Microsoft 365 MCP Server

create-reply-all-draft

create-reply-all-draft

Destructive

Creates a draft reply to the sender and all recipients of a Microsoft 365 message, so you can review or update the response before sending.

Instructions

Create a draft to reply to the sender and all recipients of a message in either JSON or MIME format. When using JSON format:

Specify either a comment or the body property of the message parameter. Specifying both will return an HTTP 400 Bad Request error.
If the original message specifies a recipient in the replyTo property, per Internet Message Format (RFC 2822), you should send the reply to the recipients in the replyTo and toRecipients properties, and not the recipients in the from and toRecipients properties.
You can update the draft later to add reply content to the body or change other message properties. When using MIME format:
Provide the applicable Internet message headers and the MIME content, all encoded in base64 format in the request body.
Add any attachments and S/MIME properties to the MIME content. Send the draft message in a subsequent operation. Alternatively, reply-all to a message in a single action.

💡 TIP: For HTML replies pass Message.body.contentType: 'html' with Message.body.content as HTML. Note: supplying Message.body replaces the whole draft body, so the original quoted history is not included. Specifying both 'comment' and Message.body returns 400. Signatures are added by the Outlook client only, not via Graph.

Input Schema

Name	Required	Description
`body`	Yes
`confirm`	No	For destructive operations when the confirm gate is enabled (MS365_MCP_REQUIRE_CONFIRM=true; off by default). Set to true only after the user has explicitly approved this action. When the gate is on, calls without confirm: true return { error: "confirmation_required" } without touching user data.
`messageId`	Yes	Value for the 'messageId' path segment. Pass it under the name 'messageId', not as 'id'. Use the 'id' field of the message object as returned by Microsoft Graph.
`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

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv0.176.1Oct 29, 2026

changedInput schema / properties / body / properties / Message / anyOf

Previous value: -[
-  {
-    "additionalProperties": true,
-    "properties": {
-      "attachments": {
-        "description": "The fileAttachment and itemAttachment attachments for the message.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "contentType": {
-              "description": "The MIME type.",
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "id": {
-              "description": "The unique identifier for an entity. Read-only.",
-              "type": "string"
-            },
-            "isInline": {
-              "description": "true if the attachment is an inline attachment; otherwise, false.",
-              "type": "boolean"
-            },
-            "lastModifiedDateTime": {
-              "anyOf": [
-                {
-                  "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
-                  "format": "date-time",
-                  "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
-            },
-            "name": {
-              "description": "The attachment's file name.",
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "size": {
-              "description": "The length of the attachment in bytes.",
-              "maximum": 2147483647,
-              "minimum": -2147483648,
-              "type": "number"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "bccRecipients": {
-        "description": "The Bcc: recipients for the message.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "emailAddress": {
-              "additionalProperties": true,
-              "properties": {
-                "address": {
-                  "description": "The email address of the person or entity.",
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "name": {
-                  "description": "The display name of the person or entity.",
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                }
-              },
-              "type": "object"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "body": {
-        "additionalProperties": true,
-        "properties": {
-          "content": {
-            "description": "The content of the item.",
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "contentType": {
-            "enum": [
-              "text",
-              "html"
-            ],
-            "type": "string"
-          }
-        },
-        "type": "object"
-      },
-      "bodyPreview": {
-        "description": "The first 255 characters of the message body. It is in text format.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "categories": {
-        "description": "The categories associated with the item",
-        "items": {
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "type": "array"
-      },
-      "ccRecipients": {
-        "description": "The Cc: recipients for the message.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "emailAddress": {
-              "additionalProperties": true,
-              "properties": {
-                "address": {
-                  "description": "The email address of the person or entity.",
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "name": {
-                  "description": "The display name of the person or entity.",
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                }
-              },
-              "type": "object"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "changeKey": {
-        "description": "Identifies the version of the item. Every time the item is changed, changeKey changes as well. This allows Exchange to apply changes to the correct version of the object. Read-only.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "conversationId": {
-        "description": "The ID of the conversation the email belongs to.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "conversationIndex": {
-        "description": "Indicates the position of the message within the conversation.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "createdDateTime": {
-        "anyOf": [
-          {
-            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
-            "format": "date-time",
-            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
-      },
-      "flag": {
-        "additionalProperties": true,
-        "properties": {
-          "completedDateTime": {
-            "additionalProperties": true,
-            "properties": {
-              "dateTime": {
-                "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
-                "type": "string"
-              },
-              "timeZone": {
-                "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "type": "object"
-          },
-          "dueDateTime": {
-            "additionalProperties": true,
-            "properties": {
-              "dateTime": {
-                "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
-                "type": "string"
-              },
-              "timeZone": {
-                "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "type": "object"
-          },
-          "flagStatus": {
-            "enum": [
-              "notFlagged",
-              "complete",
-              "flagged"
-            ],
-            "type": "string"
-          },
-          "startDateTime": {
-            "additionalProperties": true,
-            "properties": {
-              "dateTime": {
-                "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
-                "type": "string"
-              },
-              "timeZone": {
-                "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "type": "object"
-          }
-        },
-        "type": "object"
-      },
-      "from": {
-        "additionalProperties": true,
-        "properties": {
-          "emailAddress": {
-            "additionalProperties": true,
-            "properties": {
-              "address": {
-                "description": "The email address of the person or entity.",
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "name": {
-                "description": "The display name of the person or entity.",
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "type": "object"
-          }
-        },
-        "type": "object"
-      },
-      "hasAttachments": {
-        "description": "Indicates whether the message has attachments. This property doesn't include inline attachments, so if a message contains only inline attachments, this property is false. To verify the existence of inline attachments, parse the body property to look for a src attribute, such as <IMG src='cid:image001.jpg@01D26CD8.6C05F070'>.",
-        "type": [
-          "boolean",
-          "null"
-        ]
-      },
-      "id": {
-        "description": "The unique identifier for an entity. Read-only.",
-        "type": "string"
-      },
-      "importance": {
-        "enum": [
-          "low",
-          "normal",
-          "high"
-        ],
-        "type": "string"
-      },
-      "inferenceClassification": {
-        "enum": [
-          "focused",
-          "other"
-        ],
-        "type": "string"
-      },
-      "internetMessageHeaders": {
-        "description": "A collection of message headers defined by RFC5322. The set includes message headers indicating the network path taken by a message from the sender to the recipient. It can also contain custom message headers that hold app data for the message.  Requires $select to retrieve. Read-only.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "name": {
-              "description": "Represents the key in a key-value pair.",
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "value": {
-              "description": "The value in a key-value pair.",
-              "type": [
-                "string",
-                "null"
-              ]
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "internetMessageId": {
-        "description": "The message ID in the format specified by RFC2822.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "isDeliveryReceiptRequested": {
-        "description": "Indicates whether a read receipt is requested for the message.",
-        "type": [
-          "boolean",
-          "null"
-        ]
-      },
-      "isDraft": {
-        "description": "Indicates whether the message is a draft. A message is a draft if it hasn't been sent yet.",
-        "type": [
-          "boolean",
-          "null"
-        ]
-      },
-      "lastModifiedDateTime": {
-        "anyOf": [
-          {
-            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
-            "format": "date-time",
-            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
-      },
-      "multiValueExtendedProperties": {
-        "description": "The collection of multi-value extended properties defined for the message. Nullable.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "id": {
-              "description": "The unique identifier for an entity. Read-only.",
-              "type": "string"
-            },
-            "value": {
-              "description": "A collection of property values.",
-              "items": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "type": "array"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "singleValueExtendedProperties": {
-        "description": "The collection of single-value extended properties defined for the message. Nullable.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "id": {
-              "description": "The unique identifier for an entity. Read-only.",
-              "type": "string"
-            },
-            "value": {
-              "description": "A property value.",
-              "type": [
-                "string",
-                "null"
-              ]
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "subject": {
-        "description": "The subject of the message.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "toRecipients": {
-        "description": "The To: recipients for the message.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "emailAddress": {
-              "additionalProperties": true,
-              "properties": {
-                "address": {
-                  "description": "The email address of the person or entity.",
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "name": {
-                  "description": "The display name of the person or entity.",
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                }
-              },
-              "type": "object"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "type": "object"
-  },
-  {
-    "additionalProperties": true,
-    "properties": {},
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "properties": {
+      "attachments": {
+        "description": "The fileAttachment and itemAttachment attachments for the message.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "contentType": {
+              "description": "The MIME type.",
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "id": {
+              "description": "The unique identifier for an entity. Read-only.",
+              "type": "string"
+            },
+            "isInline": {
+              "description": "true if the attachment is an inline attachment; otherwise, false.",
+              "type": "boolean"
+            },
+            "lastModifiedDateTime": {
+              "anyOf": [
+                {
+                  "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
+                  "format": "date-time",
+                  "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "name": {
+              "description": "The attachment's file name.",
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "size": {
+              "description": "The length of the attachment in bytes.",
+              "maximum": 2147483647,
+              "minimum": -2147483648,
+              "type": "number"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "bccRecipients": {
+        "description": "The Bcc: recipients for the message.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "emailAddress": {
+              "additionalProperties": true,
+              "properties": {
+                "address": {
+                  "description": "The email address of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "name": {
+                  "description": "The display name of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "body": {
+        "additionalProperties": true,
+        "properties": {
+          "content": {
+            "description": "The content of the item.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "contentType": {
+            "enum": [
+              "text",
+              "html"
+            ],
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "bodyPreview": {
+        "description": "The first 255 characters of the message body. It is in text format.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "categories": {
+        "description": "The categories associated with the item",
+        "items": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "type": "array"
+      },
+      "ccRecipients": {
+        "description": "The Cc: recipients for the message.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "emailAddress": {
+              "additionalProperties": true,
+              "properties": {
+                "address": {
+                  "description": "The email address of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "name": {
+                  "description": "The display name of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "changeKey": {
+        "description": "Identifies the version of the item. Every time the item is changed, changeKey changes as well. This allows Exchange to apply changes to the correct version of the object. Read-only.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "conversationId": {
+        "description": "The ID of the conversation the email belongs to.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "conversationIndex": {
+        "description": "Indicates the position of the message within the conversation.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "createdDateTime": {
+        "anyOf": [
+          {
+            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
+            "format": "date-time",
+            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "flag": {
+        "additionalProperties": true,
+        "properties": {
+          "completedDateTime": {
+            "additionalProperties": true,
+            "properties": {
+              "dateTime": {
+                "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
+                "type": "string"
+              },
+              "timeZone": {
+                "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          "dueDateTime": {
+            "additionalProperties": true,
+            "properties": {
+              "dateTime": {
+                "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
+                "type": "string"
+              },
+              "timeZone": {
+                "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          "flagStatus": {
+            "enum": [
+              "notFlagged",
+              "complete",
+              "flagged"
+            ],
+            "type": "string"
+          },
+          "startDateTime": {
+            "additionalProperties": true,
+            "properties": {
+              "dateTime": {
+                "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
+                "type": "string"
+              },
+              "timeZone": {
+                "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          }
+        },
+        "type": "object"
+      },
+      "from": {
+        "additionalProperties": true,
+        "properties": {
+          "emailAddress": {
+            "additionalProperties": true,
+            "properties": {
+              "address": {
+                "description": "The email address of the person or entity.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "name": {
+                "description": "The display name of the person or entity.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          }
+        },
+        "type": "object"
+      },
+      "hasAttachments": {
+        "description": "Indicates whether the message has attachments. This property doesn't include inline attachments, so if a message contains only inline attachments, this property is false. To verify the existence of inline attachments, parse the body property to look for a src attribute, such as <IMG src='cid:image001.jpg@01D26CD8.6C05F070'>.",
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "id": {
+        "description": "The unique identifier for an entity. Read-only.",
+        "type": "string"
+      },
+      "importance": {
+        "enum": [
+          "low",
+          "normal",
+          "high"
+        ],
+        "type": "string"
+      },
+      "inferenceClassification": {
+        "enum": [
+          "focused",
+          "other"
+        ],
+        "type": "string"
+      },
+      "internetMessageHeaders": {
+        "description": "A collection of message headers defined by RFC5322. The set includes message headers indicating the network path taken by a message from the sender to the recipient. It can also contain custom message headers that hold app data for the message.  Requires $select to retrieve. Read-only.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "name": {
+              "description": "Represents the key in a key-value pair.",
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "value": {
+              "description": "The value in a key-value pair.",
+              "type": [
+                "string",
+                "null"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "internetMessageId": {
+        "description": "The message ID in the format specified by RFC2822.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "isDeliveryReceiptRequested": {
+        "description": "Indicates whether a read receipt is requested for the message.",
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "isDraft": {
+        "description": "Indicates whether the message is a draft. A message is a draft if it hasn't been sent yet.",
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "lastModifiedDateTime": {
+        "anyOf": [
+          {
+            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
+            "format": "date-time",
+            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "multiValueExtendedProperties": {
+        "description": "The collection of multi-value extended properties defined for the message. Nullable.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "id": {
+              "description": "The unique identifier for an entity. Read-only.",
+              "type": "string"
+            },
+            "value": {
+              "description": "A collection of property values.",
+              "items": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "type": "array"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "singleValueExtendedProperties": {
+        "description": "The collection of single-value extended properties defined for the message. Nullable.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "id": {
+              "description": "The unique identifier for an entity. Read-only.",
+              "type": "string"
+            },
+            "value": {
+              "description": "A property value.",
+              "type": [
+                "string",
+                "null"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "subject": {
+        "description": "The subject of the message.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "toRecipients": {
+        "description": "The To: recipients for the message.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "emailAddress": {
+              "additionalProperties": true,
+              "properties": {
+                "address": {
+                  "description": "The email address of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "name": {
+                  "description": "The display name of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "type": "object"
+  },
+  {
+    "additionalProperties": true,
+    "properties": {},
+    "type": "object"
+  }
+]

Changed2 schema fields changedv0.145.2Aug 22, 2026

removedInput schema / $defs

Removed value: -{
-  "def0": {
-    "additionalProperties": true,
-    "properties": {
-      "dateTime": {
-        "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
-        "type": "string"
-      },
-      "timeZone": {
-        "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
-        "type": [
-          "string",
-          "null"
-        ]
-      }
-    },
-    "type": "object"
-  },
-  "def1": {
-    "additionalProperties": true,
-    "properties": {
-      "emailAddress": {
-        "additionalProperties": true,
-        "properties": {
-          "address": {
-            "description": "The email address of the person or entity.",
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "name": {
-            "description": "The display name of the person or entity.",
-            "type": [
-              "string",
-              "null"
-            ]
-          }
-        },
-        "type": "object"
-      }
-    },
-    "type": "object"
-  }
-}

changedInput schema / properties / body / properties / Message / anyOf

Previous value: -[
-  {
-    "additionalProperties": true,
-    "properties": {
-      "attachments": {
-        "description": "The fileAttachment and itemAttachment attachments for the message.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "contentType": {
-              "description": "The MIME type.",
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "id": {
-              "description": "The unique identifier for an entity. Read-only.",
-              "type": "string"
-            },
-            "isInline": {
-              "description": "true if the attachment is an inline attachment; otherwise, false.",
-              "type": "boolean"
-            },
-            "lastModifiedDateTime": {
-              "anyOf": [
-                {
-                  "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
-                  "format": "date-time",
-                  "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
-            },
-            "name": {
-              "description": "The attachment's file name.",
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "size": {
-              "description": "The length of the attachment in bytes.",
-              "maximum": 2147483647,
-              "minimum": -2147483648,
-              "type": "number"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "bccRecipients": {
-        "description": "The Bcc: recipients for the message.",
-        "items": {
-          "$ref": "#/$defs/def1"
-        },
-        "type": "array"
-      },
-      "body": {
-        "additionalProperties": true,
-        "properties": {
-          "content": {
-            "description": "The content of the item.",
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "contentType": {
-            "enum": [
-              "text",
-              "html"
-            ],
-            "type": "string"
-          }
-        },
-        "type": "object"
-      },
-      "bodyPreview": {
-        "description": "The first 255 characters of the message body. It is in text format.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "categories": {
-        "description": "The categories associated with the item",
-        "items": {
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "type": "array"
-      },
-      "ccRecipients": {
-        "description": "The Cc: recipients for the message.",
-        "items": {
-          "$ref": "#/$defs/def1"
-        },
-        "type": "array"
-      },
-      "changeKey": {
-        "description": "Identifies the version of the item. Every time the item is changed, changeKey changes as well. This allows Exchange to apply changes to the correct version of the object. Read-only.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "conversationId": {
-        "description": "The ID of the conversation the email belongs to.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "conversationIndex": {
-        "description": "Indicates the position of the message within the conversation.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "createdDateTime": {
-        "anyOf": [
-          {
-            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
-            "format": "date-time",
-            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
-      },
-      "flag": {
-        "additionalProperties": true,
-        "properties": {
-          "completedDateTime": {
-            "$ref": "#/$defs/def0"
-          },
-          "dueDateTime": {
-            "$ref": "#/$defs/def0"
-          },
-          "flagStatus": {
-            "enum": [
-              "notFlagged",
-              "complete",
-              "flagged"
-            ],
-            "type": "string"
-          },
-          "startDateTime": {
-            "$ref": "#/$defs/def0"
-          }
-        },
-        "type": "object"
-      },
-      "from": {
-        "$ref": "#/$defs/def1"
-      },
-      "hasAttachments": {
-        "description": "Indicates whether the message has attachments. This property doesn't include inline attachments, so if a message contains only inline attachments, this property is false. To verify the existence of inline attachments, parse the body property to look for a src attribute, such as <IMG src='cid:image001.jpg@01D26CD8.6C05F070'>.",
-        "type": [
-          "boolean",
-          "null"
-        ]
-      },
-      "id": {
-        "description": "The unique identifier for an entity. Read-only.",
-        "type": "string"
-      },
-      "importance": {
-        "enum": [
-          "low",
-          "normal",
-          "high"
-        ],
-        "type": "string"
-      },
-      "inferenceClassification": {
-        "enum": [
-          "focused",
-          "other"
-        ],
-        "type": "string"
-      },
-      "internetMessageHeaders": {
-        "description": "A collection of message headers defined by RFC5322. The set includes message headers indicating the network path taken by a message from the sender to the recipient. It can also contain custom message headers that hold app data for the message.  Requires $select to retrieve. Read-only.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "name": {
-              "description": "Represents the key in a key-value pair.",
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "value": {
-              "description": "The value in a key-value pair.",
-              "type": [
-                "string",
-                "null"
-              ]
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "internetMessageId": {
-        "description": "The message ID in the format specified by RFC2822.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "isDeliveryReceiptRequested": {
-        "description": "Indicates whether a read receipt is requested for the message.",
-        "type": [
-          "boolean",
-          "null"
-        ]
-      },
-      "isDraft": {
-        "description": "Indicates whether the message is a draft. A message is a draft if it hasn't been sent yet.",
-        "type": [
-          "boolean",
-          "null"
-        ]
-      },
-      "lastModifiedDateTime": {
-        "anyOf": [
-          {
-            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
-            "format": "date-time",
-            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
-      },
-      "multiValueExtendedProperties": {
-        "description": "The collection of multi-value extended properties defined for the message. Nullable.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "id": {
-              "description": "The unique identifier for an entity. Read-only.",
-              "type": "string"
-            },
-            "value": {
-              "description": "A collection of property values.",
-              "items": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "type": "array"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "singleValueExtendedProperties": {
-        "description": "The collection of single-value extended properties defined for the message. Nullable.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "id": {
-              "description": "The unique identifier for an entity. Read-only.",
-              "type": "string"
-            },
-            "value": {
-              "description": "A property value.",
-              "type": [
-                "string",
-                "null"
-              ]
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "subject": {
-        "description": "The subject of the message.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "toRecipients": {
-        "description": "The To: recipients for the message.",
-        "items": {
-          "$ref": "#/$defs/def1"
-        },
-        "type": "array"
-      }
-    },
-    "type": "object"
-  },
-  {
-    "additionalProperties": true,
-    "properties": {},
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "properties": {
+      "attachments": {
+        "description": "The fileAttachment and itemAttachment attachments for the message.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "contentType": {
+              "description": "The MIME type.",
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "id": {
+              "description": "The unique identifier for an entity. Read-only.",
+              "type": "string"
+            },
+            "isInline": {
+              "description": "true if the attachment is an inline attachment; otherwise, false.",
+              "type": "boolean"
+            },
+            "lastModifiedDateTime": {
+              "anyOf": [
+                {
+                  "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
+                  "format": "date-time",
+                  "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
+            },
+            "name": {
+              "description": "The attachment's file name.",
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "size": {
+              "description": "The length of the attachment in bytes.",
+              "maximum": 2147483647,
+              "minimum": -2147483648,
+              "type": "number"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "bccRecipients": {
+        "description": "The Bcc: recipients for the message.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "emailAddress": {
+              "additionalProperties": true,
+              "properties": {
+                "address": {
+                  "description": "The email address of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "name": {
+                  "description": "The display name of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "body": {
+        "additionalProperties": true,
+        "properties": {
+          "content": {
+            "description": "The content of the item.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "contentType": {
+            "enum": [
+              "text",
+              "html"
+            ],
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "bodyPreview": {
+        "description": "The first 255 characters of the message body. It is in text format.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "categories": {
+        "description": "The categories associated with the item",
+        "items": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "type": "array"
+      },
+      "ccRecipients": {
+        "description": "The Cc: recipients for the message.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "emailAddress": {
+              "additionalProperties": true,
+              "properties": {
+                "address": {
+                  "description": "The email address of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "name": {
+                  "description": "The display name of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "changeKey": {
+        "description": "Identifies the version of the item. Every time the item is changed, changeKey changes as well. This allows Exchange to apply changes to the correct version of the object. Read-only.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "conversationId": {
+        "description": "The ID of the conversation the email belongs to.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "conversationIndex": {
+        "description": "Indicates the position of the message within the conversation.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "createdDateTime": {
+        "anyOf": [
+          {
+            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
+            "format": "date-time",
+            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
+      },
+      "flag": {
+        "additionalProperties": true,
+        "properties": {
+          "completedDateTime": {
+            "additionalProperties": true,
+            "properties": {
+              "dateTime": {
+                "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
+                "type": "string"
+              },
+              "timeZone": {
+                "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          "dueDateTime": {
+            "additionalProperties": true,
+            "properties": {
+              "dateTime": {
+                "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
+                "type": "string"
+              },
+              "timeZone": {
+                "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          "flagStatus": {
+            "enum": [
+              "notFlagged",
+              "complete",
+              "flagged"
+            ],
+            "type": "string"
+          },
+          "startDateTime": {
+            "additionalProperties": true,
+            "properties": {
+              "dateTime": {
+                "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
+                "type": "string"
+              },
+              "timeZone": {
+                "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          }
+        },
+        "type": "object"
+      },
+      "from": {
+        "additionalProperties": true,
+        "properties": {
+          "emailAddress": {
+            "additionalProperties": true,
+            "properties": {
+              "address": {
+                "description": "The email address of the person or entity.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "name": {
+                "description": "The display name of the person or entity.",
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          }
+        },
+        "type": "object"
+      },
+      "hasAttachments": {
+        "description": "Indicates whether the message has attachments. This property doesn't include inline attachments, so if a message contains only inline attachments, this property is false. To verify the existence of inline attachments, parse the body property to look for a src attribute, such as <IMG src='cid:image001.jpg@01D26CD8.6C05F070'>.",
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "id": {
+        "description": "The unique identifier for an entity. Read-only.",
+        "type": "string"
+      },
+      "importance": {
+        "enum": [
+          "low",
+          "normal",
+          "high"
+        ],
+        "type": "string"
+      },
+      "inferenceClassification": {
+        "enum": [
+          "focused",
+          "other"
+        ],
+        "type": "string"
+      },
+      "internetMessageHeaders": {
+        "description": "A collection of message headers defined by RFC5322. The set includes message headers indicating the network path taken by a message from the sender to the recipient. It can also contain custom message headers that hold app data for the message.  Requires $select to retrieve. Read-only.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "name": {
+              "description": "Represents the key in a key-value pair.",
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "value": {
+              "description": "The value in a key-value pair.",
+              "type": [
+                "string",
+                "null"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "internetMessageId": {
+        "description": "The message ID in the format specified by RFC2822.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "isDeliveryReceiptRequested": {
+        "description": "Indicates whether a read receipt is requested for the message.",
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "isDraft": {
+        "description": "Indicates whether the message is a draft. A message is a draft if it hasn't been sent yet.",
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "lastModifiedDateTime": {
+        "anyOf": [
+          {
+            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
+            "format": "date-time",
+            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
+      },
+      "multiValueExtendedProperties": {
+        "description": "The collection of multi-value extended properties defined for the message. Nullable.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "id": {
+              "description": "The unique identifier for an entity. Read-only.",
+              "type": "string"
+            },
+            "value": {
+              "description": "A collection of property values.",
+              "items": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "type": "array"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "singleValueExtendedProperties": {
+        "description": "The collection of single-value extended properties defined for the message. Nullable.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "id": {
+              "description": "The unique identifier for an entity. Read-only.",
+              "type": "string"
+            },
+            "value": {
+              "description": "A property value.",
+              "type": [
+                "string",
+                "null"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "subject": {
+        "description": "The subject of the message.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "toRecipients": {
+        "description": "The To: recipients for the message.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "emailAddress": {
+              "additionalProperties": true,
+              "properties": {
+                "address": {
+                  "description": "The email address of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "name": {
+                  "description": "The display name of the person or entity.",
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "type": "object"
+  },
+  {
+    "additionalProperties": true,
+    "properties": {},
+    "type": "object"
+  }
+]

Changed3 schema fields changedv0.134.4Jul 28, 2026

addedInput schema / $defs

Added value: +{
+  "def0": {
+    "additionalProperties": true,
+    "properties": {
+      "dateTime": {
+        "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
+        "type": "string"
+      },
+      "timeZone": {
+        "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "type": "object"
+  },
+  "def1": {
+    "additionalProperties": true,
+    "properties": {
+      "emailAddress": {
+        "additionalProperties": true,
+        "properties": {
+          "address": {
+            "description": "The email address of the person or entity.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "name": {
+            "description": "The display name of the person or entity.",
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "type": "object"
+      }
+    },
+    "type": "object"
+  }
+}

changedInput schema / properties / body / properties / Message / anyOf

Previous value: -[
-  {
-    "additionalProperties": true,
-    "properties": {
-      "attachments": {
-        "description": "The fileAttachment and itemAttachment attachments for the message.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "contentType": {
-              "description": "The MIME type.",
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "id": {
-              "description": "The unique identifier for an entity. Read-only.",
-              "type": "string"
-            },
-            "isInline": {
-              "description": "true if the attachment is an inline attachment; otherwise, false.",
-              "type": "boolean"
-            },
-            "lastModifiedDateTime": {
-              "anyOf": [
-                {
-                  "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
-                  "format": "date-time",
-                  "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
-                  "type": "string"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
-            },
-            "name": {
-              "description": "The attachment's file name.",
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "size": {
-              "description": "The length of the attachment in bytes.",
-              "maximum": 2147483647,
-              "minimum": -2147483648,
-              "type": "number"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "bccRecipients": {
-        "description": "The Bcc: recipients for the message.",
-        "items": {
-          "$ref": "#/properties/body/properties/Message/anyOf/0/properties/from"
-        },
-        "type": "array"
-      },
-      "body": {
-        "additionalProperties": true,
-        "properties": {
-          "content": {
-            "description": "The content of the item.",
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "contentType": {
-            "enum": [
-              "text",
-              "html"
-            ],
-            "type": "string"
-          }
-        },
-        "type": "object"
-      },
-      "bodyPreview": {
-        "description": "The first 255 characters of the message body. It is in text format.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "categories": {
-        "description": "The categories associated with the item",
-        "items": {
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "type": "array"
-      },
-      "ccRecipients": {
-        "description": "The Cc: recipients for the message.",
-        "items": {
-          "$ref": "#/properties/body/properties/Message/anyOf/0/properties/from"
-        },
-        "type": "array"
-      },
-      "changeKey": {
-        "description": "Identifies the version of the item. Every time the item is changed, changeKey changes as well. This allows Exchange to apply changes to the correct version of the object. Read-only.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "conversationId": {
-        "description": "The ID of the conversation the email belongs to.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "conversationIndex": {
-        "description": "Indicates the position of the message within the conversation.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "createdDateTime": {
-        "anyOf": [
-          {
-            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
-            "format": "date-time",
-            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
-      },
-      "flag": {
-        "additionalProperties": true,
-        "properties": {
-          "completedDateTime": {
-            "additionalProperties": true,
-            "properties": {
-              "dateTime": {
-                "description": "A single point of time in a combined date and time representation ({date}T{time}; for example, 2017-08-29T04:00:00.0000000).",
-                "type": "string"
-              },
-              "timeZone": {
-                "description": "Represents a time zone, for example, 'Pacific Standard Time'. See below for more possible values.",
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "type": "object"
-          },
-          "dueDateTime": {
-            "$ref": "#/properties/body/properties/Message/anyOf/0/properties/flag/properties/completedDateTime"
-          },
-          "flagStatus": {
-            "enum": [
-              "notFlagged",
-              "complete",
-              "flagged"
-            ],
-            "type": "string"
-          },
-          "startDateTime": {
-            "$ref": "#/properties/body/properties/Message/anyOf/0/properties/flag/properties/completedDateTime"
-          }
-        },
-        "type": "object"
-      },
-      "from": {
-        "additionalProperties": true,
-        "properties": {
-          "emailAddress": {
-            "additionalProperties": true,
-            "properties": {
-              "address": {
-                "description": "The email address of the person or entity.",
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "name": {
-                "description": "The display name of the person or entity.",
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "type": "object"
-          }
-        },
-        "type": "object"
-      },
-      "hasAttachments": {
-        "description": "Indicates whether the message has attachments. This property doesn't include inline attachments, so if a message contains only inline attachments, this property is false. To verify the existence of inline attachments, parse the body property to look for a src attribute, such as <IMG src='cid:image001.jpg@01D26CD8.6C05F070'>.",
-        "type": [
-          "boolean",
-          "null"
-        ]
-      },
-      "id": {
-        "description": "The unique identifier for an entity. Read-only.",
-        "type": "string"
-      },
-      "importance": {
-        "enum": [
-          "low",
-          "normal",
-          "high"
-        ],
-        "type": "string"
-      },
-      "inferenceClassification": {
-        "enum": [
-          "focused",
-          "other"
-        ],
-        "type": "string"
-      },
-      "internetMessageHeaders": {
-        "description": "A collection of message headers defined by RFC5322. The set includes message headers indicating the network path taken by a message from the sender to the recipient. It can also contain custom message headers that hold app data for the message.  Requires $select to retrieve. Read-only.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "name": {
-              "description": "Represents the key in a key-value pair.",
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "value": {
-              "description": "The value in a key-value pair.",
-              "type": [
-                "string",
-                "null"
-              ]
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "internetMessageId": {
-        "description": "The message ID in the format specified by RFC2822.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "isDeliveryReceiptRequested": {
-        "description": "Indicates whether a read receipt is requested for the message.",
-        "type": [
-          "boolean",
-          "null"
-        ]
-      },
-      "isDraft": {
-        "description": "Indicates whether the message is a draft. A message is a draft if it hasn't been sent yet.",
-        "type": [
-          "boolean",
-          "null"
-        ]
-      },
-      "lastModifiedDateTime": {
-        "anyOf": [
-          {
-            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
-            "format": "date-time",
-            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
-      },
-      "multiValueExtendedProperties": {
-        "description": "The collection of multi-value extended properties defined for the message. Nullable.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "id": {
-              "description": "The unique identifier for an entity. Read-only.",
-              "type": "string"
-            },
-            "value": {
-              "description": "A collection of property values.",
-              "items": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "type": "array"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "singleValueExtendedProperties": {
-        "description": "The collection of single-value extended properties defined for the message. Nullable.",
-        "items": {
-          "additionalProperties": true,
-          "properties": {
-            "id": {
-              "description": "The unique identifier for an entity. Read-only.",
-              "type": "string"
-            },
-            "value": {
-              "description": "A property value.",
-              "type": [
-                "string",
-                "null"
-              ]
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "subject": {
-        "description": "The subject of the message.",
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "toRecipients": {
-        "description": "The To: recipients for the message.",
-        "items": {
-          "$ref": "#/properties/body/properties/Message/anyOf/0/properties/from"
-        },
-        "type": "array"
-      }
-    },
-    "type": "object"
-  },
-  {
-    "additionalProperties": true,
-    "properties": {},
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "properties": {
+      "attachments": {
+        "description": "The fileAttachment and itemAttachment attachments for the message.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "contentType": {
+              "description": "The MIME type.",
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "id": {
+              "description": "The unique identifier for an entity. Read-only.",
+              "type": "string"
+            },
+            "isInline": {
+              "description": "true if the attachment is an inline attachment; otherwise, false.",
+              "type": "boolean"
+            },
+            "lastModifiedDateTime": {
+              "anyOf": [
+                {
+                  "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
+                  "format": "date-time",
+                  "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
+            },
+            "name": {
+              "description": "The attachment's file name.",
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "size": {
+              "description": "The length of the attachment in bytes.",
+              "maximum": 2147483647,
+              "minimum": -2147483648,
+              "type": "number"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "bccRecipients": {
+        "description": "The Bcc: recipients for the message.",
+        "items": {
+          "$ref": "#/$defs/def1"
+        },
+        "type": "array"
+      },
+      "body": {
+        "additionalProperties": true,
+        "properties": {
+          "content": {
+            "description": "The content of the item.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "contentType": {
+            "enum": [
+              "text",
+              "html"
+            ],
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "bodyPreview": {
+        "description": "The first 255 characters of the message body. It is in text format.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "categories": {
+        "description": "The categories associated with the item",
+        "items": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "type": "array"
+      },
+      "ccRecipients": {
+        "description": "The Cc: recipients for the message.",
+        "items": {
+          "$ref": "#/$defs/def1"
+        },
+        "type": "array"
+      },
+      "changeKey": {
+        "description": "Identifies the version of the item. Every time the item is changed, changeKey changes as well. This allows Exchange to apply changes to the correct version of the object. Read-only.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "conversationId": {
+        "description": "The ID of the conversation the email belongs to.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "conversationIndex": {
+        "description": "Indicates the position of the message within the conversation.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "createdDateTime": {
+        "anyOf": [
+          {
+            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
+            "format": "date-time",
+            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
+      },
+      "flag": {
+        "additionalProperties": true,
+        "properties": {
+          "completedDateTime": {
+            "$ref": "#/$defs/def0"
+          },
+          "dueDateTime": {
+            "$ref": "#/$defs/def0"
+          },
+          "flagStatus": {
+            "enum": [
+              "notFlagged",
+              "complete",
+              "flagged"
+            ],
+            "type": "string"
+          },
+          "startDateTime": {
+            "$ref": "#/$defs/def0"
+          }
+        },
+        "type": "object"
+      },
+      "from": {
+        "$ref": "#/$defs/def1"
+      },
+      "hasAttachments": {
+        "description": "Indicates whether the message has attachments. This property doesn't include inline attachments, so if a message contains only inline attachments, this property is false. To verify the existence of inline attachments, parse the body property to look for a src attribute, such as <IMG src='cid:image001.jpg@01D26CD8.6C05F070'>.",
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "id": {
+        "description": "The unique identifier for an entity. Read-only.",
+        "type": "string"
+      },
+      "importance": {
+        "enum": [
+          "low",
+          "normal",
+          "high"
+        ],
+        "type": "string"
+      },
+      "inferenceClassification": {
+        "enum": [
+          "focused",
+          "other"
+        ],
+        "type": "string"
+      },
+      "internetMessageHeaders": {
+        "description": "A collection of message headers defined by RFC5322. The set includes message headers indicating the network path taken by a message from the sender to the recipient. It can also contain custom message headers that hold app data for the message.  Requires $select to retrieve. Read-only.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "name": {
+              "description": "Represents the key in a key-value pair.",
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "value": {
+              "description": "The value in a key-value pair.",
+              "type": [
+                "string",
+                "null"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "internetMessageId": {
+        "description": "The message ID in the format specified by RFC2822.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "isDeliveryReceiptRequested": {
+        "description": "Indicates whether a read receipt is requested for the message.",
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "isDraft": {
+        "description": "Indicates whether the message is a draft. A message is a draft if it hasn't been sent yet.",
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "lastModifiedDateTime": {
+        "anyOf": [
+          {
+            "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z",
+            "format": "date-time",
+            "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z"
+      },
+      "multiValueExtendedProperties": {
+        "description": "The collection of multi-value extended properties defined for the message. Nullable.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "id": {
+              "description": "The unique identifier for an entity. Read-only.",
+              "type": "string"
+            },
+            "value": {
+              "description": "A collection of property values.",
+              "items": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "type": "array"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "singleValueExtendedProperties": {
+        "description": "The collection of single-value extended properties defined for the message. Nullable.",
+        "items": {
+          "additionalProperties": true,
+          "properties": {
+            "id": {
+              "description": "The unique identifier for an entity. Read-only.",
+              "type": "string"
+            },
+            "value": {
+              "description": "A property value.",
+              "type": [
+                "string",
+                "null"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "subject": {
+        "description": "The subject of the message.",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "toRecipients": {
+        "description": "The To: recipients for the message.",
+        "items": {
+          "$ref": "#/$defs/def1"
+        },
+        "type": "array"
+      }
+    },
+    "type": "object"
+  },
+  {
+    "additionalProperties": true,
+    "properties": {},
+    "type": "object"
+  }
+]

changedInput schema / properties / messageId / description

Previous value: -"Path parameter: messageId"New value: +"Value for the 'messageId' path segment. Pass it under the name 'messageId', not as 'id'. Use the 'id' field of the message object as returned by Microsoft Graph."

Changed1 schema field changedv0.131.2Jul 18, 2026
- changedInput schema / additionalProperties
```
Previous value: -falseNew value: +true
```

Changed1 schema field changedv0.131.1Jul 11, 2026

addedInput schema / properties / confirm

Added value: +{
+  "description": "For destructive operations when the confirm gate is enabled (MS365_MCP_REQUIRE_CONFIRM=true; off by default). Set to true only after the user has explicitly approved this action. When the gate is on, calls without confirm: true return { error: \"confirmation_required\" } without touching user data.",
+  "type": "boolean"
+}

Addedv0.114.0May 28, 2026
Removedv0.112.2May 22, 2026
Addedv0.110.0May 18, 2026
Removedv0.108.0May 15, 2026
Addedv0.96.0May 4, 2026

TDQS

A4.7/5.0

Behavior5/5

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

Annotations already flag destructiveHint=true and openWorldHint=true, but the description adds critical behavior beyond them: the comment/body mutual exclusion returning HTTP 400, that Message.body replaces and discards the quoted history, that signatures are only added client-side, and the RFC 2822 replyTo routing rule. This is exactly the extra context an agent needs before mutating a draft.

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?

Purpose is front-loaded, then organized into JSON/MIME bullet branches, with the TIP consolidating HTML and body-replacement caveats. It is slightly long and repeats the 400-on-both-fields rule twice, but every section carries actionable content.

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?

For a mutation tool with nested params and no output schema, the description covers format choice, encoding, attachment/S-MIME handling, and body-replacement caveats. It omits required Graph scopes and the shape of the returned draft, minor gaps for a tool whose schema already documents confirm and response flags.

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 description coverage is 80% (baseline 3), and the description adds real meaning on top: the comment-vs-body exclusivity, base64 header/content requirements for MIME, and the replyTo recipient semantics. It stops short of explaining confirm/includeHeaders/excludeResponse, which are left to their schema descriptions.

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 and resource ('Create a draft to reply to the sender and all recipients of a message') that immediately distinguishes it from create-reply-draft (reply only) and reply-all-mail-message (single-action send). The draft-vs-send scope is explicit.

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

Usage Guidelines5/5

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

Gives explicit when-to-use conditions plus the alternative path: 'Send the draft message in a subsequent operation. Alternatively, reply-all to a message in a single action.' It also spells out the JSON vs MIME decision points, so the agent knows which format branch and which sibling to route to.

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

Deploy Server

create-reply-all-draft

Instructions

Input Schema

Schema Changelog

TDQS

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