Slack

Arcade's Slack toolkit provides LLM-callable tools for interacting with Slack workspaces on behalf of authenticated users. It covers reading and writing messages, managing conversations, and resolving user identities.

Capabilities

Message reading: Retrieve messages from channels, DMs, and MPIMs with flexible absolute or relative datetime filtering; read full thread reply chains by parent message timestamp.
Message sending: Post top-level messages or thread replies to any channel, DM, or MPIM — resolved by ID, name, or user identity; optionally broadcast thread replies to the main channel.
Conversation discovery & metadata: List all conversations the authenticated user belongs to; fetch metadata (not messages) for any channel, DM, or MPIM by ID, name, or participant identifiers.
User resolution & directory: Look up one or more users by ID, username, or email in a single call; list all workspace members; retrieve the authenticated user's own profile.
Participant management: Invite up to 100 users at once (by ID, username, or email) to public channels, private channels, or MPIMs.

OAuth

This toolkit uses OAuth 2.0 with Slack as the provider. Arcade handles the OAuth flow automatically. See the Slack auth provider docs for configuration details.

	Tool name	Description	Secrets
	Slack.GetConversationMetadata	Get metadata of a Channel, a Direct Message (IM / DM) or a Multi-Person (MPIM) conversation. Use this tool to retrieve metadata about a conversation with a conversation_id, a channel name, or by the user_id(s), username(s), and/or email(s) of the user(s) in the conversation. This tool does not return the messages in a conversation. To get the messages, use the 'Slack.GetMessages' tool instead. Provide exactly one of: - conversation_id; or - channel_name; or - any combination of user_ids, usernames, and/or emails.
	Slack.GetMessages	Get messages in a Slack Channel, DM (direct message) or MPIM (multi-person) conversation. Provide exactly one of: - conversation_id; or - channel_name; or - any combination of user_ids, usernames, and/or emails. To filter messages by an absolute datetime, use 'oldest_datetime' and/or 'latest_datetime'. If only 'oldest_datetime' is provided, it will return messages from the oldest_datetime to the current time. If only 'latest_datetime' is provided, it will return messages since the beginning of the conversation to the latest_datetime. To filter messages by a relative datetime, use 'oldest_relative' and/or 'latest_relative' with numeric `DD:HH:MM` offsets only. Convert relative phrases to `DD:HH:MM` before calling this tool. If only 'oldest_relative' is provided, it will return messages from the oldest_relative to the current time. If only 'latest_relative' is provided, it will return messages from the current time to the latest_relative. Do not provide both 'oldest_datetime' and 'oldest_relative' or both 'latest_datetime' and 'latest_relative'. Leave all arguments with the default None to get messages without date/time filtering
	Slack.GetThreadMessages	Get messages in a Slack thread. A thread is a collection of messages grouped together as replies to a parent message. This tool retrieves all messages in a specific thread, identified by the parent message's timestamp (thread_ts). Provide exactly one of: - conversation_id; or - channel_name; or - any combination of user_ids, usernames, and/or emails. To filter messages by an absolute datetime, use 'oldest_datetime' and/or 'latest_datetime'. If only 'oldest_datetime' is provided, it will return messages from the oldest_datetime to the current time. If only 'latest_datetime' is provided, it will return messages since the beginning of the thread to the latest_datetime. To filter messages by a relative datetime, use 'oldest_relative' and/or 'latest_relative' with numeric `DD:HH:MM` offsets only. Convert relative phrases to `DD:HH:MM` before calling this tool. If only 'oldest_relative' is provided, it will return messages from the oldest_relative to the current time. If only 'latest_relative' is provided, it will return messages from the current time to the latest_relative. Do not provide both 'oldest_datetime' and 'oldest_relative' or both 'latest_datetime' and 'latest_relative'. Leave all datetime arguments with the default None to get all thread messages without date/time filtering.
	Slack.GetUsersInConversation	Get the users in a Slack conversation (Channel, DM/IM, or MPIM) by its ID or by channel name. Provide exactly one of conversation_id or channel_name. Prefer providing a conversation_id, when available, since the performance is better.
	Slack.GetUsersInfo	Get the information of one or more users in Slack by ID, username, and/or email. Provide any combination of user_ids, usernames, and/or emails. If you need to retrieve data about multiple users, DO NOT CALL THE TOOL MULTIPLE TIMES. Instead, call it once with all the user_ids, usernames, and/or emails. If you need to get metadata or messages of a conversation, use the `Slack.GetConversationMetadata` or `Slack.GetMessages` tool instead. These tools accept user_ids, usernames, and/or emails. Do not retrieve users' info first, as it is inefficient.
	Slack.InviteUsersToChannel	Invite users to a Slack channel or MPIM (multi-person direct message). This tool invites specified users to join a Slack conversation. It works with: - Public channels - Private channels - MPIMs (multi-person direct messages / group DMs) You can specify users by their user IDs, usernames, or email addresses. Provide exactly one of channel_id or channel_name, and at least one of user_ids, usernames, or emails. The tool will resolve usernames and emails to user IDs before inviting them. Up to 100 users may be invited at once.
	Slack.ListConversations	List metadata for Slack conversations (channels, DMs, MPIMs) the user is a member of. This tool does not return the messages in a conversation. To get the messages, use the 'Slack.GetMessages' tool instead.
	Slack.ListUsers	List all users in the authenticated user's Slack team. If you need to get metadata or messages of a conversation, use the `Slack.GetConversationMetadata` tool or `Slack.GetMessages` tool instead. These tools accept a user_id, username, and/or email. Do not use this tool to first retrieve user(s), as it is inefficient.
	Slack.SendMessage	Send a message to a Channel, Direct Message (IM/DM), or Multi-Person (MPIM) conversation. Can send top-level messages or reply to an existing thread. Provide exactly one of: - channel_name; or - conversation_id; or - any combination of user_ids, usernames, and/or emails. In case multiple user_ids, usernames, and/or emails are provided, the tool will open a multi-person conversation with the specified people and send the message to it. To reply to a thread, also provide thread_ts (the 'ts' field of the parent message). Optionally set reply_broadcast to true to also post the reply to the main conversation.
	Slack.WhoAmI	Get comprehensive user profile and Slack information. This tool provides detailed information about the authenticated user including their name, email, profile picture, and other important profile details from Slack services.

Capabilities

OAuth

Available tools(10)

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