text-rot13-converter

Converts a given text input into its ROT13 encoded form, replacing each letter with the letter 13 positions ahead in the alphabet. This is a utility MCP (Model Context Protocol) server providing a simple text-encoding tool.

Installation

You can use this MCP server via npx (recommended) or install globally:

Run without install:

npx @dennisk2025/text-rot13-converter

Install globally:

npm install -g @dennisk2025/text-rot13-converter

Once installed, you can run:

text-rot13-converter

Adding to Claude Desktop

To use this MCP server in Claude Desktop, add the following to your configuration file:

{
  "mcpServers": {
    "rot13": {
      "command": "npx",
      "args": ["@dennisk2025/text-rot13-converter"]
    }
  }
}

Add this to your Claude Desktop config file at:

• ~/Library/Application Support/Claude/claude_desktop_config.json (macOS)
• %APPDATA%\Claude\claude_desktop_config.json (Windows)

Usage

After configuring, you can call the tool encode_rot13 from within Claude Desktop or any other MCP-compatible client.

Available Tools

1. encode_rot13

• Description: Takes a string and returns its ROT13 encoded version.
• Input Parameters:
  • text (string) — The input text to encode with ROT13. (required)

Example Tool Call

Tool: encode_rot13

Input:

{
  "text": "Hello, World!"
}

Output:

{
  "result": "Uryyb, Jbeyq!"
}

Example MCP Tool Call (JSON)

{
  "name": "encode_rot13",
  "arguments": {
    "text": "Secret message."
  }
}

Response:

{
  "result": "Frperg zrffntr."
}

Summary of Tools

| Tool Name | Description | Parameters | | -------------- | ------------------------------------------- | -------------------------- | | encode_rot13 | Returns the ROT13 encoded version of a text | text (string, required) |