Struct Notification 

pub struct Notification {
    pub tool_use_id: String,
    pub task_id: String,
    pub result: String,
    pub tokens: Option<u64>,
    pub duration_ms: Option<u64>,
}

One completed entry of a task notification.

Fields

tool_use_id: String

<tool-use-id>: the launch, or the SendMessage that resumed it.

task_id: String

<task-id>: the agent’s id; empty when the notification has none.

result: String

The <result> text (the whole chunk when it carries none).

tokens: Option<u64>

<subagent_tokens> of the <usage> block, when it has one.

duration_ms: Option<u64>

<duration_ms> of the <usage> block, when it has one.