xsantcastx MCP Server

An MCP (Model Context Protocol) server that exposes xsantcastx.com developer tools for AI agents. All tools run server-side with zero external API calls — pure Node.js computation.

Tools Available

| Tool | Description | |------|-------------| | json_format | Format, minify, validate, or analyze JSON | | json_schema_generate | Generate JSON Schema from sample data (Draft 4/7/2020-12) | | uuid_generate | Generate UUIDs v4 (bulk, multiple formats) | | uuid_validate | Validate and inspect UUID strings | | base64_encode | Encode text to Base64 (standard or URL-safe) | | base64_decode | Decode Base64 to text | | jwt_decode | Decode JWT tokens (header, payload, expiration) | | regex_test | Test regex patterns with match details and groups | | regex_replace | Find and replace using regex | | hash_generate | Generate hashes (MD5, SHA-1, SHA-256, SHA-384, SHA-512) | | hash_verify | Verify a string matches a hash (auto-detects algorithm) | | color_contrast | WCAG 2.1 contrast ratio checker with AA/AAA compliance | | cron_parse | Parse cron expressions with human-readable descriptions | | cron_build | Build cron expressions from options or presets |

Quick Start

Install from npm

npm install -g xsantcastx-mcp-server

Use with Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "xsantcastx-tools": {
      "command": "npx",
      "args": ["xsantcastx-mcp-server"]
    }
  }
}

Use with Claude Code

claude mcp add xsantcastx-tools npx xsantcastx-mcp-server

Run locally

git clone https://github.com/xsantcastx/xsantcastx-mcp-server.git
cd xsantcastx-mcp-server
npm install
npm run build
npm start

Development

npm run dev    # Watch mode
npm run build  # Compile TypeScript
npm start      # Run server

Architecture

The server uses the official @modelcontextprotocol/sdk and communicates over stdio. Each tool is implemented as a pure function in src/tools/ — no external API calls, no network requests, no secrets. Everything runs locally.

src/
├── index.ts              # MCP server entry point + tool registrations
└── tools/
    ├── json-formatter.ts # JSON format/minify/validate
    ├── json-schema.ts    # JSON Schema generation
    ├── uuid-generator.ts # UUID v4 generation + validation
    ├── base64.ts         # Base64 encode/decode
    ├── jwt-decoder.ts    # JWT token inspection
    ├── regex-tester.ts   # Regex testing + replacement
    ├── hash-generator.ts # Cryptographic hashing
    ├── color-contrast.ts # WCAG contrast checking
    └── cron-parser.ts    # Cron expression parsing

Listing

• Apify: apify.com/xsantcastx/xsantcastx-mcp (pending)
• MCP Market: mcpmarket.com (pending)
• Web: xsantcastx.com

License

MIT — xsantcastx