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Softeria

Microsoft 365 MCP Server

by Softeria
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TypeScript
Hybrid

list-mail-folders

list-mail-folders
Read-only

Get the mail folder collection directly under the root folder of the signed-in user. The returned collection includes any mail search folders directly under the root. By default, this operation doesn't return hidden folders.

Instructions

Get the mail folder collection directly under the root folder of the signed-in user. The returned collection includes any mail search folders directly under the root. By default, this operation doesn't return hidden folders. Use a query parameter includeHiddenFolders to include them in the response. This operation doesn't return all mail folders in a mailbox, only the child folders of the root folder. To return all mail folders in a mailbox, each child folder must be traversed separately.

Input 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(). The response then includes @odata.count, the total for the filtered collection, which can exceed the items returned when fetchAllPages hits its page/item cap.
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". Request ordinary fields with $select instead. Some APIs accept only one relationship per request, so prefer a single value. Some relationships support nested selection, e.g. children($select=id,name).
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.
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
includeHiddenFoldersNoInclude Hidden Folders

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changedv0.166.0
    • changedInput schema / properties / count / description
      Previous value: -"Set true to enable advanced query mode (ConsistencyLevel: eventual). Required for complex $filter on flag/flagStatus or contains()."New value: +"Set true to enable advanced query mode (ConsistencyLevel: eventual). Required for complex $filter on flag/flagStatus or contains(). The response then includes @odata.count, the total for the filtered collection, which can exceed the items returned when fetchAllPages hits its page/item cap."
    • changedInput schema / properties / expand / description
      Previous value: -"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."New value: +"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\". Request ordinary fields with $select instead. Some APIs accept only one relationship per request, so prefer a single value. Some relationships support nested selection, e.g. children($select=id,name)."
  2. Changed11 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"
    • addedInput schema / properties / top / minimum
      Added value: +0
    • changedInput schema / properties / top / type
      Previous value: -"number"New value: +"integer"
  3. 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."
  4. 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"
+}
  5. Addedv0.134.4
  6. Removedv0.131.2
  7. Addedv0.114.0
  8. Removedv0.112.2
  9. Addedv0.110.0
  10. Removedv0.108.0
  11. Changed16 schema fields changedv0.96.0
    • changedInput schema / properties / count / description
      Previous value: -"Include count of items"New value: +"Set true to enable advanced query mode (ConsistencyLevel: eventual). Required for complex $filter on flag/flagStatus or contains()."
    • 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 / filter / description
      Previous value: -"Filter items by property values"New value: +"OData filter expression. Add $count=true for advanced filters (flag/flagStatus, contains()). Cannot combine with $search."
    • changedInput schema / properties / orderby / description
      Previous value: -"Order items by property values"New value: +"Sort expression, e.g. receivedDateTime desc"
    • removedInput schema / properties / orderby / items
      Removed value: -{
-  "type": "string"
-}
    • changedInput schema / properties / orderby / type
      Previous value: -"array"New value: +"string"
    • changedInput schema / properties / search / description
      Previous value: -"Search items by search phrases"New value: +"KQL search query — wrap value in double quotes. Cannot combine with $filter."
    • 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"
    • changedInput schema / properties / skip / description
      Previous value: -"Skip the first n items"New value: +"Items to skip for pagination. Not supported with $search."
    • removedInput schema / properties / skip / minimum
      Removed value: -0
    • changedInput schema / properties / skip / type
      Previous value: -"integer"New value: +"number"
    • changedInput schema / properties / top / description
      Previous value: -"Show only the first n items"New value: +"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."
    • removedInput schema / properties / top / minimum
      Removed value: -0
    • changedInput schema / properties / top / type
      Previous value: -"integer"New value: +"number"
  12. First observedv0.31.0

TDQS

A4.3/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered, and the description adds genuine behavior beyond that: hidden folders are excluded by default and only appear with includeHiddenFolders, plus the depth limitation of the result set. It does not discuss pagination, but that is handled per-parameter in the schema.

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?

Front-loaded with the core operation, then scope caveats. Slightly redundant — the 'doesn't return all mail folders… only child folders of the root folder' sentence overlaps with the opening scope statement — but every sentence carries real information.

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?

No output schema and a read-only operation, so the description's job is scope and filtering defaults, both of which are covered. With 13 parameters and no output schema, an agent still gets a complete picture of what comes back and how to widen it.

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

Parameters4/5

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

Schema coverage is 100%, so the baseline is 3, and the description goes one step further by explaining the default hidden-folder behavior that includeHiddenFolders toggles. The remaining query options (top, filter, search, etc.) are left entirely to 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?

States a specific verb+resource ('Get the mail folder collection') and pins the scope to direct children of the root folder, explicitly noting it does not return the whole mailbox tree. This scope statement lets an agent distinguish it from list-mail-child-folders and list-mail-folder-messages without opening schemas.

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?

Clearly frames when the tool applies (children of root only) and explains the follow-up path — 'each child folder must be traversed separately' — for a full-mailbox walk. It stops short of naming the sibling tool that performs that traversal, so the alternative is implied rather than explicit.

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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