Release notes

Channels in the Conversations API now carry a capabilities field that declares what the channel’s surface can render, and the AI Agent tailors its replies to match. markdown is the first capability: a channel that opts in receives replies written with bold, italics, and inline links instead of plain prose.

Capabilities are disabled by default, so existing channels are unaffected until they opt in. Set capabilities when creating a channel with POST /v2/channels, or change it on an existing channel with the new PATCH /v2/channels/{channel_id} endpoint. Native channels expose capabilities as read-only, derived from their surface.

Enable markdown only if your channel’s UI renders it; otherwise end users see the raw syntax. For setup steps, example payloads, and rendering guidance, see Creating a custom channel.