What is Chronary?

Chronary is a calendar API purpose-built for AI agents. It handles calendars, events, availability queries, and sync with human calendar apps — so your agent doesn’t have to.

Who it’s for

• AI agent developers building scheduling, booking, or coordination features
• Teams that need agents to manage calendars across multiple participants
• Any builder who wants Chronary to handle agent calendars plus human-approved Google/Outlook OAuth

What you get

Calendar & Event CRUD

Create calendars, manage events, and query across agents with a clean REST API.

Availability Engine

Single-agent and cross-agent availability queries with timezone-aware slot calculation.

Human Calendar Bridge

Connect Google Calendar or Microsoft Outlook for private combined availability, with optional event publishing to Microsoft Outlook. iCal remains available as a read-only fallback.

Webhooks

Get notified when events change. HMAC-SHA256 signed, with automatic retries.

MCP Server

54 tools accessible from any MCP-compatible AI client — including human-calendar setup links.

Free Tier

3 agents, 10 calendars, 50,000/mo API calls. $0 to start.

How it works

Your Agent  →  Chronary API  →  Calendars, Events, Combined Availability
                    ↕
            Google Calendar / Microsoft Outlook

Your agent calls the Chronary API (REST or MCP) to create calendars, schedule events, request human setup, and check combined availability. Humans approve OAuth, choose source calendars and agent mappings, and (for Microsoft Outlook) optionally publish Chronary events back to a selected calendar.

Next steps

QuickstartFirst API call in under 5 minutes

Python SDKInstall the SDK and get started in Python

AuthenticationAPI keys and how to authenticate

MCP ServerConnect to Claude Desktop, ChatGPT, Cursor

Human CalendarsGoogle and Microsoft OAuth, mappings, health, and Microsoft publishing

API ReferenceAll endpoints documented