Generate Image

What it does

When your agent uses it

• Compositing from reference images
• Tasks that involve Image generation
• Tasks that involve Diagrams

Example prompts

• “/generate-image”

Requirements

• Python 3
• A credential in OPENROUTER_API_KEY
• Compatibility (from SKILL.md): Requires Python 3.9+ and network access to openrouter.ai. The bundled script uses only the standard library. Image generation requires the OPENROUTER_API_KEY credential and bills per request; listing models, inspecting a model, and --dry-run do not. Targets the OpenRouter Image API (POST /api/v1/images) as verified on 2026-07-31.
• Pre-approved tools (allowed-tools): Read, Write, Edit, Bash

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

1. 1api-key
2. 2the OPENROUTER_API_KEY environment variable
3. 3OPENROUTER_API_KEY= in a .env file, searching the working directory upward, then the

What it can do on your machine

Read from SKILL.md and the folder at commit 529b9f7. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Read
  • Write
  • Edit
  • Bash

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships 1 file in scripts/ (Python), which the agent can run.

  Shell commands in SKILL.md call:

  • python
  • curl

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Hosts in commands or code, which the agent is likely to contact:

  • openrouter.ai

  Also links to:

  • arxiv.org
  • doi.org
  • export.arxiv.org

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • OPENROUTER_API_KEY

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Requires Python 3.9+ and network access to openrouter.ai. The bundled script uses only the standard library. Image generation requires the OPENROUTER_API_KEY credential and bills per request; listing models, inspecting a model, and --dry-run do not. Targets the OpenRouter Image API (POST /api/v1/images) as verified on 2026-07-31.

  From compatibility in the SKILL.md frontmatter.

Context cost

Generate Image loads about 3.8k tokens when it runs, and up to ~6.9k if it reads all its reference files. Until then it costs about 95 tokens; SKILL.md has 1,497 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~95

When it runs · the whole SKILL.md, loaded when a task matches

~3.8k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~6.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NoteMentions a .env fileSKILL.md:39

  3. `OPENROUTER_API_KEY=` in a `.env` file, searching the working directory upward, then the

• NoteMentions a .env fileSKILL.md:213

  pi-key` | Overrides the environment and `.env` |

• NoteMentions a .env fileSKILL.md:293

  eep it in the environment or an ignored `.env`.

• NotePre-approves every shell command (allowed-tools: Bash)SKILL.md

  allowed-tools: Read, Write, Edit, Bash

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from K-Dense-AI/claude-scientific-writer at commit 529b9f7, republished under its MIT licence (© K-Dense-AI). 1,497 words, ~3,849 tokens.

name

generate-image

description

Generate or edit images with AI models through the OpenRouter Image API (Gemini, Seedream, Recraft, GPT-Image, Riverflow). Use for photos, illustrations, artwork, concept art, visual assets, logos, and image editing or compositing from reference images. For flowcharts, circuits, pathways, and other technical diagrams, use the scientific-schematics skill instead.

allowed-tools

Read, Write, Edit, Bash

compatibility

Requires Python 3.9+ and network access to openrouter.ai. The bundled script uses only the standard library. Image generation requires the OPENROUTER_API_KEY credential and bills per request; listing models, inspecting a model, and --dry-run do not. Targets the OpenRouter Image API (POST /api/v1/images) as verified on 2026-07-31.

license

MIT

metadata.version

3.1

metadata.skill-author

K-Dense Inc.

metadata.last-reviewed

2026-07-31

# Generate
python scripts/generate_image.py "A beautiful sunset over mountains"

# Edit an existing image
python scripts/generate_image.py "Make the sky purple" -i photo.jpg -o edited.png

python scripts/generate_image.py --list-models            # every model and its allowed values
python scripts/generate_image.py --list-models gemini     # filtered by substring
python scripts/generate_image.py --model-info openai/gpt-image-1   # one model, plus pricing

$ python scripts/generate_image.py "abstract pattern" -m openai/gpt-image-2 --background transparent
Error: Request rejected before billing (1 problem):
  - background=transparent is not allowed; this model accepts: auto, opaque

# Single-image edit
python scripts/generate_image.py "Add sunglasses to the person" -i portrait.png

# Composite several references
python scripts/generate_image.py "Blend these two styles" -i style_a.png -i style_b.jpg -o blend.png

# Reference an image already on the web
python scripts/generate_image.py "Restyle as a watercolor" -i https://example.com/photo.jpg

# Wide hero image for a poster, with space reserved for the title
python scripts/generate_image.py \
  "Laboratory with modern equipment, photorealistic, well-lit, wide shot, \
   equipment on the left, empty wall on the right, no text" \
  --aspect-ratio 21:9 --resolution 2K -o poster/hero.png

# Conceptual illustration for a manuscript — illustrative, never presented as data
python scripts/generate_image.py \
  "Stylised illustration of immune cells surrounding a tumour cell, scientific illustration, \
   cool palette, no text" \
  --resolution 2K -o figures/immunotherapy_concept.png

# Vector logo
python scripts/generate_image.py \
  "Minimal geometric fox logo, two colors" \
  -m recraft/recraft-v4.1-vector -o assets/logo.svg

# Slide background with a transparent alpha channel
python scripts/generate_image.py \
  "Abstract molecular pattern, subtle, blue and white, no text" \
  -m openai/gpt-image-1 --background transparent -o slides/bg.png

# Four variations in one request
python scripts/generate_image.py \
  "Stylized neuron network illustration" \
  -m bytedance-seed/seedream-4.5 --n 4 -o variations.png
# -> variations_1.png ... variations_4.png

# Reproducible output
python scripts/generate_image.py "A cat astronaut" \
  -m bytedance-seed/seedream-4.5 --seed 42

# Check a request costs nothing to get wrong
python scripts/generate_image.py "A cat astronaut" --resolution 4K --dry-run

curl -s https://openrouter.ai/api/v1/images \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/gemini-3.1-flash-image",
    "prompt": "A red bicycle against a white wall",
    "aspect_ratio": "16:9"
  }'

{
  "created": 1748372400,
  "data": [{ "b64_json": "<base64>", "media_type": "image/png" }],
  "usage": {
    "prompt_tokens": 4,
    "completion_tokens": 1120,
    "total_tokens": 1124,
    "cost": 0.0672,
    "completion_tokens_details": { "image_tokens": 1120 }
  }
}

© K-Dense-AI, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (scripts, references) in skills/generate-image of K-Dense-AI/claude-scientific-writer.

• SKILL.md
• references/models.md
• scripts/generate_image.py

Open the folder on GitHubat commit 529b9f7

Used in 2 other repositories

We found 4 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in K-Dense-AI/claude-scientific-writer, which our catalogue first saw on October 7, 2026.

• K-Dense-AI/scientific-agent-skillsskills/generate-image
• lingxling/awesome-skills-cnclaude-scientific-skills/skills/generate-image