Default video-model `veo-3.1-fast-generate-001` returns 404 — should be `veo-3.1-fast-generate-preview`

[renebirkholz-JARVIS]

Bug Description

When running video generation via the Claude Code plugin (or npx @the-focus-ai/nano-banana --video) without explicitly setting --video-model, the plugin defaults to veo-3.1-fast-generate-001. This model name returns HTTP 404 from the Gemini API:

Error generating video: ApiError: {"error":{"code":404,"message":"models/veo-3.1-fast-generate-001 is not found for API version v1beta, or is not supported for predictLongRunning. Call ModelService.ListModels to see the list of available models and their supported methods.","status":"NOT_FOUND"}}

The correct, currently-available preview model name is veo-3.1-fast-generate-preview (with -preview suffix, not -001).

Repro Steps

1. Install the plugin in Claude Code:

   /plugin marketplace add https://github.com/The-Focus-AI/claude-marketplace.git
   /plugin install nano-banana@focus-marketplace
   

2. Set `GEMINI_API_KEY` env var with a valid Gemini API key (billing-enabled project recommended).
3. Run a video generation without explicit `--video-model`:
   ```bash
   npx @the-focus-ai/nano-banana --video "A sunset over mountains" --output /tmp/test.mp4
   ```
4. Observe 404 error from Gemini API.

Expected Behavior

The plugin should either:

• (a) Default to a working model name (`veo-3.1-fast-generate-preview`), or
• (b) Auto-resolve the latest `-preview` suffix dynamically via the `/v1beta/models` listing endpoint.

Workaround

Explicitly set `--video-model veo-3.1-fast-generate-preview` on every video call:

```bash
npx @the-focus-ai/nano-banana --video "..." --video-model veo-3.1-fast-generate-preview --output ...
```

Verified working as of 2026-05-19.

Environment

• Plugin version: `1.0.9` (auto-installed via npx)
• Claude Code: latest stable (as of May 2026)
• Node.js: v25.8.0
• OS: macOS 14.x
• Gemini API: `v1beta`

Reference

The `--list-models` command correctly lists the working model:

```
Video Generation (Veo):
veo-2.0-generate-001
veo-3.0-fast-generate-001
veo-3.0-generate-001
veo-3.1-fast-generate-preview ← works
veo-3.1-generate-preview
veo-3.1-lite-generate-preview
```

The `*-fast-generate-001` naming pattern only exists for Veo 2 and Veo 3 (non-3.1) — Veo 3.1 has switched to a `-preview` suffix during the preview phase.

Related

This is similar to the deprecation pattern Google applied to `gemini-3-pro-preview` (discontinued 2026-03-26, replaced by `gemini-3.1-pro-preview`). Plugin defaults should track upstream renames more closely or use the dynamic model-listing approach.

Thanks for the plugin — works great once the model-name workaround is in place!