diff --git a/extensions/qa-lab/src/suite-runtime-agent-session.ts b/extensions/qa-lab/src/suite-runtime-agent-session.ts
index a5bdf234b9a..65cc4ea94da 100644
--- a/extensions/qa-lab/src/suite-runtime-agent-session.ts
+++ b/extensions/qa-lab/src/suite-runtime-agent-session.ts
@@ -39,9 +39,12 @@ async function seedQaSessionTranscript(
     agentId?: string;
     sessionId: string;
     sessionKey?: string;
-    messages: Array<{ role: string; content: unknown; timestamp?: number | string }>;
+    messages?: Array<{ role: string; content: unknown; timestamp?: number | string }>;
     now?: number;
     originLabel?: string;
+    lastChannel?: string;
+    lastProvider?: string;
+    lastTo?: string;
   },
 ) {
   const agentId = params.agentId?.trim() || "qa";
@@ -52,10 +55,11 @@ async function seedQaSessionTranscript(
   }
   const sessionFile = createSqliteSessionTranscriptLocator({ agentId, sessionId });
   const sessionKey = params.sessionKey?.trim() || `agent:${agentId}:seed-${sessionId}`;
+  const messages = params.messages ?? [];
   let parentId: string | null = null;
-  const messageEvents = params.messages.map((message, index) => {
+  const messageEvents = messages.map((message, index) => {
     const id = `qa-seed-${index + 1}`;
-    const timestampMs = now - Math.max(1, params.messages.length - index) * 30_000;
+    const timestampMs = now - Math.max(1, messages.length - index) * 30_000;
     const event = {
       type: "message" as const,
       id,
@@ -97,6 +101,9 @@ async function seedQaSessionTranscript(
       sessionId,
       updatedAt: now,
       sessionFile,
+      ...(params.lastChannel ? { lastChannel: params.lastChannel } : {}),
+      ...(params.lastProvider ? { lastProvider: params.lastProvider } : {}),
+      ...(params.lastTo ? { lastTo: params.lastTo } : {}),
       origin: {
         label: params.originLabel ?? "QA seeded SQLite transcript",
       },
diff --git a/qa/scenarios/memory/commitments-heartbeat-target-none.md b/qa/scenarios/memory/commitments-heartbeat-target-none.md
index b8d49b1d65f..cf5c9838ec1 100644
--- a/qa/scenarios/memory/commitments-heartbeat-target-none.md
+++ b/qa/scenarios/memory/commitments-heartbeat-target-none.md
@@ -64,28 +64,31 @@ steps:
       - set: stateDir
         value:
           expr: "path.join(env.gateway.tempRoot, 'state')"
-      - set: sessionsPath
-        value:
-          expr: "path.join(stateDir, 'agents', 'qa', 'sessions', 'sessions.json')"
       - set: commitmentStorePath
         value:
           expr: "path.join(stateDir, 'commitments', 'commitments.json')"
       - set: dueNow
         value:
           expr: "Date.now()"
-      - call: fs.mkdir
-        args:
-          - expr: "path.dirname(sessionsPath)"
-          - recursive: true
       - call: fs.mkdir
         args:
           - expr: "path.dirname(commitmentStorePath)"
           - recursive: true
-      - call: fs.writeFile
+      - call: seedQaSessionTranscript
+        saveAs: seededSession
         args:
-          - ref: sessionsPath
-          - expr: "JSON.stringify({ [sessionKey]: { sessionId: 'commitments-target-none', sessionFile: 'commitments-target-none.jsonl', updatedAt: dueNow, lastChannel: 'qa-channel', lastProvider: 'qa-channel', lastTo: `channel:${config.conversationId}` } }, null, 2)"
-          - utf8
+          - ref: env
+          - agentId: qa
+            sessionId: commitments-target-none
+            sessionKey:
+              ref: sessionKey
+            now:
+              ref: dueNow
+            originLabel: QA seeded commitments heartbeat target-none session
+            lastChannel: qa-channel
+            lastProvider: qa-channel
+            lastTo:
+              expr: "`channel:${config.conversationId}`"
       - call: fs.writeFile
         args:
           - ref: commitmentStorePath