hermes - 💡(How to fix) Fix [Feature]: Add custom model entry option to in-session /model picker [1 pull requests]

Problem or Use Case

Summary

The interactive in-session /model picker does not allow entering a custom model name. It only allows selecting from the curated/listed models.

This is inconsistent with hermes model, which has an “Enter custom model name” option, and it makes session-only custom model switching harder than necessary.

Current Behavior

Inside an active Hermes CLI session:

1. Run /model
2. Select a provider
3. The picker only shows the listed models, Back, and Cancel
4. There is no way to type an arbitrary model name from the picker

To use a custom model name, I have to either:

/model <custom-model> --provider <provider>

or run:

hermes model

But hermes model updates the default/global config, while I often only want to switch the current session.

Expected Behavior

The in-session /model picker should include:

Enter custom model name

After selecting it, the user should be able to type any model ID/slug, press Enter, and have Hermes switch the current session only, unless --global.

Related Issues

Possibly related, but not exact duplicates:

• #11677: custom provider picker only shows default model
• #10011: auto-discover models from custom provider endpoints in /model picker
• #8470: /model <provider>/<model> syntax with custom providers

Proposed Solution

Add an Enter custom model name option to the prompt_toolkit /model picker model-selection stage.

When selected:

• switch the picker into a typed-entry state
• read the entered model name from the input buffer
• call the existing switch_model(...) path with the selected provider
• preserve existing session-only behavior by default
• only persist globally if /model --global opened the picker

Alternatives Considered

No response

Feature Type

Gateway / messaging improvement

Scope

Small (single file, < 50 lines)

Contribution

• I'd like to implement this myself and submit a PR

Debug Report (optional)