What is gemini-imagegen?

A skill for creating and editing images through Google’s Gemini image-generation API, a service that turns text instructions or existing images into new images. It supports image creation, editing, style changes, logos with text, stickers, and product mockups.

Use it to generate images from prompts, edit existing images, apply visual styles, create text-bearing logos or stickers, and make product mockups.

It provides documented scripts and API examples for image work without requiring you to design the integration from scratch.

gemini-imagegen — Skill for Claude Code by unclecode/claude-code-tools

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add unclecode/claude-code-tools --skill gemini-imagegen

Clone the repo

git clone --depth 1 https://github.com/unclecode/claude-code-tools

Made for: Claude Code.

Or install unclecode-cc-toolkit, the plugin that ships this one along with the rest of its 2 skills, 15 commands.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/unclecode/claude-code-tools/gemini-imagegen/github.svg)](https://agentmods.dev/skills/unclecode/claude-code-tools/gemini-imagegen)

Your own site

<a href="https://agentmods.dev/skills/unclecode/claude-code-tools/gemini-imagegen"><img src="https://agentmods.dev/badge/skills/unclecode/claude-code-tools/gemini-imagegen/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/unclecode/claude-code-tools/gemini-imagegen"><img src="https://agentmods.dev/badge/skills/unclecode/claude-code-tools/gemini-imagegen.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,435 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00075	$0.01435
Opus 5.5	$0.00030	$0.00574
Sonnet 5.5	$0.00015	$0.00287
Haiku 4.5	$0.00007	$0.00144

Measured 1mo ago against content hash d19969a7b436, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gemini-imagegen scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

The scan reads SKILL.md. This mod also ships 5 executable files (scripts/compose_images.py, scripts/edit_image.py, scripts/gemini_images.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

## REST API (curl)

plugins/unclecode-cc-toolkit/skills/gemini-imagegen/SKILL.md · 191 lines

How it starts

The opening of the file, as written. The whole thing — 191 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Gemini Image Generation (Nano Banana)

Generate and edit images using Google's Gemini API. The environment variable GEMINI_API_KEY must be set.

Available Models

Model	Alias	Resolution	Best For
`gemini-2.5-flash-image`	Nano Banana	1024px	Speed, high-volume tasks
`gemini-3-pro-image-preview`	Nano Banana Pro	Up to 4K	Professional assets, complex instructions, text rendering

Quick Start Scripts

Text-to-Image

python scripts/generate_image.py "A cat wearing a wizard hat" output.png

Edit Existing Image

python scripts/edit_image.py input.png "Add a rainbow in the background" output.png

Multi-Turn Chat (Iterative Refinement)

python scripts/multi_turn_chat.py

Core API Pattern

All image generation uses the generateContent endpoint with responseModalities: ["TEXT", "IMAGE"]:

import os
import base64
from google import genai

client = genai.Client(api_key=os.environ["GEMINI_API_KEY"])

response = client.models.generate_content(
    model="gemini-2.5-flash-image",
    contents=["Your prompt here"],
)

for part in response.parts:
    if part.text:
        print(part.text)
    elif part.inline_data:
        image = part.as_image()
        image.save("output.png")

Image Configuration Options

Control output with image_config:

from google.genai import types

response = client.models.generate_content(
    model="gemini-3-pro-image-preview",
    contents=[prompt],
    config=types.GenerateContentConfig(
        response_modalities=['TEXT', 'IMAGE'],
        image_config=types.ImageConfig(
            aspect_ratio="16:9",  # 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9
            image_size="2K"       # 1K, 2K, 4K (Pro only for 4K)
        ),
    )
)

Editing Images

Pass existing images with text prompts:

from PIL import Image

img = Image.open("input.png")
response = client.models.generate_content(
    model="gemini-2.5-flash-image",
    contents=["Add a sunset to this scene", img],
)

Read the full file on GitHub · 191 lines

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 191 lines · 75 tokens per session scan A d19969a7b436

Subscribe to this mod's changes

gemini-imagegen is a skill published in the GitHub repository unclecode/claude-code-tools (4 stars, last pushed 10mo ago), licensed MIT. It adds 75 tokens to every session and 1,435 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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