diff --git a/desktop/src-tauri/src/commands/personas/update/concurrent_edit_tests.rs b/desktop/src-tauri/src/commands/personas/update/concurrent_edit_tests.rs
index e02d7e4173..23263fe60d 100644
--- a/desktop/src-tauri/src/commands/personas/update/concurrent_edit_tests.rs
+++ b/desktop/src-tauri/src/commands/personas/update/concurrent_edit_tests.rs
@@ -36,6 +36,7 @@ fn persona(id: &str, display_name: &str, updated_at: &str) -> AgentDefinition {
         id: id.to_string(),
         display_name: display_name.to_string(),
         avatar_url: None,
+        description: None,
         system_prompt: "Do the work.".to_string(),
         runtime: None,
         model: None,
@@ -151,6 +152,7 @@ fn update_request(id: &str, display_name: &str, expected: Option<&str>) -> Updat
         id: id.to_string(),
         display_name: display_name.to_string(),
         avatar_url: None,
+        description: None,
         system_prompt: "Do the work.".to_string(),
         runtime: None,
         model: None,
@@ -459,6 +461,7 @@ async fn linked_instance_rename_completes_before_retain_error_propagates() {
         respond_to: Default::default(),
         respond_to_allowlist: vec![],
         display_name: Some("Alice".to_string()),
+        description: None,
         slug: None,
         runtime: None,
         name_pool: vec![],
@@ -485,6 +488,7 @@ async fn linked_instance_rename_completes_before_retain_error_propagates() {
             id: "p1".to_string(),
             display_name: "Alice Renamed".to_string(),
             avatar_url: None,
+            description: None,
             system_prompt: "Do the work.".to_string(),
             runtime: None,
             model: None,
diff --git a/desktop/src/shared/api/personaTypes.ts b/desktop/src/shared/api/personaTypes.ts
index f18e9fe96b..8dd7cf2d9e 100644
--- a/desktop/src/shared/api/personaTypes.ts
+++ b/desktop/src/shared/api/personaTypes.ts
@@ -95,4 +95,11 @@ export type UpdatePersonaInput = {
   namePool?: string[];
   envVars?: Record<string, string>;
   behavior?: PersonaBehaviorInput;
+  /**
+   * Seed-time definition revision for the backend's lock-held compare-and-swap.
+   * When present the backend rejects the write if the persisted `updated_at`
+   * has advanced since the editor was seeded — preventing a stale full-replacement
+   * from clobbering a concurrent writer. Omit (undefined) to skip the check.
+   */
+  expectedUpdatedAt?: string;
 };