aether_core/events/
agent_event.rs

1use schemars::JsonSchema;
2use serde::{Deserialize, Serialize};
3
4use super::{ContextEvent, MessageEvent, ModelEvent, ToolEvent, TurnEvent, TurnOutcome};
5
6/// A canonical event on the agent's output stream.
7#[derive(Debug, Clone, PartialEq, Serialize, Deserialize, JsonSchema)]
8#[serde(tag = "category", content = "event", rename_all = "snake_case")]
9pub enum AgentEvent {
10    Message(MessageEvent),
11    Tool(ToolEvent),
12    Turn(TurnEvent),
13    Context(ContextEvent),
14    Model(ModelEvent),
15}
16
17impl AgentEvent {
18    pub fn text(message_id: &str, chunk: &str, is_complete: bool) -> Self {
19        Self::Message(MessageEvent::Text { message_id: message_id.into(), chunk: chunk.into(), is_complete })
20    }
21
22    pub fn thought(message_id: &str, chunk: &str, is_complete: bool) -> Self {
23        Self::Message(MessageEvent::Thought { message_id: message_id.into(), chunk: chunk.into(), is_complete })
24    }
25
26    pub fn turn_ended(outcome: TurnOutcome) -> Self {
27        Self::Turn(TurnEvent::Ended { outcome })
28    }
29
30    /// The turn's terminal outcome, if this event ends a turn.
31    pub fn turn_outcome(&self) -> Option<&TurnOutcome> {
32        match self {
33            Self::Turn(TurnEvent::Ended { outcome }) => Some(outcome),
34            _ => None,
35        }
36    }
37}
38
39#[cfg(test)]
40mod tests {
41    use super::*;
42    use crate::events::{ContextUsage, LlmCallOutcome, LlmCallPurpose};
43
44    #[test]
45    fn serializes_nested_event_contract() {
46        let event = AgentEvent::text("m1", "hello", true);
47        assert_eq!(
48            serde_json::to_value(event).unwrap(),
49            serde_json::json!({"category":"message","event":{"type":"text","message_id":"m1","chunk":"hello","is_complete":true}})
50        );
51    }
52
53    #[test]
54    fn nested_events_roundtrip() {
55        let events = [
56            AgentEvent::text("m", "text", true),
57            AgentEvent::Tool(ToolEvent::DefinitionsUpdated { tools: vec![] }),
58            AgentEvent::Turn(TurnEvent::LlmCallEnded {
59                purpose: LlmCallPurpose::Chat,
60                outcome: LlmCallOutcome::Cancelled,
61            }),
62            AgentEvent::Context(ContextEvent::UsageUpdated { usage: ContextUsage::default() }),
63            AgentEvent::Model(ModelEvent::Switched { previous: "a".into(), new: "b".into() }),
64        ];
65        for event in events {
66            let json = serde_json::to_string(&event).unwrap();
67            assert_eq!(serde_json::from_str::<AgentEvent>(&json).unwrap(), event);
68        }
69    }
70
71    #[test]
72    fn turn_outcome_returns_outcome_only_for_turn_end() {
73        assert_eq!(AgentEvent::turn_ended(TurnOutcome::Completed).turn_outcome(), Some(&TurnOutcome::Completed));
74        assert_eq!(AgentEvent::text("m", "text", true).turn_outcome(), None);
75        assert_eq!(AgentEvent::Turn(TurnEvent::Started { content: vec![] }).turn_outcome(), None);
76    }
77}
aether_core/events/agent_event.rs

aether_core/events/
agent_event.rs
