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codex-imagegen

codex-imagegen is a skill for Codex from giulioco/skills. It costs 213 tokens per session (1,552 once invoked), scanned A, original, Apache-2.0.

A skill for creating and editing bitmap images through Codex's built-in image-generation tool. Bitmap images include photos, illustrations, mockups, textures, and other pixel-based graphics.

In plain words
What is it for?
Use it to generate images, edit existing visuals, and create assets such as product shots, logos, UI graphics, or illustrations.
Why use it?
It provides a way to make or change visual assets from prompts without needing an OpenAI API key.

Skill for Codex

Written for Codex: reads $CODEX_HOME. Also seen: mentions Claude Code; reads ~/.codex paths; runs codex exec.

not rated 11repo 3mo ago A scan 213 tokens original Apache-2.0

Good fit Use it to generate images, edit existing visuals, and create assets such as product shots, logos, UI graphics, or illustrations.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/giulioco/skills/codex-imagegen
View source ↗ giulioco/skills
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 giulioco/skills --skill codex-imagegen
Clone the repo
git clone --depth 1 https://github.com/giulioco/skills

Made for: 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.

agentmods badge for codex-imagegen

README.md
[![agentmods](https://agentmods.dev/badge/skills/giulioco/skills/codex-imagegen/github.svg)](https://agentmods.dev/skills/giulioco/skills/codex-imagegen)
Your own site
<a href="https://agentmods.dev/skills/giulioco/skills/codex-imagegen"><img src="https://agentmods.dev/badge/skills/giulioco/skills/codex-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.

agentmods 80×15 button for codex-imagegen

Your own site · 80×15
<a href="https://agentmods.dev/skills/giulioco/skills/codex-imagegen"><img src="https://agentmods.dev/badge/skills/giulioco/skills/codex-imagegen.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 213 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,552 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00213 $0.01552
Opus 5.5 $0.00085 $0.00621
Sonnet 5.5 $0.00043 $0.00310
Haiku 4.5 $0.00021 $0.00155

Measured 1mo ago against content hash c8c3b1c121fc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

codex-imagegen scanned grade A with 0 findings 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 1 executable file (scripts/codex_imagegen.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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/codex-imagegen/SKILL.md · 93 lines

How it starts

The opening of the file, as written. The whole thing — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.

codex-imagegen

Generate and edit bitmap images from Claude Code by driving Codex's built-in image_gen tool through a one-shot codex exec run.

Why this works (the mechanism)

Codex ships a $imagegen skill with two modes:

  1. Built-in image_gen tool (this skill uses it) — runs against Codex's own backend using the user's ChatGPT/Codex login (~/.codex/auth.json). No OPENAI_API_KEY required, no per-image API billing. It's the default Codex mode.
  2. CLI fallback (scripts/image_gen.py) — hits the OpenAI Image API directly, needs OPENAI_API_KEY. This skill does not use it.

The built-in tool is internal to Codex's agent runtime — there is no codex image subcommand. But a headless codex exec "<prompt>" run can invoke it. The wrapper script builds a tightly-scoped prompt that forces Codex to use only the built-in tool, runs codex exec, then locates the PNG Codex just wrote under $CODEX_HOME/generated_images/ and copies it into the working directory with a clean filename.

Source it wraps: ~/.codex/skills/.system/imagegen/ (Codex's installed skill).

Prerequisites

  • codex CLI on PATH and logged in (codex login). Verify: codex login status or just run a generation — the wrapper reports a clear error if Codex isn't authed.
  • No API key needed. The wrapper explicitly tells Codex not to use the API/CLI fallback.

Usage

The wrapper lives at scripts/codex_imagegen.py (resolve its absolute path relative to this SKILL.md).

Generate

python3 scripts/codex_imagegen.py generate \
  --prompt "a minimal hero image of a ceramic coffee mug, soft studio lighting, lots of negative space" \
  --out ./hero.png
  • --out accepts a file (./hero.png), a directory (./images/ → auto-named from the prompt), or is omitted (lands in cwd, named from a slug of the prompt).
  • -n 3 generates 3 distinct images (one built-in call each). With -n>1 and a file --out, outputs are suffixed -1, -2, -3.
  • Existing files are never overwritten unless --force; otherwise a -v2 sibling is written.

Read the full file on GitHub · 93 lines

Files

What ships with it

1 file 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.

  1. 1mo ago First seen · 93 lines · 213 tokens per session scan A c8c3b1c121fc

Subscribe to this mod's changes

codex-imagegen is a skill published in the GitHub repository giulioco/skills (11 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 213 tokens to every session and 1,552 once invoked, about $0.0009 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Creative and media
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