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get-calendar-event

get-calendar-event
Read-only

Retrieve properties and relationships of a calendar event, including custom extensions. Specify the event ID to get event details and extended properties.

Instructions

Get the properties and relationships of the specified event object. Currently, this operation returns event bodies in only HTML format. There are two scenarios where an app can get an event in another user's calendar: Since the event resource supports extensions, you can also use the GET operation to get custom properties and extension data in an event instance.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
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.
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.
timezoneNoIANA timezone name (e.g., "America/New_York", "Europe/London", "Asia/Tokyo") for calendar event times. If not specified, times are returned in UTC.
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.
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?

Beyond the annotations (readOnlyHint=true, destructiveHint=false), the description discloses that event bodies are returned only in HTML format and that extensions are supported for custom properties. This adds valuable behavioral context without contradicting annotations.

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?

The description is two paragraphs with some redundant phrasing (e.g., 'Since the event resource supports extensions...'). It could be more concise by trimming unnecessary elaboration, but it is not overly long.

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 tool has 8 parameters, no output schema, and moderate complexity, the description covers basic purpose and a few behavioral traits but lacks information on pagination, error handling, or response structure. It is adequate but could be more comprehensive.

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?

The input schema has 100% parameter description coverage, so baseline is 3. The description adds little beyond what the schema provides—it mentions the HTML format but no parameter-specific details. Baseline is appropriate.

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 verb ('Get') and resource ('properties and relationships of the specified event object'). It also mentions that it returns HTML body and can access other users' calendars, but does not explicitly differentiate from sibling tools like get-calendar-view or get-specific-calendar-event.

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

Usage Guidelines2/5

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

The description mentions two scenarios for getting events in another user's calendar, but provides no explicit guidance on when to use this tool versus list-calendar-events or other get tools. No prerequisites or exclusion criteria are given.

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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