diff --git a/dev-claude-plugin/0003/SESSION-0003.0-TRANSCRIPT-2026-06-03T17-00--INPROGRESS.md b/dev-claude-plugin/0003/SESSION-0003.0-TRANSCRIPT-2026-06-03T17-00--INPROGRESS.md
new file mode 100644
index 0000000..40eba5e
--- /dev/null
+++ b/dev-claude-plugin/0003/SESSION-0003.0-TRANSCRIPT-2026-06-03T17-00--INPROGRESS.md
@@ -0,0 +1,13 @@
+# Session 0003.0 — Transcript
+
+> App: dev-claude-plugin
+> Start: 2026-06-03T17-00 (PST)
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0003 for dev-claude-plugin. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0003.0-TRANSCRIPT-2026-06-03T17-00--<end>.md form at session end.
+
+## Launch prompt
+
+_(launch prompt not captured at claim time)_
diff --git a/dev-claude-plugin/sessions.json b/dev-claude-plugin/sessions.json
index 7c8731b..9c427e6 100644
--- a/dev-claude-plugin/sessions.json
+++ b/dev-claude-plugin/sessions.json
@@ -4,5 +4,8 @@
   },
   "0002": {
     "title": ""
+  },
+  "0003": {
+    "title": ""
   }
 }