Slack

Connect Slack to send messages, search channels, and react to new messages or reactions from your workflows.

Triggers

New Message in Channel

Fires when a new message is posted in a specific channel.

Output	Type	Description
messageTs	string	Message timestamp (unique message ID)
text	string	Message text
user	string	Slack user ID of the sender
channelId	string	Channel ID
threadTs	string	Thread timestamp if the message is a reply
type	string	Message type

New Message by Search

Fires when a new message matching a search query appears in any channel you have access to.

Output	Type	Description
messageTs	string	Message timestamp
text	string	Message text
user	string	Sender's user ID
channelId	string	Channel where the message appeared

New Message in Conversation

Fires when a new direct message or conversation message arrives.

Output	Type	Description
messageTs	string	Message timestamp
text	string	Message text
user	string	Sender's user ID
channelId	string	Conversation ID

New Reaction in Channel

Fires when a reaction emoji is added to a message in a monitored channel.

Output	Type	Description
reaction	string	The emoji name (without colons)
user	string	User who added the reaction
messageTs	string	Timestamp of the reacted-to message
channelId	string	Channel ID

Actions

Send Message

Posts a message to a channel or conversation.

Input	Required	Description
Channel ID	Yes	The channel or conversation ID to post to
Text	Yes	The message text (supports Slack mrkdwn formatting)

Output	Type	Description
messageTs	string	Timestamp of the posted message
channelId	string	Channel the message was posted to

Reply to Message

Posts a reply in a thread.

Input	Required	Description
Channel ID	Yes	Channel containing the original message
Thread Timestamp	Yes	The messageTs of the message to reply to
Text	Yes	Reply text

Search Messages

Searches messages across channels you have access to.

Input	Required	Description
Query	Yes	Search query

Output	Type	Description
messages	array	Matching messages with text, user, channelId, ts

Get Channels

Returns a list of channels in the workspace.

Output	Type	Description
channels	array	Channel objects with id, name, isPrivate

Get People

Returns workspace members.

Output	Type	Description
users	array	User objects with id, name, email, displayName

Search User by Email

Finds a Slack user by their email address.

Input	Required	Description
Email	Yes	Email address to look up

Output	Type	Description
user	object	User object with id, name, email

Get Conversation History

Retrieves recent messages from a channel or conversation.

Input	Required	Description
Channel ID	Yes	Channel or conversation ID
Limit	No	Number of messages to retrieve

Output	Type	Description
messages	array	Message objects