Build an Availability Source-of-Truth API for AI Scheduling Agents

1. 1

   Model availability as policy, not free-busy

   The core engine encodes what calendars cannot say: protected blocks, buffers by meeting type, daily meeting caps, requester-priority tiers, and conditional rules like no calls before ten except for these three people. The policy model, expressive but explainable, is the product's intellectual core.

2. 2

   Design the API for agent consumption

   Endpoints that answer the questions agents actually ask: is this slot bookable for this requester at this priority, what are the best three options this week, and hold-then-confirm flows with expirations. Deterministic, fast, and documented for LLM tool-use patterns, because your integrators are prompt engineers as much as backend developers.

3. 3

   Give the human a control panel they trust

   Users set policies in plain language with previews of what each rule permits, and see an audit log of every availability decision made on their behalf: which agent asked, what was answered, why. Trust in the enforcement layer is what lets people delegate scheduling at all.

4. 4

   Integrate the calendar backbones flawlessly

   Rock-solid sync with the two dominant calendar ecosystems, handling the gnarly real world of recurring events, time zones, and last-minute changes. A stale availability answer that double-books an executive is the failure mode that churns accounts; engineer and monitor against it obsessively.

5. 5

   Price per check with platform tiers

   Usage-based pricing per availability decision, with tiers for assistant platforms embedding you across their user base. Individual power users and executive assistants are the early adopters; the scale story is agent platforms that would rather integrate the availability layer than rebuild it.

6. 6

   Ride the agent ecosystem standards

   Publish integrations for the emerging agent tool-calling standards early, and be present in the developer communities defining them. Infrastructure wins by being the default everyone documents; early standard-presence is cheap and compounding.

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