UpdateMessage

Task to update existing Slack messages with support for text content, Block Kit formatting, and link/media previews.

Task version: 2.0.0

Required Frends version: 5.7+

Required .NET version: 8.0

Compatible Agents: Crossplatform

Source code: https://github.com/FrendsPlatform/Frends.Slack/tree/main/Frends.Slack.UpdateMessage

Task Parameters

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: PlainText: Message format mode Blocks: 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" } }]

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

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

Task 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") }

Task Changelog

Changelog for Task Frends.Slack.UpdateMessage.

[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