diff --git a/codex-rs/core/src/session/mcp.rs b/codex-rs/core/src/session/mcp.rs
index d0b82ee031..012e27ca3c 100644
--- a/codex-rs/core/src/session/mcp.rs
+++ b/codex-rs/core/src/session/mcp.rs
@@ -77,6 +77,13 @@ impl Session {
         Arc::new(GuardianMcpElicitationReviewer::new(self))
     }
 
+    pub(crate) fn start_mcp_connection_manager_initialization(self: &Arc<Self>) {
+        let session = Arc::clone(self);
+        drop(self.services.runtime_handle.spawn(async move {
+            session.ensure_mcp_connection_manager_initialized().await;
+        }));
+    }
+
     fn session_mcp_runtime_environment(
         &self,
         session_configuration: &SessionConfiguration,
diff --git a/codex-rs/core/src/session/session.rs b/codex-rs/core/src/session/session.rs
index 54fe253dcf..148e2e2955 100644
--- a/codex-rs/core/src/session/session.rs
+++ b/codex-rs/core/src/session/session.rs
@@ -994,6 +994,7 @@ impl Session {
             for event in events {
                 sess.send_event_raw(event).await;
             }
+            sess.start_mcp_connection_manager_initialization();
             sess.schedule_startup_prewarm(session_configuration.base_instructions.clone())
                 .await;
             let session_start_source = match &initial_history {