diff --git a/codex-rs/core/src/session/turn_context.rs b/codex-rs/core/src/session/turn_context.rs
index 5f99cc5489..559686c912 100644
--- a/codex-rs/core/src/session/turn_context.rs
+++ b/codex-rs/core/src/session/turn_context.rs
@@ -381,6 +381,7 @@ impl TurnContext {
             collaboration_mode: Some(self.collaboration_mode.clone()),
             realtime_active: Some(self.realtime_active),
             effort: self.reasoning_effort,
+            summary: self.reasoning_summary,
         }
     }
 
diff --git a/codex-rs/core/tests/suite/resume_warning.rs b/codex-rs/core/tests/suite/resume_warning.rs
index cb545df351..d636a35cba 100644
--- a/codex-rs/core/tests/suite/resume_warning.rs
+++ b/codex-rs/core/tests/suite/resume_warning.rs
@@ -27,7 +27,6 @@ fn resume_history(
     let turn_id = "resume-warning-seed-turn".to_string();
     let turn_ctx = TurnContextItem {
         turn_id: Some(turn_id.clone()),
-        trace_id: None,
         cwd: config.cwd.to_path_buf(),
         current_date: None,
         timezone: None,
@@ -44,10 +43,6 @@ fn resume_history(
         summary: config
             .model_reasoning_summary
             .unwrap_or(ReasoningSummary::Auto),
-        user_instructions: None,
-        developer_instructions: None,
-        final_output_json_schema: None,
-        truncation_policy: None,
     };
 
     InitialHistory::Resumed(ResumedHistory {
diff --git a/codex-rs/protocol/src/protocol.rs b/codex-rs/protocol/src/protocol.rs
index 10c8c2620c..4efebc3be0 100644
--- a/codex-rs/protocol/src/protocol.rs
+++ b/codex-rs/protocol/src/protocol.rs
@@ -2827,6 +2827,7 @@ pub struct TurnContextItem {
     pub realtime_active: Option<bool>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub effort: Option<ReasoningEffortConfig>,
+    pub summary: ReasoningSummaryConfig,
 }
 
 impl TurnContextItem {
@@ -5189,6 +5190,7 @@ mod tests {
             collaboration_mode: None,
             realtime_active: None,
             effort: None,
+            summary: ReasoningSummaryConfig::Auto,
         };
 
         let value = serde_json::to_value(item)?;