Microsoft 365 MCP Server

get-calendar-event

get-calendar-event

Read-only

Retrieve a Microsoft 365 calendar event's properties, relationships, and custom extensions. Supports timezone conversion, field selection, and expanding related data like attachments.

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

Name	Required	Description
`expand`	No	Navigation 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.
`select`	No	Comma-separated fields to return, e.g. id,subject,from,receivedDateTime
`eventId`	Yes	Value 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.
`timezone`	No	IANA timezone name (e.g., "America/New_York", "Europe/London", "Asia/Tokyo") for calendar event times. If not specified, times are returned in UTC.
`fetchAllPages`	No	Follow @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.
`includeHeaders`	No	Include response headers (including ETag) in the response metadata
`excludeResponse`	No	Exclude the full response body and only return success or failure indication
`expandExtendedProperties`	No	When true, expands singleValueExtendedProperties on each event. Use this to retrieve custom extended properties (e.g., sync metadata) stored on calendar events.

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedv0.154.2Sep 17, 2026

addedInput schema / properties / expand / anyOf

Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "items": {
+      "type": "string"
+    },
+    "type": "array"
+  }
+]

removedInput schema / properties / expand / items
```
Removed value: -{
-  "type": "string"
-}
```
removedInput schema / properties / expand / type
```
Removed value: -"array"
```

addedInput schema / properties / select / anyOf

Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "items": {
+      "type": "string"
+    },
+    "type": "array"
+  }
+]

removedInput schema / properties / select / type
```
Removed value: -"string"
```

Addedv0.134.4Jul 28, 2026
Removedv0.131.2Jul 18, 2026
Addedv0.114.0May 28, 2026
Removedv0.112.2May 22, 2026
Addedv0.110.0May 18, 2026
Removedv0.108.0May 15, 2026

Changed5 schema fields changedv0.96.0May 4, 2026

addedInput schema / properties / expandExtendedProperties

Added value: +{
+  "description": "When true, expands singleValueExtendedProperties on each event. Use this to retrieve custom extended properties (e.g., sync metadata) stored on calendar events.",
+  "type": "boolean"
+}

changedInput schema / properties / fetchAllPages / description

Previous value: -"Automatically fetch all pages of results"New value: +"Follow @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."

changedInput schema / properties / select / description

Previous value: -"Select properties to be returned"New value: +"Comma-separated fields to return, e.g. id,subject,from,receivedDateTime"

removedInput schema / properties / select / items
```
Removed value: -{
-  "type": "string"
-}
```

changedInput schema / properties / select / type

Previous value: -"array"New value: +"string"

First observedv0.31.0Jan 27, 2026

TDQS

C2.9/5.0

Behavior3/5

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

Annotations already provide readOnlyHint=true and destructiveHint=false, so the bar is lower. The description adds that event bodies are returned only in HTML format and mentions support for extensions/custom properties, which is useful. However, it does not disclose pagination behavior, response size limits, or potential errors, and the second sentence is confusing rather than illuminating.

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

Conciseness2/5

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

The description is short but poorly structured. The second sentence contains a grammatical error and a redundant colon, making it confusing. While the core purpose is front-loaded, the remainder lacks coherence, and the sentence about extensions is tangential and not clearly connected to the tool's operation.

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

Completeness2/5

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

With no output schema, the description should explain what the response contains; it only vaguely says 'properties and relationships' without specifics. It also fails to distinguish this tool from get-specific-calendar-event and does not mention how to obtain eventId from a prior list call. The detailed schema covers parameters, but overall the description leaves an agent with unresolved questions about when and how to call this tool correctly.

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?

Schema description coverage is 100%, and the parameter descriptions themselves are exceptionally detailed (e.g., expand, select, timezone, fetchAllPages). The tool description adds no additional meaning beyond what the schema already provides, so the baseline score of 3 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 tool gets the properties and relationships of a specified event object, which conveys the core action. However, it does not differentiate from sibling tools like get-specific-calendar-event or list-calendar-events, and the second sentence about scenarios is vague and obscures the main purpose.

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?

There is no explicit guidance on when to use this tool versus alternatives. The mention of 'two scenarios where an app can get an event in another user's calendar' is ambiguous and does not help an agent choose between this, get-specific-calendar-event, or list-calendar-event-instances. No alternatives or exclusions are named.

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

Deploy Server

get-calendar-event

Instructions

Input Schema

Schema Changelog

TDQS

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