SendEmail

Draft, compose, and send an email. ALWAYS use this tool whenever the user asks you to draft, write, compose, or send an email (or reply to one) — never write the email as plain text in the chat. This tool opens the email draft in the composer for the user to review, edit, and confirm before it is sent, so it is the correct tool even when the user only wants a draft. To reply to an existing message, provide the replying_to_id. Write the body in Markdown — use bold, italics, lists, links, and other standard Markdown formatting. The draft composer renders the Markdown for the user to review and edit; the composer produces HTML that is sent as the actual email body.

Parameters

Parameter	Type	Required	Description
subject	string	Yes	The subject line of the email.
body	string	Yes	The body of the email. Written as Markdown by the AI and rendered in the draft composer. At send time the frontend replaces this with the base64url-encoded HTML produced by the composer, which is what gets sent to recipients.
to	EmailRecipient[]	Yes	The primary recipients (To field).
cc	EmailRecipient[]	No	Carbon copy recipients (optional).
bcc	EmailRecipient[]	No	Blind carbon copy recipients (optional).
replyingToId	string	No	The ID of a message to reply to (optional). When set, the email is sent as a reply within the same thread.
includeSignature	boolean	No	Per-message signature override, set by the composer's signature preview — not normally by you. Omit to use the inbox's default policy (always on a new email; on replies/forwards only when the user enabled it). false excludes the signature for this one email.