Generate Image

What it does

When your agent uses it

• Asked to generate
• Tasks that involve Image generation

Example prompts

• “/generate-image”

Requirements

• A credential in SKILL_IMAGE_GEN_OPENAI_KEY
• A credential in SKILL_IMAGE_GEN_GEMINI_KEY

Workflow steps

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

1. 1Check for API keys — check whether SKILL_IMAGE_GEN_OPENAI_KEY and/or SKILL_IMAGE_GEN_GEMINI_KEY are set in the environment.
2. 2If one key is set — use that provider. No need to ask.
3. 3If both are set — pick based on context (OpenAI for polish, Gemini for speed), or ask if the user has a preference.
4. 4If no keys are set — run the Onboarding section.
5. 5Generate the image using the appropriate API reference.
6. 6Tell the user where the image was saved.

What it can do on your machine

Read from SKILL.md and the folder at commit 727ff2e. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are json).

  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:

  • api.openai.com
  • generativelanguage.googleapis.com

  Also links to:

  • platform.openai.com
  • aistudio.google.com

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

• Credentials

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

  • SKILL_IMAGE_GEN_OPENAI_KEY
  • SKILL_IMAGE_GEN_GEMINI_KEY

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

Context cost

Generate Image loads about 958 tokens when it runs. Until then it costs about 66 tokens; SKILL.md has 371 words of instructions outside code blocks.

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

~66

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

~958

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

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); files beside SKILL.md are not scanned.

SKILL.md

The full file from github/awesome-copilot at commit 727ff2e, republished under its MIT licence (© github). 371 words, ~958 tokens.

name

generate-image

description

Generate images using AI. Use when asked to generate, create, or make images, textures, icons, sprites, artwork, visual assets, or mockups. Supports OpenAI (gpt-image-2) and Google Gemini (Nano Banana). Requires an API key for the chosen provider.

argument-hint

[description of the image to generate]

license

MIT

metadata.version

2.1.0

metadata.providers

openai, gemini

{
  "model": "gpt-image-2",
  "prompt": "<user prompt>",
  "n": 1,
  "size": "1024x1024",
  "quality": "medium"
}

{
  "contents": [{"parts": [{"text": "Generate an image: <user prompt>"}]}],
  "generationConfig": {"responseModalities": ["TEXT", "IMAGE"]}
}

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

Files

Just SKILL.md in skills/generate-image of github/awesome-copilot.

Open the folder on GitHubat commit 727ff2e