How do I install the Image Gen skill?

Run npx skillmds@latest add nicknisi/image-gen in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Image Gen safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Image Gen?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Image Gen free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Image Gen?

nicknisi (@nicknisi) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Image Gen by nicknisi — Agent Skill

Name: Image Gen
Author: nicknisi

Image Gen

Generate or edit images via Google Gemini (nano-banana-pro) or OpenAI gpt-image-2. Trigger on "generate image", "create diagram", "edit image", or "make illustration". Supports 1K/2K/4K resolution, masked inpainting, and text-accurate generation.

nicknisi f91b51e 4 files · 1.8 MB Updated Sep 17, 2026

File contents

Image Generation & Editing

Multi-provider image generation. Default provider is Gemini (nano-banana-pro); pass --provider openai to use gpt-image-2.

Which provider to pick

Gemini (default): general illustrations, quick diagrams, visual imagery. Accepts --input-image repeatedly for multi-image composition.
OpenAI: anything where text rendering matters (infographics, slide-like images, dense-label diagrams, logos with text), or when you need masked inpainting on edits.

Usage

The skill ships a pre-bundled Node script — no tsx or dependency install needed. The script's --help is the authoritative flag reference; run it rather than guessing:

node ${CLAUDE_PLUGIN_ROOT}/skills/image-gen/dist/generate_image.js --help

Generate:

node ${CLAUDE_PLUGIN_ROOT}/skills/image-gen/dist/generate_image.js \
  --prompt "your description" --filename "output.png"

Edit (image-to-image):

node ${CLAUDE_PLUGIN_ROOT}/skills/image-gen/dist/generate_image.js \
  --prompt "editing instructions" --filename "output.png" \
  --input-image "path/to/input.png"

API keys

Read from the environment unless --api-key overrides: Gemini uses GEMINI_API_KEY or GOOGLE_API_KEY; OpenAI uses OPENAI_API_KEY. If only OPENAI_API_KEY is set, the provider defaults to OpenAI.

Conventions

Name files YYYY-MM-DD-HH-MM-SS-descriptive-name.png.
For blog diagrams, use OpenAI at 2K — anything with readable labels or callouts needs its text fidelity. Save to the post's content dir (e.g. src/content/blog/post-name/) and prefer clean, minimalist styles.
The script prints the saved path. Report that path to the user; do not read the image back.

---name: image-gendescription: Generate or edit images via Google Gemini (nano-banana-pro) or OpenAI gpt-image-2. Trigger on "generate image", "create diagram", "edit image", or "make illustration". Supports 1K/2K/4K resolution, masked inpainting, and text-accurate generation.---# Image Generation & EditingMulti-provider image generation. Default provider is Gemini (nano-banana-pro); pass `--provider openai` to use gpt-image-2.## Which provider to pick- **Gemini (default):** general illustrations, quick diagrams, visual imagery. Accepts `--input-image` repeatedly for multi-image composition.- **OpenAI:** anything where text rendering matters (infographics, slide-like images, dense-label diagrams, logos with text), or when you need masked inpainting on edits.## UsageThe skill ships a pre-bundled Node script — no tsx or dependency install needed. The script's `--help` is the authoritative flag reference; run it rather than guessing:```bashnode ${CLAUDE_PLUGIN_ROOT}/skills/image-gen/dist/generate_image.js --help```Generate:```bashnode ${CLAUDE_PLUGIN_ROOT}/skills/image-gen/dist/generate_image.js \ --prompt "your description" --filename "output.png"```Edit (image-to-image):```bashnode ${CLAUDE_PLUGIN_ROOT}/skills/image-gen/dist/generate_image.js \ --prompt "editing instructions" --filename "output.png" \ --input-image "path/to/input.png"```## API keysRead from the environment unless `--api-key` overrides: Gemini uses `GEMINI_API_KEY` or `GOOGLE_API_KEY`; OpenAI uses `OPENAI_API_KEY`. If only `OPENAI_API_KEY` is set, the provider defaults to OpenAI.## Conventions- Name files `YYYY-MM-DD-HH-MM-SS-descriptive-name.png`.- For blog diagrams, use OpenAI at `2K` — anything with readable labels or callouts needs its text fidelity. Save to the post's content dir (e.g. `src/content/blog/post-name/`) and prefer clean, minimalist styles.- The script prints the saved path. Report that path to the user; do not read the image back.

Frequently asked questions