### Answer The Conversation Flow API exists and allows you to programmatically define conversational flows using the Retell SDK or REST endpoints. [(1) ]() However, the Retell MCP server (when used with tools like Claude) is designed for invoking already configured agents, not for designing or updating conversation flow details from within an assistant UI. [(2) ]() In other words: - **Yes**: You can create conversation flow agents programmatically via the Retell SDK/API [(1) ]() - **No**: You cannot create or design conversation flows directly through Claude's MCP tool interface—MCP is for calling existing agents, not building new flows [(2) ]() If you need to create conversation flows, use the Retell SDK directly:

javascript
import Retell from 'retell-sdk';
const client = new Retell({
  apiKey: 'YOUR_RETELL_API_KEY',
}) ;
const conversationFlowResponse = await client.conversationFlow.create({
  model_choice: { model: 'gpt-4.1', type: 'cascading' },
  nodes: [
    {
      id: 'start',
      instruction: { text: 'Greet the customer and ask how you can help them.', type: 'prompt' },
      type: 'conversation',
    },
  ],
  start_speaker: 'agent',
}) ;

[(1) ]()

​ To learn more, see the sources I considered: [[1] Create Conversation Flow](https://docs.retellai.com/api-references/create-conversation-flow) [[2] Retell MCP Server: Conversational Flow API](https://discord.com/channels/1186424376300679209/1400361046895493283) ​

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