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Softeria

Microsoft 365 MCP Server

by Softeria

reply-mail-message

reply-mail-message
Destructive

Send a reply to an email's sender in JSON or MIME format, preserving HTML formatting and attachments, or save it as a draft to send later.

Instructions

Reply to the sender of a message using 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), send the reply to the recipients in replyTo and not the recipient in the from property. 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. This method saves the message in the Sent Items folder. Alternatively, create a draft to reply to an existing message and send it later.

💡 TIP: Reply to an email preserving full HTML formatting. The 'comment' field is your reply text. Do NOT reconstruct the email manually.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bodyYes
confirmNoFor 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.
messageIdYesValue 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.
includeHeadersNoInclude response headers (including ETag) in the response metadata
excludeResponseNoExclude the full response body and only return success or failure indication

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changedv0.145.2
    • 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"
      +  }
      +]
  2. Changed3 schema fields changedv0.134.4
    • 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."
  3. Changed1 schema field changedv0.131.2
    • changedInput schema / additionalProperties
      Previous value: -falseNew value: +true
  4. Changed1 schema field changedv0.131.1
    • 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"
      +}
  5. Addedv0.114.0
  6. Removedv0.112.2
  7. Addedv0.110.0
  8. Removedv0.108.0
  9. Addedv0.96.0

TDQS

A4.4/5.0
Behavior4/5

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

Annotations already flag destructiveHint=true, and the description confirms the side effect by noting it 'saves the message in the Sent Items folder' and sends a reply. It also discloses the replyTo precedence rule and the HTTP 400 error condition, adding valuable behavioral context beyond the annotations.

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 well-organized with bullets and sections, front-loading the main purpose. Each sentence carries information; the tip at the end is practical though slightly tangential. It could be tightened, but the structure helps readability.

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 complex mail-reply operation with two formats, multiple constraints, and an alternative workflow, the description covers all key aspects: format selection, parameter constraints, replyTo behavior, save location, draft alternative, and a practical tip. It is complete enough for an agent to invoke the 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?

With 80% schema coverage, the schema already documents most parameters. The description adds essential semantics by explaining the mutual exclusivity of 'Comment' and 'body' in JSON mode, and by detailing the base64-encoded MIME format requirement—details not present in the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Reply to the sender of a message') and specifies the two output formats (JSON and MIME). It distinguishes itself from the related create-reply-draft tool by explicitly presenting the draft alternative, making the tool's unique role apparent.

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

Usage Guidelines4/5

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

It gives explicit guidance on when to use JSON vs MIME, the constraint of comment vs body, and replyTo handling. It mentions the alternative of creating a draft, but doesn't explicitly compare to reply-all-mail-message or forward-mail-message, leaving some ambiguity about recipient-scope differences.

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

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