What is the key difference between WorldCitiSim eSIM and Slack Mcp Server?

WorldCitiSim eSIM belongs to the Communication category with local stdio execution, while Slack Mcp Server belongs to the Communication category with local stdio execution.

How do I install WorldCitiSim eSIM or Slack Mcp Server 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 WorldCitiSim eSIM and Slack Mcp Server free or paid?

WorldCitiSim eSIM operates under a Free / Open Source model (No auth required). Slack Mcp Server operates under a Free / Open Source model (other).

Which MCP server has more tools and community activity?

WorldCitiSim eSIM lists 0 tools with 0 views and 0 GitHub stars. Slack Mcp Server lists 7 tools with 1 views and 1,777 GitHub stars.

Can I use both WorldCitiSim eSIM and Slack Mcp Server 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.

How do I install WorldCitiSim eSIM or Slack Mcp Server in Claude Desktop, Cursor, or Windsurf?

Both servers follow the standard Model Context Protocol configuration format. Simply copy the JSON block from the configuration section above and paste it into your AI client's mcpServers configuration object (for instance in claude_desktop_config.json or ~/.cursor/mcp.json ), then completely restart or refresh the application.

Are WorldCitiSim eSIM and Slack Mcp Server free to use, or do they require API keys?

WorldCitiSim eSIM is listed under a Free / Open Source model with No auth required . Slack Mcp Server operates under a Free / Open Source model with other . If environment variables are required (such as API keys), be sure to define them under the env key in your MCP client's configuration file.

Can I run both WorldCitiSim eSIM and Slack Mcp Server at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both worldcitisim-esim and korotovsky-slack-mcp-server as distinct keys inside the single mcpServers object in your configuration file. Your AI assistant will automatically select and call the appropriate tool from either server during chat sessions.

Which MCP server has higher directory engagement and quality ratings?

On AllMCPs, WorldCitiSim eSIM has a Quality Score of 27 /100 ( Emerging ) with 0 views, 0 installs, and 0 GitHub stars. Slack Mcp Server holds a Quality Score of 61 /100 ( Good ) with 1 views, 0 installs, and 1,777 GitHub stars.

Side-by-Side Model Context Protocol Comparison

WorldCitiSim eSIM vs Slack Mcp Server

In-depth architectural comparison of the WorldCitiSim eSIM and Slack Mcp Server 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

WorldCitiSim eSIM

Communication · Local stdio

Quality: 27/100 (Emerging) | Auth: No auth required

Slack Mcp Server

Communication · Local stdio

Quality: 61/100 (Good) | Auth: other

Verdict Summary: Choose WorldCitiSim eSIM if you need specialized Communication tools running via a local process. Choose Slack Mcp Server 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 WorldCitiSim eSIM when:

You need dedicated capabilities in the Communication domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore WorldCitiSim eSIM Details

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

Feature & Specification Comparison

Specification	W WorldCitiSim eSIM Communication	Slack Mcp Server korotovsky Communication
Summary	Travel eSIMs for 193 countries. Stripe + Bitcoin checkout. QR by email in 30s. No API key.	The most powerful MCP server for Slack Workspaces.
Category & Scope	Communication	Communication
Quality signal

Tools & Capabilities Breakdown

WorldCitiSim eSIM Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

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

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).

WorldCitiSim eSIM Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "worldcitisim-esim": {
      "command": "npx",
      "args": [
        "-y",
        "worldcitisim-esim"
      ]
    }
  }
}

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"
      }
    }
  }
}

Frequently Asked Questions

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

More alternatives to WorldCitiSim eSIM More alternatives to Slack Mcp Server Communication category hub Canonical compare URL