hermes - 💡(How to fix) Fix OpenAI/Codex image generation provider fails with NoneType iterable error [1 pull requests]

Bug Description

The OpenAI/Codex-auth image generation provider is selected and invoked, but image generation fails before returning an image.

The tool reports:

OpenAI image generation via Codex auth failed: 'NoneType' object is not iterable

The tool metadata showed:

provider: openai-codex
model: gpt-image-2-medium
error_type: api_error

This appears to be a provider/tool wrapper failure while handling the Codex-auth response or request config, rather than a prompt/content issue.

Steps to Reproduce

1. Configure Hermes image generation to use the OpenAI/Codex-auth image provider.
2. Call the image generation tool with a normal prompt and aspect_ratio: landscape.
3. Observe the provider failure.
4. Retry with a shorter prompt; the same error occurs.

Expected Behavior

The provider should either:

• successfully return an image URL/file, or
• return a structured, actionable error from the upstream provider/auth layer.

Actual Behavior

The image generation call fails with:

OpenAI image generation via Codex auth failed: 'NoneType' object is not iterable

No image is returned.

Notes

• The same environment previously had another image backend working, so the failure seems specific to the OpenAI/Codex-auth provider path.
• A long prompt and a shorter prompt both produced the same error.
• No secrets, tokens, or account-specific values are included here.

Suggested Investigation

• Check whether the Codex-auth image provider assumes an iterable field that may be None in the auth/session/client response.
• Add defensive handling and a clearer error message around the upstream response parsing.
• Add a smoke test for gpt-image-2-medium via Codex auth with a minimal prompt.