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Create an event

events_create
Destructive

Create an event - schedule a meeting, book an appointment, block out time - in one of a connected account's own calendars: the one named by the calendarId calendars_list gives, else the account's default; a calendar only shared with the account is refused. Guests are invited by that account's provider: Microsoft or Google from the account's own address, Apple from its own address under the person's name, and a calendar server from the account's own address where it says it sends invitations, a meeting with guests refused elsewhere. A timed event's start and end are instants with their offset, the end no earlier than the start, so an entry of no length is taken; an all-day event's are dates, its end the day after its last. It is written in the person's own time zone, so an invitation shows that zone's time, and the answer gives its times in the zone it names under timeZone. A meeting with guests, no location and no video gets the person's default meeting link as its place. How it shows, its privacy, reminders, kind and video link are each refused with the reason where the account's provider lacks them. An Outlook subject takes at most 255 characters. repeat makes it a recurring series, each occurrence keeping the start's own hour in the person's time zone across clock changes. Who hears of it is notify's choice. Repeating a create whose answer was lost, with the same arguments, finds the event the first made rather than making a second - for the rest of that day (UTC), on Outlook only while Microsoft also recognises the repeat - so two events meant as two differ in some argument. Each guest's own times are answered under guestTimes in their time zone where it is known - the one guestZones names for them, else the one a member of the person's circles stored - and any other guest's zone as unknown, their time counted as the person's. A meeting any part of which falls, for a guest of known zone, outside 09:00-18:00 or on a Saturday or Sunday in that zone - an all-day one only on a Saturday or Sunday - is not sent: the refusal names each such guest and their time, and it goes out only once the call passes unusualHoursAgreed true on the person's word. A series is checked by its first occurrence; the person's own hours are never held.

Input Schema

NameRequiredDescriptionDefault
endYes
bodyNo
kindNoGoogle makes either only in a Workspace account's main calendar, timed; Outlook makes out of office alone, shown away.
startYes
videoNoA Meet link on a Google account or a Teams link on a work Microsoft account, given back under joinUrl.
guestsNoAddresses to invite.
notifyNoWho the provider tells: every guest where omitted, externalOnly only guests outside Google Calendar, none nobody. Outlook tells every guest of a meeting it makes, changes or cancels, so there only an answer goes untold.
repeatNoMakes it a recurring series, from its start, without end unless until or count is named.
showAsNoHow it shows; Google shows busy or free alone. Busy where omitted.
accountYesThe connected account, by the address calendars_list names.
privacyNoThe calendar's own where omitted.
subjectYes
locationNo
providerNoThe account's provider, as calendars_list names it; needed only where two connected accounts share an address.
remindersNoMinutes before its start each reminder sounds, Outlook keeping one; empty for none, the calendar's own where omitted.
calendarIdNoThe calendar to create it in, by the calendarId calendars_list names; the account's default where omitted.
guestZonesNoA guest's own time zone, only as the person names it - never inferred from an address, a language or a provider.
unusualHoursAgreedNoTrue only once the person has agreed to send at the hours an answer named as unusual for a guest.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / provider / enum
      Previous value: -[
      -  "google",
      -  "microsoft",
      -  "icloud"
      -]New value: +[
      +  "google",
      +  "microsoft",
      +  "icloud",
      +  "caldav"
      +]
  2. Changed1 schema field changed
    • changedInput schema / properties / provider / enum
      Previous value: -[
      -  "google",
      -  "microsoft"
      -]New value: +[
      +  "google",
      +  "microsoft",
      +  "icloud"
      +]
  3. First observed

TDQS

A4.6/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Goes far beyond the destructive/openWorld annotations: it discloses provider-specific invitation behavior (Microsoft/Google/Apple/CalDAV), idempotency semantics for retried creates (same-argument repeat finds the first event, for the rest of the UTC day, Microsoft-dependent), silent non-send on unusual-hours violations, and per-feature refusals with reasons. This is exactly the behavioral load the annotations alone cannot carry.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Purpose is front-loaded and nearly every clause encodes a distinct rule, but the single dense paragraph of semicolon-chained clauses is hard to scan and parse. For an 18-parameter tool some length is warranted, yet it could be broken into labeled sections without losing content.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

No output schema exists, and the description compensates by describing what comes back (times under timeZone, guestTimes/guestZones, joinUrl). Combined with provider gaps, idempotency, and refusal paths, an agent has what it needs to call this correctly across providers.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

At 72% schema coverage the description still meaningfully extends the schema: it explains the dual date vs date-time semantics of start/end and the 'end day after last' all-day rule, repeating-series behavior across clock changes, guestZones precedence, and how notify maps to 'who hears of it.' It adds real meaning rather than restating fields.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Opens with a specific verb+resource ('Create an event') immediately narrowed to 'one of a connected account's own calendars,' and explicitly excludes shared-only calendars. The agent can tell this apart from events_edit/events_get without opening a schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives concrete applicability conditions: calendarId from calendars_list else default, shared calendars refused, guests must resolve to a provider that sends invitations, and unusual-hours sends require unusualHoursAgreed=true. It routes to calendars_list for IDs but never names sibling mutation alternatives like events_edit, so the when-not-what-else picture is incomplete.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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