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list-calendar-event-instances

list-calendar-event-instances
Read-only

List all occurrences of a recurring calendar event within a specified date range. Use start and end times in ISO 8601 format to expand the series master into individual instances.

Instructions

The occurrences of a recurring series, if the event is a series master. This property includes occurrences that are part of the recurrence pattern, and exceptions modified, but doesn't include occurrences canceled from the series. Navigation property. Read-only. Nullable.

đź’ˇ TIP: Expand a recurring event into individual instances within a date range. Requires startDateTime and endDateTime query parameters in ISO 8601 format (e.g., 2024-01-01T00:00:00Z). Use this to see all occurrences of a recurring event.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
topNoPage size (Graph $top). Start small (e.g. 5–15) so responses fit the model context; raise only if needed. Use $select to return fewer fields per item. For more rows, use @odata.nextLink from the response instead of a very large $top.
skipNoItems to skip for pagination. Not supported with $search.
countNoSet true to enable advanced query mode (ConsistencyLevel: eventual). Required for complex $filter on flag/flagStatus or contains().
expandNoNavigation properties to inline, e.g. attachments on a message or event. Only navigation properties can be expanded: expanding a non-navigation property such as a message body fails with "Parsing OData Select and Expand failed", and an unsupported value may be ignored rather than reported. Request ordinary fields with $select instead.
filterNoOData filter expression. Add $count=true for advanced filters (flag/flagStatus, contains()). Cannot combine with $search.
searchNoKQL search query — wrap value in double quotes. Cannot combine with $filter.
selectNoComma-separated fields to return, e.g. id,subject,from,receivedDateTime
eventIdYesValue for the 'eventId' path segment. Pass it under the name 'eventId', not as 'id'. Use the 'id' field of the event object as returned by Microsoft Graph.
orderbyNoSort expression, e.g. receivedDateTime desc
timezoneNoIANA timezone name (e.g., "America/New_York", "Europe/London", "Asia/Tokyo") for calendar event times. If not specified, times are returned in UTC.
calendarIdYesValue for the 'calendarId' path segment. Pass it under the name 'calendarId', not as 'id'. Use the 'id' field of the calendar object as returned by Microsoft Graph.
endDateTimeYesThe end date and time of the time range, represented in ISO 8601 format. For example, 2019-11-08T20:00:00-08:00
fetchAllPagesNoFollow @odata.nextLink and merge up to 100 pages into one response. Can return enormous payloads—only when the user explicitly needs a full export. Prefer a small $top first, then paginate or narrow with $filter/$search.
startDateTimeYesThe start date and time of the time range, represented in ISO 8601 format. For example, 2019-11-08T19:00:00-08:00
includeHeadersNoInclude response headers (including ETag) in the response metadata
excludeResponseNoExclude the full response body and only return success or failure indication
expandExtendedPropertiesNoWhen true, expands singleValueExtendedProperties on each event. Use this to retrieve custom extended properties (e.g., sync metadata) stored on calendar events.
Behavior4/5

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

The description adds behavioral context beyond annotations by explaining that the property includes occurrences that are part of the recurrence pattern and exceptions, but excludes canceled occurrences. It also confirms read-only behavior, aligning with annotations. This helps the agent understand the data scope.

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

Conciseness4/5

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

The description is relatively concise, with a clear tip at the start using a symbol. The first sentence is somewhat technical but informative. Overall, it is well-structured and front-loaded, with no unnecessary text.

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

Completeness3/5

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

Given the complexity (17 parameters, no output schema), the description is adequate but incomplete. It explains the input requirements but does not describe the response format (e.g., list of event instances). An agent might need to infer the output from the tool's purpose.

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

Parameters3/5

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

With 100% parameter schema coverage, the baseline is 3. The description does not add significant new meaning beyond the schema; the tip mentions start and end date format, which is already covered in the schema descriptions. Thus, no extra value beyond the schema.

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

Purpose4/5

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

The description clearly states the tool lists occurrences of a recurring calendar event within a date range. It specifies that it is a navigation property and read-only. However, it does not explicitly differentiate this tool from similar calendar tools like list-calendar-events or get-calendar-event, which could confuse selection.

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

Usage Guidelines3/5

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

The description includes a tip that requires startDateTime and endDateTime in ISO 8601 format, providing essential usage guidance. However, it does not specify when to prefer this tool over alternatives (e.g., for non-recurring events), nor does it mention when not to use it.

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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