Slack

Connect with Slack workspace to use communication features such as sending messages, managing channels, and viewing user information.

Key Features

• List and search channels
• Send messages and thread replies
• Search messages
• Add emoji reactions
• View channel history
• View user information
• Manage user groups
• View thread replies

Basic Information

Authentication Method

Uses OAuth 2.0 for authentication.

Required Permissions

• channels:history: Read channel history
• chat:write: Write messages
• identify: User identity verification
• reactions:read: Read reactions
• reactions:write: Add reactions
• search:read: Search functionality
• users:read: Read user information
• users.profile:read: Read user profiles
• channels:read: Read channel information
• usergroups:read: Read user groups

Supported MCP Tools

Channel Management Tools

list_channels

Lists public channels in the workspace with pagination.

Input Parameters:

• limit (optional): Number of channels to retrieve at once (default: 100)
• cursor (optional): Pagination cursor
• includeArchived (optional): Whether to include archived channels

search_channels

Searches public channels in the workspace.

Input Parameters:

• query (optional): Channel name keywords to search
• includeArchived (optional): Whether to include archived channels

get_channel_history

Gets recent messages from a channel.

Input Parameters:

• channelId (required): Channel ID
• limit (optional): Number of messages to retrieve

Message Management Tools

post_message

Posts a new message to a Slack channel.

Input Parameters:

• channelId (required): Channel ID to send message to
• text (required): Message content

reply_to_thread

Replies to a specific message thread in Slack.

Input Parameters:

• channelId (required): Channel ID
• threadTs (required): Thread timestamp
• text (required): Reply content

get_thread_replies

Gets all replies in a message thread.

Input Parameters:

• channelId (required): Channel ID
• threadTs (required): Thread timestamp

search_messages

Searches messages across the workspace, filtering by keywords, channels, DMs, senders, and dates.

Input Parameters:

• query (required): Search query
• sort (optional): Sort method (timestamp, score)
• sortDir (optional): Sort direction (asc, desc)
• highlight (optional): Whether to highlight search terms
• count (optional): Number of messages to return
• page (optional): Page number

Reaction Management Tools

add_reaction

Adds an emoji reaction to a message.

Input Parameters:

• channelId (required): Channel ID
• timestamp (required): Message timestamp
• reaction (required): Reaction emoji name

User Management Tools

get_users

Gets a list of all users in the workspace with their basic profile information.

Input Parameters:

• limit (optional): Number of users to retrieve
• cursor (optional): Pagination cursor

get_user_profile

Gets detailed profile information for a specific user.

Input Parameters:

• userId (required): User ID

get_user_groups

Gets a list of all user groups in the workspace.

Input Parameters:

• includeCount (optional): Whether to include group member count
• includeDisabled (optional): Whether to include disabled groups
• includeUsers (optional): Whether to include group member list

get_user_group_users

Gets the list of users in a specific user group.

Input Parameters:

• usergroup (required): User group ID
• includeDisabled (optional): Whether to include disabled users

Usage Example

For example,

• When you input “Send ‘Hello’ message to #general channel in Slack” as a prompt,
• LLM calls the post_message tool via MCP to send the message.
• Then, it responds in the chat based on the tool call results.