Interact with Slack channels and messages

Slack guMCP Server

Whether to use user token instead of bot token. Defaults to false for agent requests, true otherwise

End of time range: timestamp in epoch seconds (e.g. 1234567890.123456)

Maximum number of messages to return (default: 20)

Start of time range: timestamp in epoch seconds (e.g. 1234567890.123456)

read_messages

Array of JSON strings containing data of messages with user and message details

Send a message to a Slack channel or user. Supports both plain text and Block Kit UI elements. Either 'text' or 'blocks' parameter must be provided.

Array of Block Kit block objects for rich UI elements. Required if text not provided. Passed directly to Slack API - must be in proper Block Kit format.

Message text to send. Required if blocks not provided. When both text and blocks are provided, text is used as fallback for notifications.

Optional thread timestamp to reply to a thread

Whether to enable link previews (unfurling) for URLs in the message. Defaults to true. Set to false to suppress both text and media link previews.

send_message

JSON string containing response of the message send operation with status, timestamp and message details

Send an ephemeral message to a user in a channel (only visible to that user)

User ID who will receive the ephemeral message

send_ephemeral_message

JSON string containing response of the ephemeral message send operation with status, error and message timestamp

Create a Slack canvas message with rich content

Array of Slack block kit elements as JSON objects

Optional thread timestamp to attach canvas to a thread

create_canvas

Array of JSON string containing response of the canvas creation

Create a standalone Slack canvas document with markdown content

Content of the canvas. Must have "type" (always "markdown") and "markdown" (the content string)

create_standalone_canvas

Array of JSON string containing the canvas creation response

Find sections in a Slack canvas matching criteria like heading type or text content

ID of the canvas to look up sections in (starts with F)

lookup_canvas_sections

Array of JSON string containing matched sections with their IDs

Edit a Slack canvas by inserting, replacing, deleting content or renaming

edit_canvas

Array of JSON string containing the edit result

ID of the canvas to delete (starts with F)

delete_canvas

Array of JSON string containing the deletion result

Set access level to a Slack canvas for specified users or channels

Access level to grant. 'owner' only works with user_ids

List of channel IDs to set access for. Mutually exclusive with user_ids

List of user IDs to set access for. Mutually exclusive with channel_ids

set_canvas_access

Array of JSON string containing the access update result

Remove access to a Slack canvas for specified users or channels

List of channel IDs to remove access for. Mutually exclusive with user_ids

List of user IDs to remove access for. Mutually exclusive with channel_ids

remove_canvas_access

Array of JSON string containing the access removal result

add_user_to_channel

Array of JSON string containing response of adding a user to a channel

delete_message

Array of JSON string containing response of delete operation

Timestamp of the parent message of the thread

get_message_thread

Array of JSON string containing parent message and its replies

pin_message

Array of JSON string containing response of pin operation

unpin_message

Array of JSON string containing response of unpin operation

get_user_presence

Array of JSON string containing user presence information

Search for users across the Slack workspace by email, user ID, or name and get detailed user information

User's email address for exact email lookup

Search by username, real name, display name, first name, or last name (partial matches allowed)

Slack user ID (starts with U) for exact user lookup

search_users

Array containing a single JSON string with Slack API response. For email/user_id search: returns user object under 'user' key. For name search: returns array of users under 'members' key. All responses include 'ok' status field.

remove_from_channel

Array of JSON string containing response of removal operation

list_pinned_items

Array of JSON string containing pinned items in a channel

Create a new public or private Slack channel

Whether the channel should be private (default: false)

Channel name (lowercase, no spaces/periods, max 80 chars)

create_channel

Array of JSON string containing details of the created channel

update_channel_topic

Array of JSON string containing result of the channel topic update

update_channel_purpose

Array of JSON string containing result of the channel purpose update

archive_channel

Array of JSON string containing result of the channel archiving operation

unarchive_channel

Array of JSON string containing result of the channel unarchiving operation

list_users_in_channel

Detailed information about each user in the channel. Each item contains user ID, name, real name, display name, email, admin status, owner status, bot status, last updated timestamp, and presence status.

Retrieve information about a conversation

Whether to include locale information (optional)

Whether to include number of members (optional)

get_conversation_info

Detailed information about the conversation including ID, name, type, topic, purpose, creation date, and other metadata

Find messages, files, channels, and people across your entire Slack workspace. Ask questions naturally (e.g., 'What did Sarah say about Q1 goals?') or search by keywords. Filter by user, channel, date, file type, and more to quickly locate exactly what you need.

Channel types to search in. Options: 'public_channel', 'private_channel', 'mpim', 'im'. Default: all types

Content types to include in search. Options: 'messages', 'files', 'channels', 'users'. Default: ['messages']

Pagination cursor from previous response. Leave blank for first request

Whether to include messages from bots in results (default: false)

Whether to return contextual messages before and after each result (default: false)

Whether to return message content in Block format (default: false)

Number of results to return per page, max 20 (default: 20)

Search query. For semantic search, use natural language questions (e.g., 'What did Sarah say about Q1 goals?'). For keyword search, use keywords (e.g., 'project update'). Supports filters: 'from:<@U12345>', 'in:<#C12345>', 'before:YYYY-MM-DD', 'after:YYYY-MM-DD', 'type:pdf', 'has:link', 'is:saved', etc.

Sort results by 'score' (relevance) or 'timestamp' (chronological). Default: 'score'

Sort direction: 'desc' (descending) or 'asc' (ascending). Default: 'desc'

search

Array of JSON strings, where each string represents a message, file, channel, or user found in the search results. Results are flattened from the API response for easy iteration.

Whether to exclude archived channels (default: true)

Maximum number of channels to return (default: 200, max: 1000)

Comma-separated list of channel types to include. Options: public_channel, private_channel, mpim, im. Default: 'public_channel,private_channel'

list_channels

List of channels with their ID, name, topic, purpose, member count, and other metadata

Upload a file or image to a Slack channel from Gumloop storage, a URL, or base64-encoded content.

Slack channel name or ID to upload the file to

Base64-encoded file content. Provide exactly one of file_name, file_url, or file_content_base64.

Name of the file in Gumloop storage. Provide exactly one of file_name, file_url, or file_content_base64.

URL to download the file from. Provide exactly one of file_name, file_url, or file_content_base64.

Name for the uploaded file (e.g. 'report.pdf', 'screenshot.png')

If true, gets file from workspace storage. Default: false.

Thread timestamp to upload the file as a thread reply

upload_file

JSON string containing the file upload result with status, file_id, and title

Download a file from Slack to Gumloop storage.

Slack file URL. Provide either file_id or file_url.

If true, stores file in workspace storage. Default: false.

download_file

JSON string containing download result with stored filename, original name, file ID, and size

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