensions error | FLUX: multiples of 16, SDXL: 8 |
| Black images (macOS) | Set precision: bfloat16 in invokeai.yaml |
If the script fails to find the URL or authentication token, you can set or ask the user to set environment variables:
export INVOKEAI_API_URL='http://localhost:9090'
export INVOKEAI_AUTH_TOKEN='your-token' # Optional
Resources
scripts/generate.py- Main generation script
FAQ
What does the invokeai-image-gen skill do?
Generate images using InvokeAI's local API. Use when asked to generate, create, or make images with InvokeAI, FLUX.2 Klein, Z-Image Turbo, FLUX, or SDXL models. Supports text-to-image generation, automatic model detection, image download, and parameter selection based on model architecture.
How do I install invokeai-image-gen?
Run npx skills add https://github.com/sammcj/agentic-coding --skill invokeai-image-gen in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/invokeai-image-gen/ (personal) or .claude/skills/invokeai-image-gen/ (project).
Which AI agents can use invokeai-image-gen?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is invokeai-image-gen safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains invokeai-image-gen?
It is published by sammcj in sammcj/agentic-coding. It has 63 recorded installs.
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