What is the key difference between Slack MCP Server and Ox MCP?

Slack MCP Server belongs to the Communication category with local stdio execution, while Ox MCP belongs to the Communication category with local stdio execution.

How do I install Slack MCP Server or Ox MCP in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Slack MCP Server and Ox MCP free or paid?

Slack MCP Server operates under a Free / Open Source model (other). Ox MCP operates under a Free / Open Source model (API Key required).

Which MCP server has more tools and community activity?

Slack MCP Server lists 7 tools with 1 views and 1,813 GitHub stars. Ox MCP lists 27 tools with 3 views and 0 GitHub stars.

Can I use both Slack MCP Server and Ox MCP together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Slack MCP Server vs Ox MCP

In-depth architectural comparison of the Slack MCP Server and Ox MCP MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Slack MCP Server

Communication · Local stdio

Quality: 57/100 (Good) | Auth: other

Ox MCP

Communication · Local stdio

Quality: 57/100 (Good) | Auth: API Key required

Verdict Summary: Choose Slack MCP Server if you need specialized Communication tools running via a local process. Choose Ox MCP if your workspace requires Communication integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Slack MCP Server when:

You need dedicated capabilities in the Communication domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: other (Free / Open Source).
You have access to required keys: SLACK_MCP_ADD_MESSAGE_TOOL.
Primary tools included: UserID, UserName, RealName.

Explore Slack MCP Server Details

Choose Ox MCP when:

You need dedicated capabilities in the Communication domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (Free / Open Source).
You have access to required keys: OX_MCP_MAIL_SERVER, OX_MCP_MAIL_USER, OX_MCP_MAIL_APP_PASSWORD, OX_MCP_CALDAV_SERVER, OX_MCP_CALDAV_USER, OX_MCP_CALDAV_APP_PASSWORD.
Primary tools included: .

Feature & Specification Comparison

Specification	Slack MCP Server korotovsky Communication	Ox MCP Rheopyrin Communication
Summary	The most powerful MCP server for Slack Workspaces.	Email (IMAP/SMTP), mail filters (Sieve), calendar (CalDAV), contacts (CardDAV), and free/busy scheduling for Open-Xchange and standards-based mail platforms. Published on the official MCP Registry.
Category & Scope	Communication

Tools & Capabilities Breakdown

Slack MCP Server Tools (7)

UserID

User ID (e.g., `U1234567890`)

UserName

Slack username

RealName

User's real name

DisplayName

User's display name

User's email address

Title

User's job title

DMChannelID

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Slack MCP Server Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "korotovsky-slack-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/inspector"
      ],
      "env": {
        "SLACK_MCP_ADD_MESSAGE_TOOL": "YOUR_SLACK_MCP_ADD_MESSAGE_TOOL_HERE"
      }
    }
  }
}

Ox MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "rheopyrin-ox-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@rheopyrin/ox-mcp"
      ],
      "env": {
        "OX_MCP_MAIL_SERVER": "YOUR_OX_MCP_MAIL_SERVER_HERE",
        "OX_MCP_MAIL_USER": "YOUR_OX_MCP_MAIL_USER_HERE",
        "OX_MCP_MAIL_APP_PASSWORD": "YOUR_OX_MCP_MAIL_APP_PASSWORD_HERE",
        "OX_MCP_CALDAV_SERVER": "YOUR_OX_MCP_CALDAV_SERVER_HERE",
        "OX_MCP_CALDAV_USER": "YOUR_OX_MCP_CALDAV_USER_HERE",
        "OX_MCP_CALDAV_APP_PASSWORD": "YOUR_OX_MCP_CALDAV_APP_PASSWORD_HERE"
      }
    }
  }
}

Frequently Asked Questions

Slack MCP Server is categorized under Communication and uses a local stdio subprocess. In contrast, Ox MCP belongs to Communication using local stdio subprocess. Select Slack MCP Server when you need capabilities focused on communication and Ox MCP when you require tools for communication.

More alternatives to Slack MCP Server More alternatives to Ox MCP Communication category hub