Availability Server

A small Model Context Protocol (MCP) server written in TypeScript. It exposes two tools that an MCP-capable client (such as Claude Desktop or Claude Code) can discover and call:

• check_availability — returns available appointment slots for a given date.
• format_call_summary — turns a caller, intent and next action into a tidy SMS-style summary.

The server communicates over stdio, the transport MCP clients use to launch and talk to a local server process. The tool logic is self-contained so the server runs anywhere with no API keys or external services.

Why this exists

I build production AI systems that use tool-calling and orchestration (a conversational agent on the Anthropic API, and a phone voice agent on Telnyx). This repo is a clean, minimal example of authoring an MCP server: defining tools with typed input schemas, returning structured content, and serving them over the MCP stdio transport.

Requirements

• Node.js 18 or later

Install and build

npm install
npm run build

Run

npm start
# or
node build/index.js

The server runs on stdio and logs availability-server: MCP server running on stdio to stderr.

Use it with Claude Desktop

Add this to your Claude Desktop MCP config (claude_desktop_config.json):

{
  "mcpServers": {
    "availability": {
      "command": "node",
      "args": ["/absolute/path/to/mcp-availability-server/build/index.js"]
    }
  }
}

Restart Claude Desktop, and the two tools will be available in conversation.

Tools

check_availability

Input	Type	Description
date	string (YYYY-MM-DD)	The date to check. Weekends return no slots.

format_call_summary

Input	Type	Description
caller	string	Caller name or number
intent	string	What the caller wanted
next_action	string	The agreed next step

License

MIT