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MCP and AI assistants

Use Calcadian's MCP tools for basic date calculations inside compatible AI assistants. For applications, scheduled workflows and higher-volume use, use the API.

What MCP Basic is

MCP is a standard way for an AI assistant to call an external tool. Calcadian exposes 8 basic date tools over it: date difference, adding days, business days, day of the week, age, time duration, week number and Unix timestamp conversion. The assistant calls them instead of guessing at date arithmetic.

Setup instructions for compatible clients are on the connect page.

Anonymous limits

  • 30 requests a minute for each IP address.
  • 200 requests a day for each IP address.
  • Basic tools only. Business Calendars, batch and reports are not available anonymously.

Authenticated MCP

You can send an API key with MCP calls. Authenticated use draws on your account's monthly API quota, exactly like a direct API request, and the per-IP anonymous caps no longer apply.

MCP or the API

MCP suits a person asking an assistant a question. The API suits software: it is versioned, it returns a documented error model with a request id, it supports Business Calendars, and its limits are tied to your plan rather than to an IP address. If something runs on a schedule or in production, use the API.