graph TD A[Document Compiler Subagent Start] --> B[Input Validation] B --> C{All Required Inputs Present?} C -->|No| D[Error: Missing Input] D --> Z[End Process] C -->|Yes| E[Initialize LLM Skill #223] E --> F[Format VSL Segments] F --> G[Match Visual Prompts to Segments] G --> H[Insert Transitions Between Segments] H --> I[Add Music/SFX Section] I --> J[Generate Final Document Structure] J --> K[Create VideoAdCreativeBrief.txt] K --> L{Document Creation Successful?} L -->|No| M[Error: Document Creation Failed] M --> Z L -->|Yes| N[Return video-ad-creative-brief] N --> Z