diff --git a/codex-rs/exec/src/cli_tests.rs b/codex-rs/exec/src/cli_tests.rs
index 5eb3245bba..304fc8072f 100644
--- a/codex-rs/exec/src/cli_tests.rs
+++ b/codex-rs/exec/src/cli_tests.rs
@@ -102,7 +102,6 @@ fn parses_config_isolation_flags() {
 
     assert!(cli.ignore_user_config);
     assert!(cli.ignore_rules);
-    assert_eq!(cli.thread_source, None);
 }
 
 #[test]
diff --git a/codex-rs/exec/tests/suite/resume.rs b/codex-rs/exec/tests/suite/resume.rs
index 4e4ef19da6..ead58a07d2 100644
--- a/codex-rs/exec/tests/suite/resume.rs
+++ b/codex-rs/exec/tests/suite/resume.rs
@@ -199,6 +199,7 @@ async fn exec_resume_last_appends_to_existing_file() -> anyhow::Result<()> {
             .expect("rollout should contain session metadata"),
     )?;
     assert_eq!(meta["payload"]["history_mode"], "paginated");
+    assert_eq!(meta["payload"]["thread_source"], "user");
 
     // 2) Second run: resume the most recent file with a new marker.
     let marker2 = format!("resume-last-2-{}", Uuid::new_v4());