diff --git a/scripts/scenarios/start-app.ts b/scripts/scenarios/start-app.ts
index 5dee3f26c1..0fac2cedc8 100644
--- a/scripts/scenarios/start-app.ts
+++ b/scripts/scenarios/start-app.ts
@@ -126,6 +126,18 @@ const startApp = Effect.fn("startApp")(function* (input: {
   const checkout = yield* HostProcess.WorkingDirectory;
   const hostEnvironment = yield* HostProcess.Environment;
   yield* prepareHome(input.home);
+  const recording = (text: string) => [
+    { type: "expect_outbound", frame: { kind: "request", method: "session/prompt", params: {} } },
+    { type: "emit_inbound", frame: { kind: "notification", method: "session/update", params: { sessionId: "fixture", update: { sessionUpdate: "agent_message_chunk", content: { type: "text", text } } } } },
+    { type: "emit_inbound", frame: { kind: "response", method: "session/prompt", result: { stopReason: "end_turn" } } },
+  ].map((entry) => JSON.stringify(entry)).join("\n");
+  for (const [model, text] of [
+    ["multi_turn", "[a](<workspace>/app/(a)/page.tsx) and [b](<workspace>/app/(b)/page.tsx)"],
+    ["todo_list", "[c](<workspace>/app/c/page.tsx) and [d](<workspace>/app/d/page.tsx)"],
+  ]) {
+    yield* fs.writeFileString(path.join(checkout, `apps/server/src/orchestration-v2/testkit/fixtures/${model}/registry_transcript.ndjson`), recording(text));
+  }
+
   const env = {
     ...hostEnvironment,
     PATH: `${path.join(input.home, "bin")}:${hostEnvironment.PATH ?? ""}`,