diff --git a/dev-claude-plugin/0028/SESSION-0028.0-TRANSCRIPT-2026-06-07T15-59--INPROGRESS.md b/dev-claude-plugin/0028/SESSION-0028.0-TRANSCRIPT-2026-06-07T15-59--INPROGRESS.md
new file mode 100644
index 0000000..e5187ef
--- /dev/null
+++ b/dev-claude-plugin/0028/SESSION-0028.0-TRANSCRIPT-2026-06-07T15-59--INPROGRESS.md
@@ -0,0 +1,22 @@
+# Session 0028.0 — Transcript
+
+> App: dev-claude-plugin
+> Start: 2026-06-07T15-59 (PST)
+> Type: executing-plans
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0028 for dev-claude-plugin. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0028.0-TRANSCRIPT-2026-06-07T15-59--<end>.md form at session end.
+
+## Launch prompt
+
+```
+Implement the two-session-model + spec/plan content-repo collections design: rebase feat/two-session-artifact-collections onto origin/main, then writing-plans -> execute -> ship (>=0.21.0)
+```
+
+## 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/dev-claude-plugin/sessions.json b/dev-claude-plugin/sessions.json
index 9645ab5..45b451b 100644
--- a/dev-claude-plugin/sessions.json
+++ b/dev-claude-plugin/sessions.json
@@ -79,5 +79,8 @@
   },
   "0027": {
     "title": ""
+  },
+  "0028": {
+    "title": ""
   }
 }