diff --git a/LESSONS_LEARNED.md b/LESSONS_LEARNED.md
index c01540d..e7a120c 100644
--- a/LESSONS_LEARNED.md
+++ b/LESSONS_LEARNED.md
@@ -23,4 +23,4 @@ This file retains durable lessons discovered while completing tasks in this repo
 | Date | Lesson | Status | Intended canonical target |
 | --- | --- | --- | --- |
 
-No pending lessons currently.
+| 2026-04-21 | After Copilot baseline apply, if the target has no local catalog validation script, confirm convergence with a source-side sync plan and require zero managed create/update/delete operations. | pending | .github/skills/internal-agent-sync-global-copilot-configs-into-repo/references/sync-contract.md |