diff --git a/ecomm/0013/SESSION-0013.0-TRANSCRIPT-2026-06-03T22-25--INPROGRESS.md b/ecomm/0013/SESSION-0013.0-TRANSCRIPT-2026-06-03T22-25--INPROGRESS.md
new file mode 100644
index 0000000..7592b00
--- /dev/null
+++ b/ecomm/0013/SESSION-0013.0-TRANSCRIPT-2026-06-03T22-25--INPROGRESS.md
@@ -0,0 +1,16 @@
+# Session 0013.0 — Transcript
+
+> App: ecomm
+> Start: 2026-06-03T22-25 (PST)
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0013 for ecomm. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0013.0-TRANSCRIPT-2026-06-03T22-25--<end>.md form at session end.
+
+## Launch prompt
+
+```
+build R07 products
+
+```
diff --git a/ecomm/sessions.json b/ecomm/sessions.json
index 575794d..6cd8c03 100644
--- a/ecomm/sessions.json
+++ b/ecomm/sessions.json
@@ -34,5 +34,8 @@
   },
   "0012": {
     "title": ""
+  },
+  "0013": {
+    "title": ""
   }
 }