npm package

xsantcastx MCP Server

14 developer tools for your AI agents

Works with Claude Desktop, Claude Code, and any MCP-compatible client. Zero API calls. All local computation.

View on npm GitHub

Install

npm install -g xsantcastx-mcp-server

Use with Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "xsantcastx": {
      "command": "xsantcastx-mcp-server"
    }
  }
}

Use with Claude Code

Run this command in your terminal:

claude mcp add xsantcastx-mcp-server -- xsantcastx-mcp-server

14 Built-in Tools

Every tool runs locally — no network, no latency, no keys required.

json_format

Pretty-print or minify JSON.

json_format({ json: '{"a":1}', indent: 2 })

json_schema_generate

Infer a JSON Schema from a sample object.

json_schema_generate({ sample: '{"id":1,"name":"Alice"}' })

uuid_generate

Generate a v4 UUID.

uuid_generate({ count: 5 })

uuid_validate

Validate a UUID string.

uuid_validate({ uuid: "..." })

base64_encode

Encode text to Base64.

base64_encode({ text: "hello" })

base64_decode

Decode Base64 to text.

base64_decode({ encoded: "aGVsbG8=" })

jwt_decode

Decode a JWT (no verification).

jwt_decode({ token: "eyJ..." })

regex_test

Test a string against a regex pattern.

regex_test({ pattern: "\\d+", input: "abc123" })

regex_replace

Replace matches in a string using regex.

regex_replace({ pattern: "foo", replacement: "bar", input: "foo baz" })

hash_generate

Generate a hash (MD5/SHA-1/SHA-256/SHA-512).

hash_generate({ text: "hello", algorithm: "sha256" })

hash_verify

Verify text against a known hash.

hash_verify({ text: "hello", hash: "...", algorithm: "sha256" })

color_contrast

Calculate WCAG color contrast ratio.

color_contrast({ foreground: "#fff", background: "#0a0f1e" })

cron_parse

Parse a cron expression into human-readable form.

cron_parse({ expression: "0 9 * * 1-5" })

cron_build

Build a cron expression from schedule params.

cron_build({ minute: "0", hour: "9", weekday: "1-5" })

Why xsantcastx MCP Server?

Zero API Calls

Runs entirely on your machine. No network requests, no latency.

No Secrets Required

No API keys, no environment variables, no auth.

Pure Node.js

Lightweight, fast, zero native dependencies.

MIT Licensed

Open source. Use it, fork it, extend it.

npm

xsantcastx-mcp-server

GitHub

xsantcastx/xsantcastx-mcp-server