# UpdateMessage Required Frends version: 5.7+ Required .NET version: 8.0 Compatible Agents: Unknown Source code: {% tabs %} {% tab title="Parameter: Input" %} | Name | Description | | -------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | ChannelId : `String` |

Channel ID where the message exists


Default: -
Example: C12345678

| | MessageTs : `String` |

Timestamp of the message to update


Default: -
Example: 1234567890.123456

| | Mode : `MessageMode` |

Message format mode

Possible values:

Message format mode

Message format mode


Default: -
Example: PlainText

| | Text : `String` |

The plain text content (when Mode = PlainText)


Default: -
Example: Updated message text

| | Blocks : `String` |

Block Kit JSON (when Mode = Blocks)


Default: -
Example: \[{ "type": "section", "text": { "type": "mrkdwn", "text": "Updated content" } }]

| | {% endtab %} | | {% tab title="Parameter: Connection" %} | Name | Description | | ------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | 🗝Token : `String` |

Slack OAuth token used for authentication.

If the token is a bot token (starts with "xoxb"), messages

will be updated as the Slack app's bot user.

If the token is a user token (starts with "xoxp"), messages

will be updated as the Slack user who authorized the token.

The token owner must be the original message poster

or have appropriate permissions to edit the message.

Note: User tokens require the user to have authorized the app via OAuth

with appropriate scopes (e.g., "chat:write").


Default: -
Example: xoxb-123456789

| | {% endtab %} | | {% tab title="Parameter: Options" %} | Name | Description | | -------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | UnfurlLinks : `Boolean` |

Whether to expand URLs in the message into rich previews (e.g. YouTube, websites).

Note: Slack may unfurl a link only once per channel to reduce duplication.


Default: True
Example: true

| | UnfurlMedia : `Boolean` |

Whether to show media previews (e.g. images, video thumbnails) for links in the message.

Note: Media previews may appear only on first post of the same link.


Default: True
Example: true

| | ThrowErrorOnFailure : `Boolean` |

True: Throw an exception.

False: Error will be added to the Result.Error.AdditionalInfo list instead of stopping the Task.


Default: True
Example: true

| | ErrorMessageOnFailure : `String` |

Message what will be used when error occurs.


Default: Failed to update message
Example: Task failed during execution

| | {% endtab %} | | {% tab title="Result: Result" %} | Name | Description | | -------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | Success : `Boolean` |

Indicates whether the message was updated successfully.
Example: true

| | MessageTs : `String` |

The timestamp (ID) of the updated message.
Example: 1234567890.123456

| | Error : `Error` |

Error that occurred during task execution.
Example: { Message = "Failed to update Slack message.", AdditionalInfo = new Exception("Slack API returned 400 Bad Request") }

| | {% endtab %} | | {% tab title="Changelog" %} ## Changelog ### \[2.0.0] - 2026-03-04 #### Fixed * Blocks JSON string is now correctly parsed to JArray before sending to Slack API. * \[Breaking change] - Input.Blocks type changed from JArray to string. Users should now provide raw JSON string instead of parsed JArray. ### \[1.0.0] - 2025-06-09 #### Added * Initial implementation {% endtab %} {% endtabs %}