MCP/Slack MCP Server (Official)

Slack MCP Server (Official)

Connects AI agents to Slack workspaces to read messages, search conversations, and manage channels through the official Slack API.

developer-tools•Team Collaboration & Workspace Automation

Website

License:MIT

OFFICIAL

@Slack

About this Server

The official Slack Model Context Protocol (MCP) server connects AI agents, assistants, and chatbots directly to Slack workspaces. It enables Large Language Models to read channel histories, retrieve thread conversations, search messages with real-time workspace query intelligence, send and schedule messages, create channels and direct messages, add emoji reactions, manage rich Canvas documents, upload files with signed URLs, query user profiles and channel members, and work with structured Slack Lists and records — all backed by official enterprise Slack authentication and scoped Bot/User tokens without third-party data storage.

Real-time Interaction

Direct low-latency RPC protocol communication with structured JSON schemas.

Scoped Sandboxing

Restricted capability bounds to prevent accidental modifications or leakage.

Security & Best Practices

Scoped OAuth & Bot Tokens: Authenticate via granular Slack bot tokens (channels:history, chat:write, files:write, canvas:write) with least-privilege scoping.

Zero External Data Storage: Direct communication with Slack REST APIs without retaining, caching, or exfiltrating workspace conversation history to third-party databases.

Confirmation for Mutations: Require explicit user approval before sending messages to public channels, archiving channels, or modifying shared canvases.

Workspace Isolation: Enforces multi-tenant isolation through SLACK_TEAM_ID restricting AI access solely to authorized organization channels.

When to Use (and When Not To)

Best For

•Automated engineering workflows such as posting pull request review summaries, CI/CD failure alerts, and deployment announcements
•Searching workspace conversation history, finding past technical decisions, and gathering project context directly from your coding assistant
•Creating and maintaining collaborative documentation with Slack Canvases and tracking deliverables with Slack Lists
•Drafting, reviewing, and scheduling team communications across public or private channels

Not For / Limitations

•Automated mass spamming or unprompted bulk messaging to sensitive general channels without user confirmation
•Workspaces where company compliance policy strictly prohibits AI integration with internal communications
•Replacing high-throughput real-time WebSocket event streams or live audio/video huddle transcription

Install & Setup

One-line terminal command

terminal command

$claude mcp add slack -- npx -y @slack/mcp-server --bot-token $SLACK_BOT_TOKEN --team-id $SLACK_TEAM_ID

Exposed Tools & Endpoints

19 tools

Functions your AI agent can invoke via this Model Context Protocol server

slack_send_message• callable tool

Send messages to any type of conversation in Slack (channels, group DMs, direct messages).

slack_schedule_message• callable tool

Schedule a message to be sent to a conversation at a future time.

slack_draft_message• callable tool

Draft, format, and preview messages directly within AI clients before sending.

slack_read_channel• callable tool

Grab the complete message history and metadata for a specific Slack channel.

slack_read_thread• callable tool

Grab complete message thread conversations and replies for a given parent message.

slack_create_conversation• callable tool

Create a new Slack channel, group DM, or IM conversation on behalf of the user.

slack_add_reaction• callable tool

Add an emoji reaction to a Slack message on behalf of the authenticated user.

slack_get_reactions• callable tool

Retrieve all emoji reactions and reacting user IDs on a specific Slack message.

slack_manage_canvas• callable tool

Create and update rich, formatted Canvas documents and share them in channels.

slack_read_canvas• callable tool

Export and read Slack canvases as formatted Markdown documents.

slack_get_user_info• callable tool

Access complete user profile information, including custom profile fields and active status.

slack_list_channel_members• callable tool

Retrieve a list of user IDs for all members of a given Slack channel or conversation.

slack_get_file_upload_url• callable tool

Acquire a signed upload URL and file ID for uploading files to Slack via a two-step process.

slack_complete_file_upload• callable tool

Finalize an uploaded file by ID and optionally share it into a channel with an accompanying message.

slack_create_list• callable tool

Create structured tabular lists with custom schemas and typed columns (text, date, select, user).

slack_read_list• callable tool

Read Slack list contents, schemas, views, and row records.

slack_update_list• callable tool

Update list metadata, columns, and schema definitions.

slack_update_record• callable tool

Add, update, or delete individual records (rows) inside a Slack list.

slack_search_conversations• callable tool

Search across Slack messages, threads, and workspace conversation content in real time.