Microsoft 365 MCP Server

create-reply-draft

create-reply-draft

Destructive

Create a draft reply to the sender of a Microsoft 365 message in JSON or MIME format, so you can edit and send it later.

Instructions

Create a draft to reply to the sender 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 replyTo is specified in the original message, per Internet Message Format (RFC 2822), you should send the reply to the recipients in replyTo, and not the recipients in from.
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 to a message in a single operation.

💡 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

TableJSON 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.

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

A4.4/5.0

Behavior5/5

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

The description goes well beyond the annotations (readOnlyHint: false, destructiveHint: true) by detailing key behaviors: the 400 error when both comment and body are supplied, the note that supplying body replaces the entire draft body so quoted history is lost, the MIME base64 requirement, and that signatures are only added by the Outlook client, not via Graph. These are valuable, non-obvious details that help an agent predict behavior accurately.

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

Conciseness4/5

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

The description is relatively long but well-structured with bullet points and clear formatting. It leads with the primary purpose, then details each format, and provides a tip and note. Despite its length, every sentence conveys necessary information; it is appropriately detailed for a complex tool with two distinct input formats.

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

Completeness5/5

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

For a tool with two complex input formats, nested schemas, and error-prone conditions, the description is extremely complete. It covers format selection, header requirements, attachments, error cases, update workflow, and the alternative single-operation reply. No output schema is needed, and the description leaves no obvious gaps for an agent to call this tool correctly.

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?

While schema coverage is high (80%), the description adds meaningful semantics for the body parameter (explaining the Comment vs Message distinction and the error condition) and for messageId (instructing to pass it as 'messageId' not 'id'). It also clarifies that attachments and S/MIME properties go into the MIME content. This adds value beyond the schema's basic property 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?

The description clearly states the tool's purpose: 'Create a draft to reply to the sender of a message in either JSON or MIME format.' It specifies the verb, resource, and formats, and distinguishes itself from siblings like create-forward-draft and create-reply-all-draft by its focus on replying to the sender only. The mention of 'Alternatively, reply to a message in a single operation' further clarifies its scope.

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

Usage Guidelines3/5

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

The description implies when to use this tool: when you want to create a draft rather than send immediately ('Send the draft message in a subsequent operation'), and it mentions the alternative of replying in a single operation. However, it does not explicitly name any sibling tools (e.g., create-reply-all-draft, reply-mail-message) or provide clear exclusions, so the guidance is implied but not explicit.

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-draft

Instructions

Input Schema

Schema Changelog

TDQS

Other Tools