diff --git a/desktop/src-tauri/src/managed_agents/runtime.rs b/desktop/src-tauri/src/managed_agents/runtime.rs
index b1bcbcb70f..7c67d23320 100644
--- a/desktop/src-tauri/src/managed_agents/runtime.rs
+++ b/desktop/src-tauri/src/managed_agents/runtime.rs
@@ -68,34 +68,8 @@ mod lifecycle;
 use lifecycle::kill_stale_tracked_processes_with;
 pub use lifecycle::{kill_stale_tracked_processes, sync_managed_agent_processes};
 
-/// Classify an agent's persona against the live catalog for the Agents-menu
-/// drift indicator. Returns `(out_of_date, orphaned)`.
-///
-/// Drift basis is the RECORD's `persona_source_version`, never the engram:
-/// - persona_id set + persona present: out_of_date when the snapshot hash
-///   differs from the persona's current content hash.
-/// - persona_id set + persona gone: orphaned (no current hash to respawn into,
-///   so never out_of_date — we must not tell the user to respawn into nothing).
-/// - no persona_id: neither — a hand-built agent has no persona to drift from.
-fn persona_drift_state(
-    record: &ManagedAgentRecord,
-    personas: &[crate::managed_agents::types::AgentDefinition],
-) -> (bool, bool) {
-    let Some(persona_id) = record.persona_id.as_deref() else {
-        return (false, false);
-    };
-    let Some(persona) = personas.iter().find(|p| p.id == persona_id) else {
-        return (false, true);
-    };
-    let current = crate::managed_agents::persona_events::persona_content_hash(
-        &crate::managed_agents::persona_events::persona_event_content(persona),
-    );
-    let out_of_date = record
-        .persona_source_version
-        .as_deref()
-        .is_some_and(|pinned| pinned != current);
-    (out_of_date, false)
-}
+mod drift;
+pub(crate) use drift::persona_drift_state;
 
 /// Resolve the runtime-pair key this record maps to for the active
 /// workspace: always the active workspace relay (the legacy per-record relay
diff --git a/desktop/src-tauri/src/managed_agents/runtime/drift.rs b/desktop/src-tauri/src/managed_agents/runtime/drift.rs
new file mode 100644
index 0000000000..1f4b2cfbc0
--- /dev/null
+++ b/desktop/src-tauri/src/managed_agents/runtime/drift.rs
@@ -0,0 +1,32 @@
+//! Persona drift classification for the Agents-menu drift indicator.
+
+use crate::managed_agents::{types::AgentDefinition, ManagedAgentRecord};
+
+/// Classify an agent's persona against the live catalog for the Agents-menu
+/// drift indicator. Returns `(out_of_date, orphaned)`.
+///
+/// Drift basis is the RECORD's `persona_source_version`, never the engram:
+/// - persona_id set + persona present: out_of_date when the snapshot hash
+///   differs from the persona's current content hash.
+/// - persona_id set + persona gone: orphaned (no current hash to respawn into,
+///   so never out_of_date — we must not tell the user to respawn into nothing).
+/// - no persona_id: neither — a hand-built agent has no persona to drift from.
+pub(crate) fn persona_drift_state(
+    record: &ManagedAgentRecord,
+    personas: &[AgentDefinition],
+) -> (bool, bool) {
+    let Some(persona_id) = record.persona_id.as_deref() else {
+        return (false, false);
+    };
+    let Some(persona) = personas.iter().find(|p| p.id == persona_id) else {
+        return (false, true);
+    };
+    let current = crate::managed_agents::persona_events::persona_content_hash(
+        &crate::managed_agents::persona_events::persona_event_content(persona),
+    );
+    let out_of_date = record
+        .persona_source_version
+        .as_deref()
+        .is_some_and(|pinned| pinned != current);
+    (out_of_date, false)
+}