content: package com.google.a2a.model;
  
  import com.fasterxml.jackson.annotation.JsonInclude;
  import com.fasterxml.jackson.annotation.JsonProperty;
  import java.util.Map;
  
  /**
   * TaskSendParams represents the parameters for sending a task message
   */
  @JsonInclude(JsonInclude.Include.NON_NULL)
  public record TaskSendParams(
      /**
       * ID is the unique identifier for the task being initiated or continued
       */
      @JsonProperty("id") String id,
      
      /**
       * SessionID is an optional identifier for the session this task belongs to
       */
      @JsonProperty("sessionId") String sessionId,
      
      /**
       * Message is the message content to send to the agent for processing
       */
      @JsonProperty("message") Message message,
      
      /**
       * PushNotification is optional push notification information for receiving notifications
       */
      @JsonProperty("pushNotification") PushNotificationConfig pushNotification,
      
      /**
       * HistoryLength is an optional parameter to specify how much message history to include
       */
      @JsonProperty("historyLength") Integer historyLength,
      
      /**
       * Metadata is optional metadata associated with sending this message
       */
      @JsonProperty("metadata") Map<String, Object> metadata
  ) {
  } 