diff --git a/corp/0001/SESSION-0001.0-TRANSCRIPT-2026-06-03T21-00--INPROGRESS.md b/corp/0001/SESSION-0001.0-TRANSCRIPT-2026-06-03T21-00--INPROGRESS.md
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--- /dev/null
+++ b/corp/0001/SESSION-0001.0-TRANSCRIPT-2026-06-03T21-00--INPROGRESS.md
@@ -0,0 +1,13 @@
+# Session 0001.0 — Transcript
+
+> App: corp
+> Start: 2026-06-03T21-00 (PST)
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0001 for corp. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0001.0-TRANSCRIPT-2026-06-03T21-00--<end>.md form at session end.
+
+## Launch prompt
+
+_(launch prompt not captured at claim time)_
diff --git a/corp/sessions.json b/corp/sessions.json
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+{
+  "0001": {
+    "title": ""
+  }
+}