codex - 💡(How to fix) Fix Built-in image_gen tool should accept explicit parameters: size, quality, output_format, filename/path [2 comments, 2 participants]

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openai/codex#20839Fetched 2026-05-04 05:09:39
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What variant of Codex are you using?

CLI

What feature would you like to see?

The current built-in image_gen tool (enabled via [features] image_generation = true) only accepts a single prompt parameter.

This forces users to cram everything into natural language, which is unreliable for:

  • Exact dimensions
  • Output filename / save path
  • Quality settings
  • Format (PNG with real transparency, WebP, etc.)

Current behavior (CLI / App)

Generate a hero banner, save as assets/hero.png

### Additional information

_No response_

extent analysis

TL;DR

Modify the image_gen tool to accept additional parameters for dimensions, output filename, quality settings, and format.

Guidance

  • Consider adding separate command-line flags or options for each of the desired parameters (e.g., --dimensions, --output, --quality, --format) to improve flexibility and reliability.
  • Evaluate the current implementation of the image_gen tool to determine the best approach for incorporating these new parameters, potentially involving changes to the underlying code or configuration files.
  • Investigate existing libraries or tools that support image generation with customizable parameters to inform the design of the modified image_gen tool.

Example

image_gen --prompt "hero banner" --dimensions 1024x512 --output assets/hero.png --quality 90 --format png

Notes

The exact implementation details will depend on the specific requirements and constraints of the image_gen tool and its underlying technology stack.

Recommendation

Apply workaround: Modify the image_gen tool to accept additional parameters, as this will provide the necessary flexibility and reliability for users.

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codex - 💡(How to fix) Fix Built-in image_gen tool should accept explicit parameters: size, quality, output_format, filename/path [2 comments, 2 participants]