# properties.text.description
The message for the agent — it reads this as the incoming email body and decides what to do.

# properties.subject.description
Optional subject line the agent sees on the message.

# properties.from.description
Optional sender address the agent sees as the originator. Defaults to the account's API caller address.

# properties.html.description
Optional HTML body. `text` is still required — the agent reasons over the plain-text content.

# properties.routeId.description
Target a specific agent by its route id (rte_…). Omit to use the account's default agent (its most recently created agent route).

# properties.address.description
Target the agent whose route matches this address. Alternative to routeId.

# properties.model.description
Override the model the agent runs on for this call (e.g. claude-sonnet-4-6).