Send Gmail Message

Previous value: -"Optional RFC Message-ID of the message being replied to (e.g., '<message123@gmail.com>')."New value: +"Optional RFC Message-ID to explicitly reply to a specific message (e.g., '<message123@gmail.com>'). Omit to reply to the latest eligible message in thread_id."

Previous value: -"Optional chain of Message-IDs for proper threading."New value: +"Optional Message-ID ancestry chain. Normally omit when thread_id is provided; the server derives the chain through the selected reply target."

Previous value: -"Optional Gmail thread ID to reply within."New value: +"Optional Gmail thread ID to reply within. When in_reply_to is omitted, replies to the latest non-draft, non-trash message with an RFC Message-ID."

Added value: +{
+  "default": false,
+  "description": "Whether to include the message being replied to as a quoted original. Only has an effect when thread_id is provided. Defaults to false.",
+  "type": "boolean"
+}

Added value: +{
+  "default": false,
+  "description": "Whether to derive reply-all recipients from the thread: To = the sender being replied to, Cc = the other participants, excluding the authenticated account and from_email. Requires thread_id. Explicit to/cc win; when cc is omitted the sender being replied to is added to the derived Cc if they are not already in To. Defaults to false.",
+  "type": "boolean"
+}

Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

Added value: +null

Previous value: -"Recipient email address."New value: +"Recipient email address. Optional when replying with reply_all=True, which derives it from the thread."

Removed value: -"string"

Previous value: -[
-  "user_google_email",
-  "to"
-]New value: +[
+  "user_google_email"
+]

Added value: +false

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "additionalProperties": true,
+        "type": "object"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Optional list of attachments. Each can have: \"url\" (fetch from URL — works with MCP attachment URLs from get_drive_file_download_url / get_gmail_attachment_content), OR \"path\" (file path, auto-encodes), OR \"content\" (standard base64, not urlsafe) + \"filename\". Optional \"mime_type\". Optional \"content_id\" (string) makes the attachment inline-rendered: it lands in a multipart/related part with `Content-ID: <content_id>` and `Content-Disposition: inline`, and the HTML body can reference it via `<img src=\"cid:<content_id>\">` (RFC 2392). Without `content_id` the attachment is a regular multipart/mixed attachment. Example: [{\"url\": \"https://host/attachments/abc-123\", \"filename\": \"report.pdf\"}]"
+}

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Optional BCC email address."
+}

Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

Added value: +null

Previous value: -"Email body (plain text)."New value: +"Email body content (plain text or HTML). Required when sending. When forwarding, this is an optional note prepended above the quoted original."

Removed value: -"Body"

Removed value: -"string"

Added value: +{
+  "default": "plain",
+  "description": "Format of the body content (and of the prepended note when forwarding). Use 'plain' for plaintext or 'html' for HTML content.",
+  "enum": [
+    "plain",
+    "html"
+  ],
+  "type": "string"
+}

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Optional CC email address."
+}

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Set to a Gmail message ID to forward that message instead of composing a new one. The original subject, body, and (optionally) attachments are carried over; 'body' becomes an optional note prepended to the forward."
+}

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Optional 'Send As' alias email address. Must be configured in Gmail settings (Settings > Accounts > Send mail as). If not provided, uses the authenticated user's email."
+}

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Optional sender display name (e.g., 'Peter Hartree'). If provided, the From header will be formatted as 'Name <email>'."
+}

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Optional RFC Message-ID of the message being replied to (e.g., '<message123@gmail.com>')."
+}

Added value: +{
+  "default": true,
+  "description": "When forwarding, whether to include the original message's attachments. Ignored unless forward_message_id is set.",
+  "type": "boolean"
+}

Added value: +{
+  "default": true,
+  "description": "Whether to append the Gmail signature from Settings > Signature when available. Defaults to true.",
+  "type": "boolean"
+}

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Optional chain of Message-IDs for proper threading."
+}

Removed value: -{
-  "title": "service",
-  "type": "string"
-}

Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

Added value: +null

Previous value: -"Email subject."New value: +"Email subject. Required when sending; optional when forwarding (defaults to 'Fwd: <original subject>')."

Removed value: -"Subject"

Removed value: -"string"

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Optional Gmail thread ID to reply within."
+}

Removed value: -"To"

Added value: +"The user's Google email address. Required for authentication."

Removed value: -"User Google Email"

Previous value: -[
-  "service",
-  "user_google_email",
-  "to",
-  "subject",
-  "body"
-]New value: +[
+  "user_google_email",
+  "to"
+]

Removed value: -"send_gmail_messageArguments"

Previous value: -nullNew value: +{
+  "properties": {
+    "result": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "result"
+  ],
+  "type": "object",
+  "x-fastmcp-wrap-result": true
+}