Slack MCP Server by korotovsky: Setup for Claude, Cursor and Other Apps

• Searches Slack messages with filters

  Finds messages by words, channel, person or date. It is not available when you connect with a bot token.

  Try: “Find messages from Priya about the launch in the last two weeks.”

  Network · conversations_search_messages

• Reads recent messages in a channel or DM

  Returns the latest messages from one channel or DM and a cursor to page back through older ones.

  Try: “Summarize what happened in #support today.”

  Network · conversations_history

• Reads the replies in a thread

  Returns every reply under one message.

  Try: “Read the thread under the outage announcement.”

  Network · conversations_replies

• Lists channels in the workspace

  Lists channels by type. On large workspaces this can be thousands of results.

  Try: “List the public channels about engineering.”

  Network · channels_list

• Lists only the channels you belong to

  Returns just your own channels, which is shorter on big workspaces.

  Try: “Which channels am I in?”

  Network · channels_me

• Finds people by name, email or ID

  Looks up a person and returns their details and the id of your DM with them if there is one.

  Try: “Find Dana's Slack profile.”

  Network · users_search

• Lists your unread messages, DMs first

  Collects unread messages across channels. With browser tokens it is one complete call; with a user token it scans a limited number of channels and can be partial. Not available with a bot token.

  Try: “What did I miss since this morning?”

  Network · conversations_unreads

• Lists user groups like @engineering

  Shows the mention groups in your workspace and how many people are in each.

  Try: “List all Slack user groups.”

  Network · usergroups_list

• Lists your Save for Later items

  Returns the messages you saved. It works only with the xoxc and xoxd browser session tokens.

  Try: “Show my saved Slack items.”

  Network · saved_list

• Posts a message to a channel or DM

  Posts text as you. Off by default: it needs SLACK_MCP_ADD_MESSAGE_TOOL set, and you can limit it to named channels.

  Try: “Reply in the #ops thread that I'm on it.”

  Write · conversations_add_message

• Adds an emoji reaction to a message

  Reacts to a message as you. Off by default: turn it on with SLACK_MCP_REACTION_TOOL.

  Try: “React with a thumbs up to the last message in #releases.”

  Write · reactions_add

• Removes an emoji reaction

  Takes away a reaction from a message. Off by default: turn it on with SLACK_MCP_REACTION_TOOL.

  Try: “Remove my thumbs up from that message.”

  Write · reactions_remove

• Downloads a file attached to a message

  Returns the content of a Slack file up to 5 MB. Off by default: turn it on with SLACK_MCP_ATTACHMENT_TOOL.

  Try: “Download the CSV attached to the report message.”

  Network · attachment_get_data

• Marks a channel or DM as read

  Clears the unread badge for a conversation. The server accepts the call only when SLACK_MCP_MARK_TOOL is set to true or 1.

  Try: “Mark #random as read.”

  Write · conversations_mark

• Joins a public channel

  Adds you to a public channel.

  Try: “Join #design-reviews.”

  Write · conversations_join

• Leaves a channel or DM

  Removes you from a conversation. It is marked destructive.

  Try: “Leave the #old-project channel.”

  Write · conversations_leave

• Joins or leaves a user group yourself

  Lists your groups, or adds or removes you from one.

  Try: “Add me to the @oncall group.”

  Write · usergroups_me

• Creates a user group

  Makes a new mention group such as @engineering.

  Try: “Create a user group called Design with the handle design.”

  Write · usergroups_create

• Renames or edits a user group

  Changes a group's details but not who is in it.

  Try: “Rename the @eng group to Engineering.”

  Write · usergroups_update

• Replaces everyone in a user group

  Sets the full member list of a group. Anyone you leave out is removed, so the assistant must pass everyone. It is marked destructive.

  Try: “Make the @oncall group just Priya and Sam.”

  Write · usergroups_users_update

• Marks a saved item done or sets a due date

  Changes a Save for Later item.

  Try: “Mark my first saved item as done.”

  Write · saved_update

• Clears all completed Saved items

  Removes every completed item from your Save for Later list at once.

  Try: “Clear my completed saved items.”

  Delete · saved_clear_completed

Watch out for

• Browser session tokens act as your whole account

  The xoxc and xoxd tokens skip app approval but carry everything you can do in Slack. Prefer an xoxp or xoxb token with limited scopes when you can. github.com

• Group and channel changes are on by default

  usergroups_users_update replaces a group's whole member list, and conversations_leave removes you from a channel. Use --enabled-tools to register only the tools you want. github.com

• saved_clear_completed deletes your completed saved items

  It clears every completed item in Save for Later in one call. Leave it out of --enabled-tools if you want to keep them. github.com

• Posting is off until you enable it

  conversations_add_message posts as you. When you set SLACK_MCP_ADD_MESSAGE_TOOL, list channel IDs so it can only post in those channels. github.com

• Your messages go to the AI app

  Anything the assistant reads from Slack is sent to the model provider you use. Avoid connecting a workspace with data your company does not allow in AI tools. github.com

• A local cache holds your user and channel lists

  The server saves them in a cache folder so it starts faster. The path can be changed with SLACK_MCP_USERS_CACHE and SLACK_MCP_CHANNELS_CACHE. github.com

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