MCP Slack

Test Slack authentication and get info about the token owner. Returns the authenticated user's ID, team ID, team name, username, and workspace URL. Use this to verify the connection is working.

List channels in the Slack workspace. Args: types: Comma-separated channel types: public_channel, private_channel, mpim, im exclude_archived: Exclude archived channels (default: true) limit: Max results per page, 1-1000 (default: 200) cursor: Pagination cursor from previous response Returns: List of channels with pagination metadata

Get detailed information about a Slack channel. Args: channel_id: Channel ID (starts with C, D, or G) Returns: Channel details including name, topic, purpose, member count

Get message history from a Slack channel. Args: channel_id: Channel ID (starts with C, D, or G) limit: Max messages to return, 1-1000 (default: 100) cursor: Pagination cursor from previous response oldest: Only messages after this timestamp (e.g., 1234567890.123456) latest: Only messages before this timestamp inclusive: Include messages at oldest/latest boundary Returns: List of messages with pagination metadata

Get replies in a Slack message thread. Args: channel_id: Channel ID (starts with C, D, or G) thread_ts: Timestamp of the parent message limit: Max replies to return, 1-1000 (default: 100) cursor: Pagination cursor from previous response oldest: Only replies after this timestamp latest: Only replies before this timestamp inclusive: Include messages at oldest/latest boundary Returns: List of thread messages with pagination metadata

List members of a Slack channel. Args: channel_id: Channel ID (starts with C, D, or G) limit: Max members to return, 1-1000 (default: 200) cursor: Pagination cursor from previous response Returns: List of member user IDs with pagination metadata

Search messages in the Slack workspace. Supports Slack search modifiers: from:user, in:channel, has:link, before:date, after:date, during:month. Args: query: Search query string sort: Sort by "timestamp" or "score" (default: timestamp) sort_dir: Sort direction "asc" or "desc" (default: desc) count: Results per page, 1-100 (default: 20) page: Page number (default: 1) Returns: Matching messages with total count and pagination info

Get reactions for a specific Slack message. Args: channel_id: Channel ID (starts with C, D, or G) timestamp: Message timestamp (e.g., 1234567890.123456) full: If true, return complete reaction list for each emoji Returns: Message with its reactions

List reactions made by a user. Args: user_id: User ID to list reactions for (default: authenticated user) count: Results per page, 1-100 (default: 100) page: Page number (default: 1) full: If true, return complete reaction list Returns: Reaction items with pagination info

List starred items for the authenticated user. Args: count: Results per page, 1-100 (default: 100) page: Page number (default: 1) cursor: Pagination cursor from previous response Returns: Starred items with pagination info

Get information about a Slack user. Args: user_id: User ID (starts with U, W, or B) Returns: User details including name, email, status, timezone

List users in the Slack workspace. Args: limit: Max users to return, 1-1000 (default: 200) cursor: Pagination cursor from previous response Returns: List of workspace members with pagination metadata

Get a Slack user's profile information. Args: user_id: User ID (starts with U, W, or B) include_labels: Include custom profile field labels Returns: User profile with display name, status, image URLs, custom fields

List files in the Slack workspace (metadata only, no content download). Args: channel_id: Filter by channel ID user_id: Filter by uploader's user ID types: Filter by types (comma-separated: spaces, snippets, images, gdocs, zips, pdfs, all) count: Results per page, 1-100 (default: 100) page: Page number (default: 1) ts_from: Filter files created after this Unix timestamp ts_to: Filter files created before this Unix timestamp Returns: File metadata list with pagination info

Get metadata about a Slack file (no content download). Args: file_id: File ID (starts with F) count: Number of comments per page (default: 100) page: Page of comments (default: 1) Returns: File metadata, comments, and pagination info

Send or schedule a Slack message. When SLACK_ADD_MESSAGE_DELAY is set (default: 3m), the message is scheduled via chat.scheduleMessage, giving a cancellation window before delivery. Use slack_cancel_scheduled_message with the returned scheduled_message_id to cancel. Set SLACK_ADD_MESSAGE_DELAY=0 to post immediately. Args: channel_id: Channel ID (starts with C, D, or G) text: Message text (Markdown supported) thread_ts: Parent message timestamp to reply in-thread Returns: scheduled_message_id + post_at (if scheduled) or ts (if immediate)

Cancel a scheduled Slack message before it sends. Args: channel_id: Channel ID the message was scheduled in scheduled_message_id: The scheduled_message_id returned by slack_send_message Returns: Confirmation with scheduled_message_id