How do I connect Slack MCP Server to Claude?

Run `claude mcp add slack-mcp-server -- npx -y @modelcontextprotocol/inspector go run mcp/mcp-server.go --transport stdio` in Claude Code, or add the same command and arguments under mcpServers in Cursor's mcp.json or Claude Desktop's claude_desktop_config.json, then restart the client. The blocks above are ready to paste.

Is Slack MCP Server free?

The listed licence is MIT. Check the upstream terms for permitted use and commercial requirements; a public repository does not by itself mean the software is free or open source. Connected APIs and hosted services may have separate charges.

What can Slack MCP Server do?

Slack MCP Server documents 18 tools to the agent, including channels_list, conversations_add_message, conversations_history. The descriptions above come from project documentation. A live handshake does not test individual tool behavior.

Slack MCP Server

Unclaimed

by korotovsky

The most powerful MCP Slack Server with no permission requirements, Apps support, GovSlack, DMs, Group DMs and smart history fetch logic.

Set up this server

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01 / Choose your client

02 / Before you connect

Authentication is not specified. Check the project instructions before connecting.

Install the runtime required by the project and make it available to your client.

Project instructionsEnvironment variable names (optional)

Use names from the project instructions, separated by commas. Enter names only, never secret values.

03 / Add the configuration

Source: generated from public install instructions

claude mcp add --transport stdio 'slack-mcp-server' -- 'npx' '-y' '@modelcontextprotocol/inspector' 'go' 'run' 'mcp/mcp-server.go' '--transport' 'stdio'

Run in your terminal after replacing any placeholders.

04 / Check it in your client

Open your client’s MCP settings and confirm the server connects and lists its tools. A copied configuration does not confirm a working connection.

assistantsgovslackllmmcpmcp-serverslackslack-api

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18 of 18 tools

Documented tools (18)

From project documentation. A server handshake does not verify each tool’s description or behavior.

channels_list

Get list of channels

conversations_add_message

Add a message to a public channel, private channel, or direct message (DM, or IM) conversation by channelid and threadts.

conversations_history

Get messages from the channel (or DM) by channelid, the last row/column in the response is used as 'cursor' parameter for pagination if not empty

conversations_mark

Mark a channel or DM as read.

conversations_replies

Get a thread of messages posted to a conversation by channelID and threadts, the last row/column in the response is used as cursor parameter for pagination if not empty.

conversations_search_messages

Search messages in a public channel, private channel, or direct message (DM, or IM) conversation using filters. All filters are optional, if not provided then searchquery is required.

conversations_unreads

Get unread messages across all channels efficiently. Uses a single API call to identify channels with unreads, then fetches only those messages. Results are prioritized: DMs > partner channels (Slack Connect) > internal channels.

reactions_add

Add an emoji reaction to a message in a public channel, private channel, or direct message (DM, or IM) conversation.

reactions_remove

Remove an emoji reaction from a message in a public channel, private channel, or direct message (DM, or IM) conversation.

saved_clear_completed

Clear all completed saved items from the "Save for Later" panel. This is a bulk operation that removes all items with state="completed".

saved_list

List saved items from Slack's "Save for Later" panel. Returns items the user has saved, with optional message content. This replaces the deprecated stars.list API (changelog).

saved_update

Update a saved item: mark as completed, set a due date/reminder, or both. Use itemid and ts values from savedlist output. This replaces the deprecated stars.add/stars.remove APIs.

usergroups_create

Create a new user group in the workspace.

usergroups_list

List all user groups (subteams) in the workspace.

usergroups_me

Manage your user group membership: list groups you're in, join a group, or leave a group.

usergroups_update

Update an existing user group's metadata.

usergroups_users_update

Update the members of a user group. This replaces all existing members.

users_search

Search for users by name, email, or display name. Returns user details and DM channel ID if available.

Tool change history

Compared across complete checks of the same configuration. Tools were listed, not invoked. Input-schema changes are not measured here.

No complete tool checks yet.

FAQ

Questions about Slack MCP Server

How do I connect Slack MCP Server to Claude?: Run `claude mcp add slack-mcp-server -- npx -y @modelcontextprotocol/inspector go run mcp/mcp-server.go --transport stdio` in Claude Code, or add the same command and arguments under mcpServers in Cursor's mcp.json or Claude Desktop's claude_desktop_config.json, then restart the client. The blocks above are ready to paste.
Is Slack MCP Server free?: The listed licence is MIT. Check the upstream terms for permitted use and commercial requirements; a public repository does not by itself mean the software is free or open source. Connected APIs and hosted services may have separate charges.
What can Slack MCP Server do?: Slack MCP Server documents 18 tools to the agent, including channels_list, conversations_add_message, conversations_history. The descriptions above come from project documentation. A live handshake does not test individual tool behavior.