Add Comment task.commentitem.add

If you are developing integrations for Bitrix24 using AI tools (Codex, Claude Code, Cursor), connect to the MCP server so that the assistant can utilize the official REST documentation.

Scope: task

Who can execute the method: any user with read access permission for the task or higher

The method task.commentitem.add adds a new comment to a task.

DEPRECATED

The development of this method has been halted since version tasks 25.700.0. Please use tasks.task.chat.message.send.

Method Parameters

Required parameters are marked with *

Name
type

Description

TASKID*
integer

Task identifier.

The task identifier can be obtained when creating a new task or by using the get task list method

FIELDS*
object

Object with comment fields

FIELDS Parameter

Required parameters are marked with *

Name `type`	Description
POST_MESSAGE* `string`	Message text
AUTHOR_ID `integer`	Identifier of the user on behalf of whom the comment should be created. You can obtain the user identifier using the user.get method. The method `task.commentitem.add` allows any user to add a comment on behalf of someone else.
POST_DATE `string`	Message date
UF_FORUM_MESSAGE_DOC `array`	Array of file identifiers from Drive. Prefix each identifier with `n`, for example, `['n123', 'n456', ... ]`. The comment author must have access to the attached files; otherwise, the method will return an error

Code Examples

How to Use Examples in Documentation

cURL (Webhook)

cURL (OAuth)

PHP

BX24.js

PHP CRest

curl -X POST \
        -H "Content-Type: application/json" \
        -H "Accept: application/json" \
        -d '{"TASKID":8017,"FIELDS":{"POST_MESSAGE":"Text of the new comment for the task","AUTHOR_ID":503,"POST_DATE":"2025-07-15T14:30:00+02:00","UF_FORUM_MESSAGE_DOC":["n4755","n4753"]}}' \
        https://**put_your_bitrix24_address**/rest/**put_your_user_id_here**/**put_your_webhook_here**/task.commentitem.add

curl -X POST \
        -H "Content-Type: application/json" \
        -H "Accept: application/json" \
        -d '{"TASKID":8017,"FIELDS":{"POST_MESSAGE":"Text of the new comment for the task","AUTHOR_ID":503,"POST_DATE":"2025-07-15T14:30:00+02:00","UF_FORUM_MESSAGE_DOC":["n4755","n4753"]},"auth":"**put_access_token_here**"}' \
        https://**put_your_bitrix24_address**/rest/task.commentitem.add

try
        {
        	const response = await $b24.callMethod(
        		'task.commentitem.add',
        		{
        			"TASKID": 8017,
        			"FIELDS": {
        				"POST_MESSAGE": "Text of the new comment for the task",
        				"AUTHOR_ID": 503,
        				"POST_DATE": "2025-07-15T14:30:00+02:00",
        				"UF_FORUM_MESSAGE_DOC": ["n4755", "n4753"]
        			}
        		}
        	);
        	
        	const result = response.getData().result;
        	console.info(result);
        	console.log(result);
        }
        catch( error )
        {
        	console.error('Error:', error);
        }

try {
            $response = $b24Service
                ->core
                ->call(
                    'task.commentitem.add',
                    [
                        'TASKID' => 8017,
                        'FIELDS' => [
                            'POST_MESSAGE'         => 'Text of the new comment for the task',
                            'AUTHOR_ID'            => 503,
                            'POST_DATE'            => '2025-07-15T14:30:00+02:00',
                            'UF_FORUM_MESSAGE_DOC' => ['n4755', 'n4753'],
                        ],
                    ]
                );
        
            $result = $response
                ->getResponseData()
                ->getResult();
        
            echo 'Success: ' . print_r($result, true);
            // Your data processing logic here
            processData($result);
        
        } catch (Throwable $e) {
            error_log($e->getMessage());
            echo 'Error adding task comment: ' . $e->getMessage();
        }

BX24.callMethod(
            'task.commentitem.add',
            {
                "TASKID": 8017,
                "FIELDS": {
                    "POST_MESSAGE": "Text of the new comment for the task",
                    "AUTHOR_ID": 503,
                    "POST_DATE": "2025-07-15T14:30:00+02:00",
                    "UF_FORUM_MESSAGE_DOC": ["n4755", "n4753"]
                }
            },
            function(result){
                console.info(result.data());
                console.log(result);
            }
        );

require_once('crest.php');
        
        $result = CRest::call(
            'task.commentitem.add',
            [
                'TASKID' => 8017,
                'FIELDS' => [
                    'POST_MESSAGE' => 'Text of the new comment for the task',
                    'AUTHOR_ID' => 503,
                    'POST_DATE' => '2025-07-15T14:30:00+02:00',
                    'UF_FORUM_MESSAGE_DOC' => ['n4755', 'n4753']
                ]
            ]
        );
        
        echo '<PRE>';
        print_r($result);
        echo '</PRE>';

Response Handling

HTTP Status: 200

{
            "result": 3141,
            "time": {
                "start": 1753262861.683775,
                "finish": 1753262862.001611,
                "duration": 0.31783604621887207,
                "processing": 0.27428317070007324,
                "date_start": "2025-07-23T12:27:41+02:00",
                "date_finish": "2025-07-23T12:27:42+02:00",
                "operating_reset_at": 1753263461,
                "operating": 0.2742629051208496
            }
        }

Returned Data

Name `type`	Description
result `integer`	Identifier of the new comment
time `time`	Information about the request execution time

Error Handling

HTTP Status: 400

{
            "error":"ERROR_CODE",
            "error_description":"Insufficient permissions to add a comment.<br>"
        }

Name `type`	Description
error `string`	String error code. It may consist of digits, Latin letters, and underscores
error_description `error_description`	Textual description of the error. The description is not intended to be shown to the end user in its raw form

Possible Error Codes

Code	Description	Value
`ERROR_CORE`	Comment text not specified	Required parameter `POST_MESSAGE` not provided or is empty
`ERROR_CORE`	Insufficient permissions to add a comment	No access permission to the task
`ERROR_CORE`	File not found	File from parameter `UF_FORUM_MESSAGE_DOC` not found or the author does not have access to it
`ERROR_CORE`	TASKS_ERROR_EXCEPTION_#256; Param #1 (arFields) for method ctaskcommentitem::add() must not contain key `<FIELD_NAME>`.; 256/TE/WRONG_ARGUMENTS	Field `<FIELD_NAME>` cannot be used in the method
`ERROR_CORE`	TASKS_ERROR_EXCEPTION_#256; Param #0 (taskId) for method ctaskcommentitem::add() expected to be of type "integer", but given something else.; 256/TE/WRONG_ARGUMENTS	Incorrect value type specified for the parameter, e.g., for `TASKID`

Statuses and System Error Codes

HTTP Status: 20x, 40x, 50x

The errors described below may occur when calling any method.

Status	Code Error Message	Description
`500`	`INTERNAL_SERVER_ERROR` Internal server error	An internal server error has occurred. Please contact the server administrator or Bitrix24 technical support
`500`	`ERROR_UNEXPECTED_ANSWER` Server returned an unexpected response	An internal server error has occurred. Please contact the server administrator or Bitrix24 technical support
`503`	`QUERY_LIMIT_EXCEEDED` Too many requests	The request intensity limit has been exceeded
`405`	`ERROR_BATCH_METHOD_NOT_ALLOWED` Method is not allowed for batch usage	The current method is not permitted for calls using batch
`400`	`ERROR_BATCH_LENGTH_EXCEEDED` Max batch length exceeded	The maximum length of parameters passed to the batch method has been exceeded
`401`	`NO_AUTH_FOUND` Wrong authorization data	Invalid access token or webhook code
`400`	`INVALID_REQUEST` Https required	The HTTPS protocol is required for method calls
`503`	`OVERLOAD_LIMIT` REST API is blocked due to overload	The REST API is blocked due to overload. This is a manual individual block; please contact Bitrix24 technical support to lift it
`403`	`ACCESS_DENIED` REST API is available only on commercial plans	The REST API is only available on commercial plans
`403`	`INVALID_CREDENTIALS` Invalid request credentials	The user associated with the access token or webhook used to call the method lacks the necessary permissions
`404`	`ERROR_MANIFEST_IS_NOT_AVAILABLE` Manifest is not available	The manifest is not available
`403`	`insufficient_scope` The request requires higher privileges than provided by the webhook token	The request requires higher privileges than those provided by the webhook token
`401`	`expired_token` The access token provided has expired	The provided access token has expired
`403`	`user_access_error` The user does not have access to the application	The user does not have access to the application. This means that the application is installed, but the portal administrator has restricted access to this application to specific users only
`500`	`PORTAL_DELETED` Portal was deleted	The public part of the site is closed. To open the public part of the site on an on-premise installation, disable the "Temporary closure of the public part of the site" option. Path to the setting: Desktop > Settings > Product Settings > Module Settings > Main Module > Temporary closure of the public part of the site

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Overview of methods

Update comment

Add Comment task.commentitem.add

Method ParametersMethod Parameters

FIELDS ParameterFIELDS Parameter

Code ExamplesCode Examples

Response HandlingResponse Handling

Returned DataReturned Data

Error HandlingError Handling

Possible Error CodesPossible Error Codes

Statuses and System Error CodesStatuses and System Error Codes

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