Retell AI MCP Server

Instructions

Implementation Reference

• src/index.ts:1225-1226 (handler)

  The handler for the retell_delete_conversation_flow tool. It calls the generic retellRequest helper to perform a DELETE request to the Retell API endpoint /delete-conversation-flow/{conversation_flow_id}.

  case "retell_delete_conversation_flow":
    return retellRequest(`/delete-conversation-flow/${args.conversation_flow_id}`, "DELETE");

• src/index.ts:877-886 (schema)

  The input schema defining the required conversation_flow_id parameter for the tool.

  inputSchema: {
    type: "object",
    properties: {
      conversation_flow_id: {
        type: "string",
        description: "The conversation flow ID to delete"
      }
    },
    required: ["conversation_flow_id"]
  }

• src/index.ts:874-887 (registration)

  The tool registration object added to the tools array, which is used by the MCP server for listing available tools.

  {
    name: "retell_delete_conversation_flow",
    description: "Delete a conversation flow.",
    inputSchema: {
      type: "object",
      properties: {
        conversation_flow_id: {
          type: "string",
          description: "The conversation flow ID to delete"
        }
      },
      required: ["conversation_flow_id"]
    }
  },

• src/index.ts:23-57 (helper)

  Generic helper function that performs authenticated HTTP requests to the Retell API, used by all tool handlers including this one.

  async function retellRequest(
    endpoint: string,
    method: string = "GET",
    body?: Record<string, unknown>
  ): Promise<unknown> {
    const apiKey = getApiKey();
  
    const headers: Record<string, string> = {
      "Authorization": `Bearer ${apiKey}`,
      "Content-Type": "application/json",
    };
  
    const options: RequestInit = {
      method,
      headers,
    };
  
    if (body && method !== "GET") {
      options.body = JSON.stringify(body);
    }
  
    const response = await fetch(`${RETELL_API_BASE}${endpoint}`, options);
  
    if (!response.ok) {
      const errorText = await response.text();
      throw new Error(`Retell API error (${response.status}): ${errorText}`);
    }
  
    // Handle 204 No Content
    if (response.status === 204) {
      return { success: true };
    }
  
    return response.json();
  }