diff --git a/sessions/0034/SESSION-0034.0-TRANSCRIPT-2026-06-12T03-28--INPROGRESS.md b/sessions/0034/SESSION-0034.0-TRANSCRIPT-2026-06-12T03-28--INPROGRESS.md
new file mode 100644
index 0000000..3214a70
--- /dev/null
+++ b/sessions/0034/SESSION-0034.0-TRANSCRIPT-2026-06-12T03-28--INPROGRESS.md
@@ -0,0 +1,23 @@
+# Session 0034.0 — Transcript
+
+> App: vscode-cowriting-plugin
+> Start: 2026-06-12T03-28 (PST)
+> Type: planning-and-executing
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0034 for vscode-cowriting-plugin. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0034.0-TRANSCRIPT-2026-06-12T03-28--<end>.md form at session end.
+
+## Launch prompt
+
+```
+/goal plan-and-execute #38 (undo renders wrong marks in the F10 review preview, P1) — reproduce the wrong-marks-after-undo case, find which layer (F3 attribution spans / F4 proposal anchors) goes stale on undo and reconcile it, confirm across edit→undo→redo
+
+```
+
+## Deferred decisions
+
+_Autonomous-mode low-confidence calls the driver made and would have
+liked operator input on. Appended as the session runs; surfaced at
+finalize. Empty if none._
diff --git a/sessions/sessions.json b/sessions/sessions.json
index 04fd4d1..41e98ff 100644
--- a/sessions/sessions.json
+++ b/sessions/sessions.json
@@ -97,5 +97,8 @@
   },
   "0033": {
     "title": ""
+  },
+  "0034": {
+    "title": ""
   }
 }