Use OpenAI Imagegen safely

OpenAI Imagegen is an official skill from the public openai/skills repository, located under skills/.system/imagegen. A skill in this sense is not a standalone application but a structured instruction file in SKILL.md format that tells an AI coding assistant such as Codex or Claude Code when and how to generate or edit images. According to the provider, the skill activates whenever a project benefits from AI-generated raster visuals, for example website assets, game assets, UI mockups, product mockups, wireframes, logo design, photorealistic images, or infographics. It is explicitly not meant for purely vector-based or code-native graphics, such as SVG icons that are maintained directly within an existing icon system.

Two operating modes

According to the provider, the skill defines exactly two modes. The preferred default mode uses the coding agent's built-in image generation tool and requires no separate OpenAI API key, since costs are covered through the user's existing subscription. The second mode, explicitly activated only on an explicit user request, calls a bundled command-line script that offers subcommands for generating, editing, and batch-processing images. This CLI fallback requires its own API key and, per the instructions, is never switched to automatically in place of the default mode, even if the built-in path fails; instead the assistant is supposed to inform the user first and ask for explicit consent.

Requirements

Using the skill requires an environment that supports the Agent Skills format, such as Codex or compatible Claude tools, where skills are stored as local directories containing a SKILL.md file. The default mode needs no separate programming key, since it relies on the agent's built-in tool. Only someone who explicitly wants to use the CLI fallback needs to set an environment variable containing a valid OpenAI API key.

Installation and file locations

The skill can be downloaded through common skill installers from the openai/skills repository, for example via a command-line call that installs only the imagegen skill specifically. After downloading, the SKILL.md file typically lives in the local skills directory of the project or user profile. According to the instructions, the bundled image-generation script should not be modified on one's own; if something is missing, the assistant is supposed to ask first rather than improvise its own solution.

Security, storage locations, and limits

In the default mode, according to the provider, the coding agent first stores generated images in its own internal directory rather than automatically in the system's temp folder. Images actually meant for use in the project must then be deliberately moved or copied into the workspace; pure preview or brainstorming images, on the other hand, can remain at their original location. Existing files are not overwritten without being asked; instead, per the guidance, a new filename with a version suffix is assigned. Anyone using the CLI fallback should keep in mind that image prompts and any uploaded reference images are transmitted to OpenAI once an API key is in use.

Practical benefit

In practice, the skill is well suited to quickly producing visual placeholders, concept images, or finished assets right inside the development workflow, without switching context or opening a separate image tool. The clear split between default and fallback modes ensures that extra costs or programming keys only come into play when actually wanted. The limit is reached where existing vector graphics or icon systems need ongoing maintenance, since the skill, by its own description, is not intended for that.