# Review Comment

- **Author:** coderabbitai[bot]
- **File:** `packages/providers/fal/avatar-generation/fal_avatar/models/grok.py`
- **Line:** 69
- **Date:** 2026-01-30
- **Comment ID:** 2744842931
- **URL:** https://github.com/donghaozhang/video-agent-skill/pull/14#discussion_r2744842931

---

_⚠️ Potential issue_ | _🟡 Minor_

**Reject whitespace-only prompts.** A prompt like `"   "` currently passes validation and will likely fail downstream.  

<details>
<summary>🛠️ Suggested fix</summary>

```diff
-        if not prompt:
+        if not prompt or not prompt.strip():
             raise ValueError("prompt is required")
@@
-        return {
+        return {
             "video_url": video_url,
-            "prompt": prompt,
+            "prompt": prompt.strip(),
             "resolution": resolution,
         }
```
</details>


Also applies to: 75-78

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 Ruff (0.14.14)</summary>

[warning] 64-64: Avoid specifying long messages outside the exception class

(TRY003)

---

[warning] 66-69: Avoid specifying long messages outside the exception class

(TRY003)

</details>

</details>

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In `@packages/providers/fal/avatar-generation/fal_avatar/models/grok.py` around
lines 62 - 69, The prompt validation currently only checks truthiness and
length, allowing whitespace-only strings like "  "; update the validation in the
Grok model to reject whitespace-only prompts by using prompt.strip() (e.g., if
not prompt or not prompt.strip(): raise ValueError("prompt is required and
cannot be blank/whitespace-only")), then keep the existing max length check;
apply the same fix to the analogous validation block referenced at lines 75-78
so all prompt checks use .strip() to detect blank inputs.
```

</details>

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