A toolkit for creating, editing, and reviewing images through the OpenRouter service. It uses simple scripts and can use reference images and reusable style settings.

Generating new images, editing existing ones, keeping a consistent style across a series, and running an automated visual review.

It gives an agent a defined way to produce image files and check their quality without requiring extra Python packages.

image-gen — Skill for Claude Code and Codex by buildoak

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/buildoak/fieldwork-skills

agentmods

npx agentmods add skills/buildoak/fieldwork-skills/image-gen

Made for: Claude Code, Codex.

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/buildoak/fieldwork-skills/image-gen/github.svg)](https://agentmods.dev/skills/buildoak/fieldwork-skills/image-gen)

Your own site

<a href="https://agentmods.dev/skills/buildoak/fieldwork-skills/image-gen"><img src="https://agentmods.dev/badge/skills/buildoak/fieldwork-skills/image-gen/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/buildoak/fieldwork-skills/image-gen"><img src="https://agentmods.dev/badge/skills/buildoak/fieldwork-skills/image-gen.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 79 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 5,085 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	$0.00079	$0.05085
Opus 5	$0.00039	$0.02542
Sonnet 5	$0.00016	$0.01017
Haiku 4.5	$0.00008	$0.00509

Measured 9d ago against content hash f3484404736b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

image-gen 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 9d ago.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/edit.py, scripts/generate.py, scripts/review.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.

curl -fsSL https://raw.githubusercontent.com/buildoak/fieldwork-skills/main/skills/image-gen/UPDATES.md | head -40

skills/image-gen/SKILL.md · 576 lines

How it starts

The opening of the file, as written. The whole thing — 576 lines — stays where its author put it; the contents beside it link to each section on GitHub.

image-gen

Image generation and editing via OpenRouter. Five models, three scripts, style presets, one JSON contract.

Scripts: ./scripts/generate.py, ./scripts/edit.py, ./scripts/review.py Presets: ./presets/*.json Output dir: ./data/

Setup

export OPENROUTER_API_KEY_IMAGES='your-api-key-here'

Claude Code: copy this skill folder into .claude/skills/image-gen/
Codex CLI: append this SKILL.md content to your project's root AGENTS.md

For the full installation walkthrough (prerequisites, API keys, verification, troubleshooting), see references/installation-guide.md.

Credential management

Three tiers for managing the OPENROUTER_API_KEY_IMAGES environment variable:

Vault skill (recommended): If you have a vault or secret-management skill, store the key there and export it before running scripts. Example: export OPENROUTER_API_KEY_IMAGES=$(vault get OPENROUTER_API_KEY_IMAGES)
Custom secret manager: Use your team's preferred secret manager (1Password CLI, AWS Secrets Manager, etc.)
Plain export: export OPENROUTER_API_KEY_IMAGES='your-api-key-here' in your shell profile

Optional keys for additional features:

OPENAI_API_KEY -- for mask-based inpainting via edit.py --mode openai
ANTHROPIC_API_KEY -- for auto-review via review.py --auto

Model Selection

What do you need?
  |
  +-- Fast + cheap + good enough?
  |     --> nanobanana (~$0.0004/image)
  |
  +-- High quality, no text?
  |     --> flux.2-pro (best visual quality)
  |
  +-- Text in the image?
  |     --> gpt-5-image (best text rendering)
  |
  +-- Image editing?
  |     +-- Describe changes in words --> gpt-5-image or nanobanana-pro
  |     +-- Paint mask area to change --> edit.py --mode openai
  |
  +-- Budget generation at scale?
  |     --> flux.2-klein (fastest, cheapest Flux)
  |
  +-- Quality + editing + reasoning?
        --> nanobanana-pro (best balance)

Read the full file on GitHub · 576 lines

Files

What ships with it

17 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.

9d ago First seen · 576 lines · 79 tokens per session scan A f3484404736b

Subscribe to this mod's changes

image-gen is a skill published in the GitHub repository buildoak/fieldwork-skills (15 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 79 tokens to every session and 5,085 once invoked, about $0.0004 per session on Opus 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 2026-08-30.

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playwright-recording

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youtube-devrel

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demo-pipeline

Record automated demos for mobile and web apps. Converts natural language demo scripts into Maestro flows (mobile) or webreel configs (web), executes them to capture screenshots and video, and generates a QA report. Use when: record demo, demo recording, record app demo, grab demo, automated demo.

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unicli

Comprehensive guide to Uni-CLI — the open Agent-Computer Interface runtime for real software. Trigger when the user needs to fetch data from websites (Twitter, Bilibili, HackerNews, GitHub, Reddit, Bloomberg, Zhihu, WeChat, and hundreds more); interact with news, finance, social, academic, shopping, or video…

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image-gen

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Makes network callslowCapability

How it starts

image-gen

Setup

Credential management

Model Selection

What ships with it

What this file has done since we first saw it

Other skills, from other repositories

webreel

app-store-screenshots

playwright-recording

youtube-devrel

demo-pipeline

unicli