diff --git a/sessions/0037/SESSION-0037.0-TRANSCRIPT-2026-06-12T13-33--INPROGRESS.md b/sessions/0037/SESSION-0037.0-TRANSCRIPT-2026-06-12T13-33--INPROGRESS.md
new file mode 100644
index 0000000..a7e1fe2
--- /dev/null
+++ b/sessions/0037/SESSION-0037.0-TRANSCRIPT-2026-06-12T13-33--INPROGRESS.md
@@ -0,0 +1,22 @@
+# Session 0037.0 — Transcript
+
+> App: vscode-cowriting-plugin
+> Start: 2026-06-12T13-33 (PST)
+> Type: planning-and-executing
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0037 for vscode-cowriting-plugin. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0037.0-TRANSCRIPT-2026-06-12T13-33--<end>.md form at session end.
+
+## Launch prompt
+
+```
+plan-and-execute #43 (F11), per specs/2026-06-12-f11-preview-toolbar-interaction-surface.md. Start with SLICE-1 (Pin baseline button + unhide pinDiffBaseline) — the immediate win.
+```
+
+## 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 d044dc2..50d5654 100644
--- a/sessions/sessions.json
+++ b/sessions/sessions.json
@@ -106,5 +106,8 @@
   },
   "0036": {
     "title": ""
+  },
+  "0037": {
+    "title": ""
   }
 }