Restore phase when loading from history (#12244)

codex-rs/protocol/src/items.rs

@@ -190,13 +190,12 @@ impl AgentMessageItem {
     }
 
     pub fn as_legacy_events(&self) -> Vec<EventMsg> {
-        // Legacy events only preserve visible assistant text; `phase` has no
-        // representation in the v1 event stream.
         self.content
             .iter()
             .map(|c| match c {
                 AgentMessageContent::Text { text } => EventMsg::AgentMessage(AgentMessageEvent {
                     message: text.clone(),
+                    phase: self.phase.clone(),
                 }),
             })
             .collect()

codex-rs/protocol/src/protocol.rs

@@ -32,6 +32,7 @@ use crate::mcp::Tool as McpTool;
 use crate::message_history::HistoryEntry;
 use crate::models::BaseInstructions;
 use crate::models::ContentItem;
+use crate::models::MessagePhase;
 use crate::models::ResponseItem;
 use crate::models::WebSearchAction;
 use crate::num_format::format_with_separators;
@@ -1580,6 +1581,8 @@ impl fmt::Display for FinalOutput {
 #[derive(Debug, Clone, Deserialize, Serialize, JsonSchema, TS)]
 pub struct AgentMessageEvent {
     pub message: String,
+    #[serde(default)]
+    pub phase: Option<MessagePhase>,
 }
 
 #[derive(Debug, Clone, Deserialize, Serialize, JsonSchema, TS)]