You are helping me build the following AI agent workflow.

## Goal
Auto Generate And Post AI Videos To YouTube: Submit a video concept and style, then the agent refines the prompt, generates an 8-second clip via Fal.ai Veo3, creates SEO metadata.

## Specification
- What it does: Submit your video concept and style to instantly receive an 8-second AI clip with ready-to-post SEO metadata. The agent handles everything from refining your prompt via Fal.ai Veo3 to automatically uploading the final video to your YouTube channel.
- Trigger: Run manually (Manual · on demand form input)
- Autonomy: Fully hands-off
- Expected setup effort: a few focused days
- Tools/services involved:
  - n8n: Workflow orchestration platform
  - OpenRouter Chat Model: Refining prompts and generating SEO metadata
  - HTTP Request: Sending video generation requests to Fal.ai
  - Google Sheets: Storing request details and fetching prompt templates
  - YouTube: Uploading videos with generated metadata

## Known pitfalls, handle each one explicitly in your implementation
1. YouTube API quotas are strict so add error handling for quota exceeded errors and log failed uploads for manual review instead of crashing the workflow.
2. LLM-generated titles may violate YouTube community guidelines so add a simple keyword filter or safety check before submitting metadata to avoid channel strikes.
3. Aspect ratio mismatches can ruin Shorts performance so validate that the generated video dimensions strictly match 9:16 before uploading.

## Reference implementation
https://n8n.io/workflows/4754 (workflow template)
Fetch and inspect this before building. If it matches my stack, adapt it;
if not, rebuild the pattern with my tools.

## Process requirements
1. Before building: ask me which of the listed tools I actually use and
   what my platform is (n8n / Make / code / other). Do not assume.
2. Adapt the pattern to my answers; do not force the reference stack.
3. Address every pitfall above; tell me how you handled each.
4. Provide a test plan I can run before letting this touch real data.
5. Ask before any step that sends messages, modifies data, or spends money.

Source: https://usecasesforagents.com/use-case/auto-generate-and-post-ai-videos-to-youtube/ via usecasesforagents.com