diff --git a/codex-rs/core/src/agents_md.rs b/codex-rs/core/src/agents_md.rs
index b87af39c39..8905ad48c8 100644
--- a/codex-rs/core/src/agents_md.rs
+++ b/codex-rs/core/src/agents_md.rs
@@ -349,7 +349,7 @@ impl LoadedAgentsMd {
         Self {
             entries: vec![InstructionEntry {
                 contents,
-                provenance: InstructionProvenance::Internal,
+                provenance: InstructionProvenance::Global(None),
             }],
         }
     }
diff --git a/codex-rs/core/src/agents_md_tests.rs b/codex-rs/core/src/agents_md_tests.rs
index 2f309632a7..275c5ae015 100644
--- a/codex-rs/core/src/agents_md_tests.rs
+++ b/codex-rs/core/src/agents_md_tests.rs
@@ -221,26 +221,14 @@ fn configured_and_persisted_instructions_are_bounded_for_model_context() {
 fn replacing_global_instructions_preserves_project_entries_within_the_bound() {
     let project_source =
         AbsolutePathBuf::from_absolute_path("/tmp/project/AGENTS.md").expect("absolute path");
-    let mut loaded = LoadedAgentsMd {
-        entries: vec![
-            InstructionEntry {
-                contents: "old global".to_string(),
-                provenance: InstructionProvenance::Global(None),
-            },
-            InstructionEntry {
-                contents: "project".to_string(),
-                provenance: InstructionProvenance::Project(Some(project_source.clone())),
-            },
-        ],
-    };
-
-    loaded.replace_global(LoadedAgentsMd {
-        entries: vec![InstructionEntry {
-            contents: "new global".to_string(),
-            provenance: InstructionProvenance::Global(None),
-        }],
+    let mut loaded = LoadedAgentsMd::from_text_for_testing("old global");
+    loaded.entries.push(InstructionEntry {
+        contents: "project".to_string(),
+        provenance: InstructionProvenance::Project(Some(project_source.clone())),
     });
 
+    loaded.replace_global(LoadedAgentsMd::from_text_for_testing("new global"));
+
     assert_eq!(
         loaded,
         LoadedAgentsMd {