retell_list_calls

Instructions

Implementation Reference

• src/index.ts:1129-1130 (handler)

  Handler case for retell_list_calls tool: Makes a POST request to the Retell API endpoint /v2/list-calls using the provided arguments.

  case "retell_list_calls":
    return retellRequest("/v2/list-calls", "POST", args);

• src/index.ts:128-160 (schema)

  Input schema definition for the retell_list_calls tool, specifying parameters like filter_criteria, limit, pagination_key, and sort_order.

  {
    name: "retell_list_calls",
    description: "List and filter calls with pagination support. Can filter by agent, status, time range, and more.",
    inputSchema: {
      type: "object",
      properties: {
        filter_criteria: {
          type: "object",
          description: "Optional filter criteria",
          properties: {
            agent_id: { type: "array", items: { type: "string" }, description: "Filter by agent IDs" },
            call_type: { type: "array", items: { type: "string" }, description: "Filter by call type (phone_call, web_call)" },
            call_status: { type: "array", items: { type: "string" }, description: "Filter by status (registered, ongoing, ended, error)" },
            start_timestamp_gte: { type: "integer", description: "Filter calls starting after this Unix timestamp" },
            start_timestamp_lte: { type: "integer", description: "Filter calls starting before this Unix timestamp" }
          }
        },
        limit: {
          type: "integer",
          description: "Number of results to return (default: 50, max: 1000)"
        },
        pagination_key: {
          type: "string",
          description: "Pagination key from previous response for fetching next page"
        },
        sort_order: {
          type: "string",
          enum: ["ascending", "descending"],
          description: "Sort order by start timestamp"
        }
      }
    }
  },

• src/index.ts:1283-1285 (registration)

  Registers the list of available tools, including retell_list_calls, via the ListToolsRequestSchema handler.

  server.setRequestHandler(ListToolsRequestSchema, async () => {
    return { tools };
  });

• src/index.ts:1287-1313 (registration)

  Registers the general tool execution handler (CallToolRequestSchema) which dispatches to executeTool based on tool name, handling retell_list_calls.

  // Register tool execution handler
  server.setRequestHandler(CallToolRequestSchema, async (request) => {
    const { name, arguments: args } = request.params;
  
    try {
      const result = await executeTool(name, args as Record<string, unknown>);
      return {
        content: [
          {
            type: "text",
            text: JSON.stringify(result, null, 2),
          },
        ],
      };
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : String(error);
      return {
        content: [
          {
            type: "text",
            text: `Error: ${errorMessage}`,
          },
        ],
        isError: true,
      };
    }
  });

• src/index.ts:23-57 (helper)

  Generic helper function retellRequest used by retell_list_calls handler to make authenticated API calls to Retell AI.

  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();
  }