diff --git a/conductor/tracks/on_demand_def_lookup_20260306/plan.md b/conductor/tracks/on_demand_def_lookup_20260306/plan.md
index a71fbe7..c4a1a87 100644
--- a/conductor/tracks/on_demand_def_lookup_20260306/plan.md
+++ b/conductor/tracks/on_demand_def_lookup_20260306/plan.md
@@ -2,7 +2,7 @@
 
 > **Reference:** [Spec](./spec.md) | [Architecture Guide](../../../docs/guide_architecture.md)
 
-## Phase 1: Symbol Parsing
+## Phase 1: Symbol Parsing [checkpoint: f392aa3]
 Focus: Parse @symbol syntax from user input
 
 - [x] Task 1.1: Initialize MMA Environment