### Answer Start with Single Prompt for simple use cases, then switch to Conversation Flow when complexity increases [(1) ]() [(2) ]() . ## When to Use Single Prompt Single Prompt is best for [(2) ]() : - Simple, straightforward conversations - Quick prototypes and testing - Agents with 1-3 functions - Linear conversation flows ## When to Switch to Conversation Flow Move to Conversation Flow when [(1) ]() [(2) ]() : - Your single prompt exceeds 1000 words [(2) ]() - You're using more than 5 functions - You experience behavioral drift (agent deviates from instructions) - You have unreliable tool usage with multiple functions - You need multiple decision branches (more than 3-4 conditional paths) [(1) ]() ## Why Conversation Flow for Complex Tasks Conversation Flow provides [(1) ]() [(3) ]() : - Focused prompts for each conversation phase [(2) ]() - State-specific functions - only relevant tools available in each state - Predictable behavior - each state has a clear, focused purpose - Easier debugging - issues isolated to specific states - Better function control - tools available only when appropriate - Scalable design - add new states without affecting existing ones The str

uctured framework significantly reduces hallucinations by offering predefined pathways for interactions [(3) ]() . **Recommendation**: Start with Single Prompt for simplicity, then migrate to Conversation Flow as your agent's complexity grows [(1) ]() [(2) ]() .

​ To learn more, see the sources I considered: [[1] Prompt Engineering Guide](https://docs.retellai.com/build/prompt-engineering-guide) [[2] Single/Multi Prompt Agent Overview](https://docs.retellai.com/build/single-multi-prompt/prompt-overview) [[3] Retell AI’s Advanced Conversation Flow | Retell AI](https://www.retellai.com/blog/unlocking-complex-interactions-with-retell-ais-conversation-flow) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.