diff --git a/apps/web/src/api/sessions.ts b/apps/web/src/api/sessions.ts
index a4e33a9..04c570d 100644
--- a/apps/web/src/api/sessions.ts
+++ b/apps/web/src/api/sessions.ts
@@ -47,7 +47,8 @@ export async function createInstance(
   toolTypeId: string,
   displayName?: string,
   cloneMode?: string,
-  branch?: string
+  branch?: string,
+  newBranch?: string
 ): Promise<ToolInstance> {
   const response = await apiClient.post(
     `/projects/${projectId}/repositories/${repoId}/instances`,
@@ -56,6 +57,7 @@ export async function createInstance(
       display_name: displayName,
       clone_mode: cloneMode || "mount",
       branch: branch || undefined,
+      new_branch: newBranch || undefined,
     }
   );
   return response.data;