← Tools Reference

Slack

Team messaging: post, read, and manage channels

OAuth8 toolshttps://slack.com/api

POST

slack_send_message

Post a message to a channel, private group, or DM

/chat.postMessage

5 parameters

Param	Type	Required	Description
channel	string	required	Channel ID, private group ID, or user ID for a DM (e.g. 'C0123456')
text	string	required	Message text (fallback text if 'blocks' is also given)
thread_ts	string	optional	Timestamp of a parent message, to reply in a thread
blocks	array	optional	Block Kit layout blocks (rich formatting), as an array of block objects
unfurl_links	boolean	optional	Whether to unfurl links in the message

GET

slack_list_channels

List channels, private groups, and DMs the bot can see

/conversations.list

4 parameters

Param	Type	Required	Description
types	string	optional	Comma-separated conversation types to include: public_channel, private_channel, mpim, im (default: public_channel)
exclude_archived	boolean	optional	Exclude archived conversations
limit	integer	optional	Maximum results to return per page (max 1000, default 100)
cursor	string	optional	Pagination cursor from a previous response's response_metadata.next_cursor

GET

slack_get_channel_history

Fetch a conversation's recent messages

/conversations.history

5 parameters

Param	Type	Required	Description
channel	string	required	Conversation ID to fetch history for
limit	integer	optional	Maximum messages to return (default 100, max 999)
oldest	string	optional	Only messages after this Unix timestamp
latest	string	optional	Only messages before this Unix timestamp
cursor	string	optional	Pagination cursor from a previous response's response_metadata.next_cursor

GET

slack_get_channel_info

Get metadata about a single conversation

/conversations.info

2 parameters

Param	Type	Required	Description
channel	string	required	Conversation ID to look up
include_num_members	boolean	optional	Include the member count in the response

POST

slack_create_channel

Create a new public or private channel

/conversations.create

2 parameters

Param	Type	Required	Description
name	string	required	Name for the new channel (lowercase, no spaces, max 80 chars)
is_private	boolean	optional	Create a private channel instead of a public one

GET

slack_list_users

List members of the workspace

/users.list

2 parameters

Param	Type	Required	Description
limit	integer	optional	Maximum results per page (recommended max 200)
cursor	string	optional	Pagination cursor from a previous response's response_metadata.next_cursor

GET

slack_get_user_info

Get profile information for a single user

/users.info

1 parameter

Param	Type	Required	Description
user	string	required	User ID to look up (e.g. 'U0123456')

POST

slack_add_reaction

Add an emoji reaction to a message

/reactions.add

3 parameters

Param	Type	Required	Description
channel	string	required	Channel ID where the message was posted
timestamp	string	required	Timestamp ('ts') of the message to react to
name	string	required	Emoji name without colons (e.g. 'thumbsup')