exec_events: rename SessionCreatedEvent to CollaborationStartedEvent and update event name

- Changed ConversationEvent variant from SessionCreated to CollaborationStarted and updated serde rename from "session.created" to "collaboration.started"
- Renamed SessionCreatedEvent struct to CollaborationStartedEvent throughout codebase and tests
- Updated event processor and tests to use new variant and struct

codex-rs/exec/src/exec_events.rs

@@ -6,8 +6,8 @@ use ts_rs::TS;
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, TS)]
 #[serde(tag = "type")]
 pub enum ConversationEvent {
-    #[serde(rename = "session.created")]
-    SessionCreated(SessionCreatedEvent),
+    #[serde(rename = "collaboration.started")]
+    CollaborationStarted(CollaborationStartedEvent),
     #[serde(rename = "turn.started")]
     TurnStarted(TurnStartedEvent),
     #[serde(rename = "turn.completed")]
@@ -23,7 +23,7 @@ pub enum ConversationEvent {
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, TS)]
-pub struct SessionCreatedEvent {
+pub struct CollaborationStartedEvent {
     pub session_id: String,
 }
 

codex-rs/exec/src/experimental_event_processor_with_json_output.rs

@@ -6,6 +6,7 @@ use crate::event_processor::CodexStatus;
 use crate::event_processor::EventProcessor;
 use crate::event_processor::handle_last_message;
 use crate::exec_events::AssistantMessageItem;
+use crate::exec_events::CollaborationStartedEvent;
 use crate::exec_events::CommandExecutionItem;
 use crate::exec_events::CommandExecutionStatus;
 use crate::exec_events::ConversationErrorEvent;
@@ -20,7 +21,6 @@ use crate::exec_events::ItemUpdatedEvent;
 use crate::exec_events::PatchApplyStatus;
 use crate::exec_events::PatchChangeKind;
 use crate::exec_events::ReasoningItem;
-use crate::exec_events::SessionCreatedEvent;
 use crate::exec_events::TodoItem;
 use crate::exec_events::TodoListItem;
 use crate::exec_events::TurnCompletedEvent;
@@ -119,9 +119,11 @@ impl ExperimentalEventProcessorWithJsonOutput {
         &self,
         payload: &SessionConfiguredEvent,
     ) -> Vec<ConversationEvent> {
-        vec![ConversationEvent::SessionCreated(SessionCreatedEvent {
-            session_id: payload.session_id.to_string(),
-        })]
+        vec![ConversationEvent::CollaborationStarted(
+            CollaborationStartedEvent {
+                session_id: payload.session_id.to_string(),
+            },
+        )]
     }
 
     fn handle_agent_message(&self, payload: &AgentMessageEvent) -> Vec<ConversationEvent> {

codex-rs/exec/tests/event_processor_with_json_output.rs

@@ -9,6 +9,7 @@ use codex_core::protocol::PatchApplyBeginEvent;
 use codex_core::protocol::PatchApplyEndEvent;
 use codex_core::protocol::SessionConfiguredEvent;
 use codex_exec::exec_events::AssistantMessageItem;
+use codex_exec::exec_events::CollaborationStartedEvent;
 use codex_exec::exec_events::CommandExecutionItem;
 use codex_exec::exec_events::CommandExecutionStatus;
 use codex_exec::exec_events::ConversationErrorEvent;
@@ -21,7 +22,6 @@ use codex_exec::exec_events::ItemUpdatedEvent;
 use codex_exec::exec_events::PatchApplyStatus;
 use codex_exec::exec_events::PatchChangeKind;
 use codex_exec::exec_events::ReasoningItem;
-use codex_exec::exec_events::SessionCreatedEvent;
 use codex_exec::exec_events::TodoItem as ExecTodoItem;
 use codex_exec::exec_events::TodoListItem as ExecTodoListItem;
 use codex_exec::exec_events::TurnCompletedEvent;
@@ -62,9 +62,11 @@ fn session_configured_produces_session_created_event() {
     let out = ep.collect_conversation_events(&ev);
     assert_eq!(
         out,
-        vec![ConversationEvent::SessionCreated(SessionCreatedEvent {
-            session_id: "67e55044-10b1-426f-9247-bb680e5fe0c8".to_string(),
-        })]
+        vec![ConversationEvent::CollaborationStarted(
+            CollaborationStartedEvent {
+                session_id: "67e55044-10b1-426f-9247-bb680e5fe0c8".to_string(),
+            }
+        )]
     );
 }