ChatMessage

Who authored the message

Attached artifact (e.g. a Cohost-generated HTML page), when present

File attachments (images, documents, audio, video)

Inline card rendered within the message (e.g. a Cohost info card), when present

The conversation this message belongs to

Link-preview metadata when the message contains a link

ID of the object.

When the most recent reply was sent, or null when the message has no replies

Emoji reaction counts grouped by base emoji (skin-tone modifiers are stripped server-side).

Number of replies in the thread rooted at this message

Parent message (null for root messages)

Resource ID for this object, for interop with the Admin API.

HTML content; internal classes and attributes are stripped on external API surfaces

Plain text content with HTML stripped

Title of the thread rooted at this message, or null when the message has no thread

The member who sent the message; null when the author no longer resolves