Slack MCP server

This MCP server extension enhances the Slack MCP Server by adding custom functionality that allows Claude to interact with Slack workspaces more effectively. It builds upon the original server while introducing additional tools for improved message searching and workspace interaction.

Installation

To set up the Slack MCP Server extension, follow the setup instructions from the original Slack MCP Server documentation at https://github.com/modelcontextprotocol/servers/tree/main/src/slack.

Available Tools

slack_search_messages

This tool allows you to search for messages across Slack channels with the option to exclude direct messages from search results.

Required Parameters:

• query (string): The search query to find relevant messages

Optional Parameters:

• count (number): The number of search results to return (default: 5)

Configuration Options:

• excludeDMsFromSearch (boolean): When set to true, the tool automatically excludes direct messages from search results by adding -in:@ to your query (default: false)

Usage Examples

Basic Message Search

To perform a basic search for messages containing specific keywords:

{
  "query": "project deadline",
  "count": 3
}

Excluding Direct Messages from Search Results

If you want to search only in public and private channels but not direct messages:

{
  "query": "quarterly report",
  "count": 5,
  "excludeDMsFromSearch": true
}

Advanced Search Queries

You can use Slack's search operators in your query for more targeted results:

{
  "query": "from:@username has:reaction after:2023-01-01",
  "count": 10
}

Additional Functionality

For all other available tools and functionality, refer to the original Slack MCP Server documentation at https://github.com/modelcontextprotocol/servers/tree/main/src/slack.

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "slack" '{"command":"npx","args":["-y","mcp-servers-slack-extension"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "slack": {
            "command": "npx",
            "args": [
                "-y",
                "mcp-servers-slack-extension"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "slack": {
            "command": "npx",
            "args": [
                "-y",
                "mcp-servers-slack-extension"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect