Baby Age

What baby-age MCP server does

The baby-age MCP server provides birthday-based calculations through the Baby Age Calculator service. Given a date in YYYY-MM-DD format, it can return an exact baby age, the corresponding zodiac sign, milestone information, and special days. It is intended for AI assistants that need calendar calculations handled by a dedicated service rather than generated by hand.

The service is hosted at https://babyagecalculator.com/api/mcp/. Because the endpoint is already available online, users do not need to run a local process or deploy infrastructure. The service does not require an API key or sign-up.

How it works

An MCP-compatible client connects to the hosted endpoint over HTTP and makes birthday-related tool calls. The server performs the date calculations and returns structured results to the assistant, which can then use those results in a broader response or workflow.

The same service also exposes a public JSON API. Its age endpoint accepts a birthday query parameter, while separate endpoints return milestone types and zodiac data. JSON API responses use a common structure containing code, data, error, and meta; the requested payload is in data. Invalid dates produce HTTP 400 responses with a message in error.message.

Setup and configuration

For Claude Code, add the hosted endpoint with:

claude mcp add --transport http baby-age https://babyagecalculator.com/api/mcp/

Claude Desktop and Cursor can use an MCP configuration entry with the endpoint URL:

{
  "mcpServers": {
    "baby-age-calculator": {
      "type": "http",
      "url": "https://babyagecalculator.com/api/mcp/"
    }
  }
}

No environment variables or credentials are required. The repository also provides an SKILL.md file for assistants that do not use MCP, plus a public machine-readable instruction file at https://babyagecalculator.com/llms.txt.

Tools and capabilities

The baby-age MCP server exposes four tools:

• get_baby_age(birthday) returns an exact age, zodiac sign, current or next milestone, and special days.
• get_milestone_dates(birthday) returns calendar dates for all 25 milestones.
• list_milestones() lists the 25 available milestone types.
• get_zodiac_sign(birthday) returns the zodiac sign for a birthday.

The JSON API provides comparable access through GET /api/age/?birthday=YYYY-MM-DD, GET /api/milestones/, and GET /api/zodiac/.

Limitations and notes

Inputs must be valid birthdays in the supported date format when using the documented API request. The material does not describe authentication, custom milestone definitions, regional date settings, or write operations. The MCP endpoint is hosted by Baby Age Calculator, so clients need network access to use it. The repository is licensed under MIT.