diff --git a/crates/arc-workflows/src/handler/parallel.rs b/crates/arc-workflows/src/handler/parallel.rs
index a648db3a6..d516d8d90 100644
--- a/crates/arc-workflows/src/handler/parallel.rs
+++ b/crates/arc-workflows/src/handler/parallel.rs
@@ -280,10 +280,12 @@ impl Handler for ParallelHandler {
             let (branch_sandbox, worktree_path): (Arc<dyn Sandbox>, Option<PathBuf>) =
                 if let (Some(ref gs), Some(ref bsha)) = (&git_state, &base_sha) {
                     let branch_key = &target_id;
+                    let visit = crate::engine::visit_from_context(&branch_context);
                     let branch_name = format!(
-                        "arc/run/parallel/{}/{}/{}",
+                        "arc/run/parallel/{}/{}/pass{}/{}",
                         gs.run_id,
                         crate::git::sanitize_ref_component(&node.id),
+                        visit,
                         crate::git::sanitize_ref_component(branch_key),
                     );
 
diff --git a/crates/arc-workflows/tests/integration.rs b/crates/arc-workflows/tests/integration.rs
index 59a48029c..ec5f2db91 100644
--- a/crates/arc-workflows/tests/integration.rs
+++ b/crates/arc-workflows/tests/integration.rs
@@ -9582,7 +9582,7 @@ async fn parallel_git_branching_host_e2e() {
     );
 
     // 10. Verify parallel branch refs still exist (for debugging)
-    let branch_ref_a = format!("arc/run/parallel/{run_id}/fan-out/branch-a");
+    let branch_ref_a = format!("arc/run/parallel/{run_id}/fan-out/pass1/branch-a");
     let ref_check = std::process::Command::new("git")
         .args(["rev-parse", "--verify", &branch_ref_a])
         .current_dir(repo.path())