hermes - 💡(How to fix) Fix hermes-codex-bug-report

Bug Description

The image_gen/openai-codex plugin fails to generate images because the Codex Responses API (chatgpt.com/backend-api/codex/responses) strips custom tools and doesn't support the tool_choice parameter properly.

Steps to Reproduce

1. Enable plugin: hermes plugins enable image_gen/openai-codex
2. Auth: hermes auth add --type oauth openai-codex
3. Call image generation
4. Error: Tool choice 'image_generation' not found in 'tools' parameter.

Root Cause

The Codex API at https://chatgpt.com/backend-api/codex/responses strips the tools array from all incoming requests. The API response in response.created always shows "tools": [] regardless of what's sent.

The plugin's tool_choice={"type": "allowed_tools", "mode": "required", "tools": [{"type": "image_generation"}]} fails because the API doesn't propagate custom tools.

Attempted Fixes That Also Failed

• tool_choice="required" → "Tool choice 'required' must be specified with 'tools' parameter"
• tool_choice={"type": "function", "function": {"name": "image_generation"}} → "Unknown parameter: 'tool_choice.function'"
• No tool_choice → Model returns text only, never invokes image_generation tool

Environment

• macOS 15.7.5
• Hermes Agent v0.14.0 (2026.5.16)
• openai SDK 2.24.0
• Python 3.12.13

Notes

• Device code auth to auth.openai.com returns "unsupported_country_region_territory" (region blocked in China)
• Token exchange via auth.openai.com/oauth/token works fine
• The non-codex image_gen/openai plugin works correctly with standard OPENAI_API_KEY
• image_gen/xai plugin also works fine with XAI_API_KEY