diff --git a/codex-rs/core/src/codex.rs b/codex-rs/core/src/codex.rs
index 66a0dc527eff..c7931b27df9b 100644
--- a/codex-rs/core/src/codex.rs
+++ b/codex-rs/core/src/codex.rs
@@ -41,6 +41,7 @@ use crate::stream_events_utils::HandleOutputCtx;
 use crate::stream_events_utils::handle_non_tool_response_item;
 use crate::stream_events_utils::handle_output_item_done;
 use crate::stream_events_utils::last_assistant_message_from_item;
+use crate::stream_events_utils::mark_thread_memory_mode_polluted_if_external_context;
 use crate::stream_events_utils::raw_assistant_output_text_from_item;
 use crate::stream_events_utils::record_completed_response_item;
 use crate::turn_metadata::TurnMetadataState;
@@ -7830,8 +7831,15 @@ async fn drain_in_flight(
     while let Some(res) = in_flight.next().await {
         match res {
             Ok(response_input) => {
-                sess.record_conversation_items(&turn_context, &[response_input.into()])
+                let response_item = response_input.into();
+                sess.record_conversation_items(&turn_context, std::slice::from_ref(&response_item))
                     .await;
+                mark_thread_memory_mode_polluted_if_external_context(
+                    sess.as_ref(),
+                    turn_context.as_ref(),
+                    &response_item,
+                )
+                .await;
             }
             Err(err) => {
                 error_or_panic(format!("in-flight tool future failed during drain: {err}"));
diff --git a/codex-rs/core/src/stream_events_utils.rs b/codex-rs/core/src/stream_events_utils.rs
index d491bb6adb22..3838d6ed0168 100644
--- a/codex-rs/core/src/stream_events_utils.rs
+++ b/codex-rs/core/src/stream_events_utils.rs
@@ -136,11 +136,20 @@ pub(crate) async fn record_completed_response_item(
         sess.defer_mailbox_delivery_to_next_turn(&turn_context.sub_id)
             .await;
     }
-    maybe_mark_thread_memory_mode_polluted_from_web_search(sess, turn_context, item).await;
+    mark_thread_memory_mode_polluted_if_external_context(sess, turn_context, item).await;
     record_stage1_output_usage_for_completed_item(turn_context, item).await;
 }
 
-async fn maybe_mark_thread_memory_mode_polluted_from_web_search(
+fn response_item_may_include_external_context(item: &ResponseItem) -> bool {
+    matches!(
+        item,
+        ResponseItem::ToolSearchCall { .. }
+            | ResponseItem::ToolSearchOutput { .. }
+            | ResponseItem::WebSearchCall { .. }
+    )
+}
+
+pub(crate) async fn mark_thread_memory_mode_polluted_if_external_context(
     sess: &Session,
     turn_context: &TurnContext,
     item: &ResponseItem,
@@ -149,7 +158,7 @@ async fn maybe_mark_thread_memory_mode_polluted_from_web_search(
         .config
         .memories
         .no_memories_if_mcp_or_web_search
-        || !matches!(item, ResponseItem::WebSearchCall { .. })
+        || !response_item_may_include_external_context(item)
     {
         return;
     }
diff --git a/codex-rs/core/src/stream_events_utils_tests.rs b/codex-rs/core/src/stream_events_utils_tests.rs
index e3947a06edb7..2634a8874204 100644
--- a/codex-rs/core/src/stream_events_utils_tests.rs
+++ b/codex-rs/core/src/stream_events_utils_tests.rs
@@ -2,11 +2,16 @@ use super::completed_item_defers_mailbox_delivery_to_next_turn;
 use super::handle_non_tool_response_item;
 use super::image_generation_artifact_path;
 use super::last_assistant_message_from_item;
+use super::response_item_may_include_external_context;
 use super::save_image_generation_result;
 use crate::codex::make_session_and_context;
 use codex_protocol::error::CodexErr;
 use codex_protocol::items::TurnItem;
 use codex_protocol::models::ContentItem;
+use codex_protocol::models::FunctionCallOutputPayload;
+use codex_protocol::models::LocalShellAction;
+use codex_protocol::models::LocalShellExecAction;
+use codex_protocol::models::LocalShellStatus;
 use codex_protocol::models::MessagePhase;
 use codex_protocol::models::ResponseItem;
 use codex_utils_absolute_path::test_support::PathExt;
@@ -28,6 +33,84 @@ fn assistant_output_text_with_phase(text: &str, phase: Option<MessagePhase>) ->
     }
 }
 
+#[test]
+fn external_context_pollution_items_include_web_search_and_tool_search() {
+    let polluting_items = [
+        ResponseItem::WebSearchCall {
+            id: None,
+            status: Some("completed".to_string()),
+            action: None,
+        },
+        ResponseItem::ToolSearchCall {
+            id: None,
+            call_id: Some("search-1".to_string()),
+            status: None,
+            execution: "client".to_string(),
+            arguments: serde_json::json!({"query": "calendar"}),
+        },
+        ResponseItem::ToolSearchOutput {
+            call_id: Some("search-1".to_string()),
+            status: "completed".to_string(),
+            execution: "client".to_string(),
+            tools: Vec::new(),
+        },
+    ];
+
+    assert!(
+        polluting_items
+            .iter()
+            .all(response_item_may_include_external_context)
+    );
+}
+
+#[test]
+fn external_context_pollution_items_exclude_local_tool_calls() {
+    let non_polluting_items = [
+        ResponseItem::LocalShellCall {
+            id: None,
+            call_id: Some("shell-1".to_string()),
+            status: LocalShellStatus::Completed,
+            action: LocalShellAction::Exec(LocalShellExecAction {
+                command: vec!["cat".to_string(), "README.md".to_string()],
+                timeout_ms: None,
+                working_directory: None,
+                env: None,
+                user: None,
+            }),
+        },
+        ResponseItem::FunctionCall {
+            id: None,
+            name: "shell".to_string(),
+            namespace: None,
+            arguments: "{}".to_string(),
+            call_id: "call-1".to_string(),
+        },
+        ResponseItem::FunctionCallOutput {
+            call_id: "call-1".to_string(),
+            output: FunctionCallOutputPayload::from_text("ok".to_string()),
+        },
+        ResponseItem::CustomToolCall {
+            id: None,
+            status: None,
+            call_id: "custom-1".to_string(),
+            name: "apply_patch".to_string(),
+            input: "*** Begin Patch\n*** End Patch\n".to_string(),
+        },
+        ResponseItem::CustomToolCallOutput {
+            call_id: "custom-1".to_string(),
+            name: Some("apply_patch".to_string()),
+            output: FunctionCallOutputPayload::from_text("ok".to_string()),
+        },
+        assistant_output_text("plain assistant text"),
+    ];
+
+    assert!(
+        !non_polluting_items
+            .iter()
+            .any(response_item_may_include_external_context)
+    );
+}
+
 #[tokio::test]
 async fn handle_non_tool_response_item_strips_citations_from_assistant_message() {
     let (session, turn_context) = make_session_and_context().await;