Covers Engine 2.0.0

rapid/channels/{channel_name}

Streams the latest data for a channel requested by at least one connected client.

Category: Channels
Direction: Server → clients

Delivery

Published after a subscribed channel changes, batched to at most 20 Hz. TEMPEST sends from its committed RAPID telemetry snapshot; it does not query live channel slots from this loop. Unchanged snapshots are not reserialized or resent.

Payload

Field	Type	Presence	Description
`channel_name`	`string`	Always	Subscribed flat channel name; also replaces `{channel_name}` in the topic.
`exists`	`boolean`	Always	Whether the channel currently exists.
`channel_data`	`ChannelData`	Always	Current hot value/provenance fields plus sparse metadata, recording, authority, calculation links, and value options.