MCP servers · communication
Slack MCP server
Team messaging — channels, messages, threads, users, files, reactions, bookmarks, reminders, canvases, search, scheduled messages, pins. Hosted by 0n3: 45 endpoints your AI can call with your own Slack account, from Claude, ChatGPT, Cursor, Claude Code, Codex or Gemini CLI. One sign-in, one key per AI, a receipt for every call.
45 endpoints12 categoriesauth: bot_tokenhosted
What your AI can do with Slack
Send message · Post, update, delete, and schedule messages7
Send a message
POST /chat.postMessageUpdate a message
POST /chat.updateDelete a message
POST /chat.deleteSchedule a message
POST /chat.scheduleMessagePin message
POST /pins.addUnpin message
POST /pins.removeSearch messages
GET /search.messagesChannels · Full channel lifecycle management13
List channels
GET /conversations.listCreate a channel
POST /conversations.createArchive a channel
POST /conversations.archiveUnarchive channel
POST /conversations.unarchiveRename channel
POST /conversations.renameSet a channel topic
POST /conversations.setTopicSet a channel purpose
POST /conversations.setPurposeInvite a to channel
POST /conversations.inviteKick from channel
POST /conversations.kickChannel history
GET /conversations.historyChannel info
GET /conversations.infoJoin channel
POST /conversations.joinLeave channel
POST /conversations.leaveThreads · Thread replies and conversation management2
Reply a to thread
POST /chat.postMessageGet thread replies
GET /conversations.repliesUsers · List users, get profiles, set status4
List users
GET /users.listGet an user
GET /users.infoGet an user profile
GET /users.profile.getSet an user status
POST /users.profile.setFiles · Upload, list, delete, and share files5
Upload a file
POST /files.uploadList files
GET /files.listDelete a file
POST /files.deleteShare file
POST /files.sharedPublicURLSearch files
GET /search.filesReactions · Emoji reactions on messages3
Add a reaction
POST /reactions.addRemove a reaction
POST /reactions.removeList reactions
GET /reactions.getPins · Pin and unpin messages in channels1
List pins
GET /pins.listBookmarks · Channel bookmarks3
Add a bookmark
POST /bookmarks.addRemove a bookmark
POST /bookmarks.removeList bookmarks
GET /bookmarks.listReminders · Set and manage reminders3
Add a reminder
POST /reminders.addList reminders
GET /reminders.listDelete a reminder
POST /reminders.deleteCanvases · Create and edit Slack canvases2
Create canvas
POST /canvases.createUpdate canvas
POST /canvases.editSearch · Search across messages, files, and users0
Search across messages, files, and users
More · Everything else this app exposes.2
Get a permalink
GET /chat.getPermalinkGet a team info
GET /team.infoInstall in three steps
- Create a free account at 0n3.app and connect Slack: paste a key or sign in through a door. It lands in your vault, encrypted.
- Open 0n3.app/install, pick your AI. A key is made for that AI alone; copy the line it gives you.
- Ask your AI: whoami. It answers with your connected services. Then ask it to send a message in Slack.
Install (user scope — every project)
claude mcp add --transport http --scope user 0n3 https://0n3.app/mcp --header "Authorization: Bearer <your 0n token>"
Connect Slack to
Claude Code + SlackMCP server + skillClaude (desktop & claude.ai) + SlackconnectorChatGPT + Slackconnector · GPT actionCodex CLI + SlackMCP serverGemini CLI + SlackMCP serverCursor + SlackMCP serverVS Code (Copilot) + SlackMCP serverWindsurf + SlackMCP server
More communication MCP servers
Questions
What can an AI do with the Slack MCP server?
45 things: send message, channels, threads, users and more. Every call runs with your own Slack connection and lands on a receipt.
Do I need to run anything on my computer?
No. 0n3 is hosted. Connect Slack once, install 0n3 into your AI with one line, done.
Where does my Slack key go?
Into your 0n3 vault, encrypted, one record per connection. The AI never sees it.