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Codex’s Image Generation plugin adds image creation and editing to the agent’s tool surface — useful for icons, UI mockups, marketing assets, and quick visual iterations. Inside Mains you install it from the same Plugins marketplace as Computer Use; on the next Codex run the bundled workflow becomes available automatically.
Like other Codex marketplace plugins, Image Generation ships as a curated bundle (skills and tooling), not as a permanently built-in Codex feature. Browse the marketplace in Mains under Plugins and search for image or Image Generation to install the official OpenAI listing.

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What It Does

Once the plugin is installed, Codex can:
  • Generate new images from a text brief (style, composition, branding constraints)
  • Edit or remix existing assets when you reference files in the workspace or attach images to the conversation
  • Produce simple graphics for READMEs, landing pages, or in-app placeholders
Exact capabilities follow OpenAI’s current image tools bundled with that plugin — they evolve with marketplace updates.

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Installing the Plugin

1

Open Plugins

Click Plugins in the sidebar, stay on the Plugins tab (Codex marketplace).
2

Find Image Generation

Search for image or Image Generation and open the official OpenAI plugin card.
3

Add it

Click Add on the detail page. Mains forwards the install to your Codex account; when it finishes, the plugin shows as installed.
4

Run Codex

Start a Codex workspace run. Mention what you want visually — the agent invokes the plugin’s tools when your task fits.
To remove the plugin later, open its detail page in the marketplace and click Uninstall.

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Using It in a Run

Describe the outcome you want; you can scope the workflow with @ plugin or skill mentions where your Codex surface supports them (Plugins). Example prompts: 
Generate a 1024×1024 app icon for a dark-mode notes app named "Scribble".
Flat vector style, no text in the glyph.

Take assets/logo.png and give me a wide hero banner variant with the same palette and softened gradient background.
Generated outputs show up in Codex responses and your run timeline with other tool activity. Paths on disk follow your Codex install (upstream docs often describe a generated-images location under $CODEX_HOME).