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TypeScript
Hybrid

list-calendar-events-delta

list-calendar-events-delta
Read-only

Get calendar event changes (additions, deletions, updates) in a date range so you can sync a local store without repeatedly fetching the full calendar.

Instructions

Get a set of event resources that have been added, deleted, or updated in a calendarView (a range of events defined by start and end dates) of the user's primary calendar. Typically, synchronizing events in a calendarView in a local store entails a round of multiple delta function calls. The initial call is a full synchronization, and every subsequent delta call in the same round gets the incremental changes (additions, deletions, or updates). This allows you to maintain and synchronize a local store of events in the specified calendarView, without having to fetch all the events of that calendar from the server every time.

💡 TIP: Incremental sync of events across the default calendar. First call returns all events plus @odata.deltaLink. Subsequent calls with that link return only additions/updates/removals. Use $select to limit fields. Deltas expire after ~30 days — start over if the server returns 410 Gone. For a time-bounded view with delta semantics, use list-calendar-view-delta instead.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
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 in one pair of double quotes; directory (users/groups) instead quotes each clause with no outer pair. Cannot combine with $filter.
selectNoComma-separated fields to return, e.g. id,subject,from,receivedDateTime
orderbyNoSort expression, e.g. receivedDateTime desc
skiptokenNoNext page: the @odata.nextLink from the previous response. Keep the other arguments the same.
endDateTimeYesThe end date and time of the time range in the function, 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 in the function, represented in ISO 8601 format. For example, 2019-11-08T20:00:00-08:00
includeHeadersNoInclude response headers (including ETag) in the response metadata
excludeResponseNoExclude the full response body and only return success or failure indication

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed9 schema fields changedv0.154.2
    • 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 / orderby / anyOf
      Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "items": {
+      "type": "string"
+    },
+    "type": "array"
+  }
+]
    • removedInput schema / properties / orderby / type
      Removed value: -"string"
    • addedInput schema / properties / select / anyOf
      Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "items": {
+      "type": "string"
+    },
+    "type": "array"
+  }
+]
    • removedInput schema / properties / select / type
      Removed value: -"string"
    • addedInput schema / properties / skip / minimum
      Added value: +0
    • changedInput schema / properties / skip / type
      Previous value: -"number"New value: +"integer"
  2. Changed1 schema field changedv0.154.0
    • changedInput schema / properties / skiptoken / description
      Previous value: -"Opaque cursor for the next page, taken from the previous response. Copy the $skiptoken value out of @odata.nextLink (or paste the whole nextLink URL — the token is extracted from it) and resend it with the SAME $filter/$select/$expand/$top as the first call. Use this to walk pages one at a time instead of fetchAllPages. Omit it for the first page."New value: +"Next page: the @odata.nextLink from the previous response. Keep the other arguments the same."
  3. Changed2 schema fields changedv0.153.0
    • changedInput schema / properties / search / description
      Previous value: -"KQL search query — wrap value in double quotes. Cannot combine with $filter."New value: +"KQL search query in one pair of double quotes; directory (users/groups) instead quotes each clause with no outer pair. Cannot combine with $filter."
    • addedInput schema / properties / skiptoken
      Added value: +{
+  "description": "Opaque cursor for the next page, taken from the previous response. Copy the $skiptoken value out of @odata.nextLink (or paste the whole nextLink URL — the token is extracted from it) and resend it with the SAME $filter/$select/$expand/$top as the first call. Use this to walk pages one at a time instead of fetchAllPages. Omit it for the first page.",
+  "type": "string"
+}
  4. Addedv0.134.4
  5. Removedv0.131.2
  6. Changed1 schema field changedv0.125.1
    • removedInput schema / properties / top
      Removed value: -{
-  "description": "Page 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.",
-  "type": "number"
-}
  7. Addedv0.114.0
  8. Removedv0.112.2
  9. Addedv0.110.0
  10. Removedv0.108.0
  11. Addedv0.96.0

TDQS

A4.3/5.0
Behavior5/5

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

The description discloses important behavioral details beyond the annotations: the first call returns all events plus @odata.deltaLink, subsequent calls return only changes, delta links expire after ~30 days, and a 410 Gone means restarting. It also advises using $select to limit fields, which is valuable operational context.

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 front-loaded with a clear definition and includes a well-structured tip with the most actionable guidance. However, the first paragraph repeats some of the tip's content about full sync versus incremental calls, so it could be tightened slightly.

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

Completeness4/5

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

The description covers the delta lifecycle, expiry, error handling, and a sibling alternative, which is substantial for a complex tool. The main gap is that no schema parameter is explicitly identified for passing the returned @odata.deltaLink on subsequent calls, even though the tip instructs agents to use it.

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%, so the schema already documents all 13 parameters. The description adds useful context about startDateTime and endDateTime defining the calendarView range and suggests using $select, but it does not systematically enrich parameter meaning beyond the schema.

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?

The description opens with a specific verb and resource: 'Get a set of event resources that have been added, deleted, or updated in a calendarView... of the user's primary calendar.' It clearly explains delta semantics and distinguishes the tool from list-calendar-view-delta in the tip.

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?

The description clearly frames when to use the tool: synchronizing a local event store with an initial full sync followed by incremental delta calls. It explicitly names an alternative, list-calendar-view-delta, for time-bounded views with delta semantics, though it does not mention every sibling alternative such as list-calendar-events.

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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