diff --git a/extensions/qa-matrix/src/runners/contract/scenario-catalog.ts b/extensions/qa-matrix/src/runners/contract/scenario-catalog.ts
index dc5ef8cbaaa..50f8415f2ef 100644
--- a/extensions/qa-matrix/src/runners/contract/scenario-catalog.ts
+++ b/extensions/qa-matrix/src/runners/contract/scenario-catalog.ts
@@ -87,6 +87,7 @@ export const MATRIX_QA_RESTART_ROOM_KEY = "restart";
 export const MATRIX_QA_SECONDARY_ROOM_KEY = "secondary";
 
 const MATRIX_QA_LIVE_MODEL_TIMEOUT_MS = 120_000;
+const MATRIX_QA_IMAGE_GENERATION_TIMEOUT_MS = 180_000;
 const MATRIX_QA_E2EE_REPLY_TIMEOUT_MS = 150_000;
 const MATRIX_QA_E2EE_MEDIA_TIMEOUT_MS = 180_000;
 
@@ -311,7 +312,7 @@ export const MATRIX_QA_SCENARIOS: MatrixQaScenarioDefinition[] = [
   },
   {
     id: "matrix-room-generated-image-delivery",
-    timeoutMs: 60_000,
+    timeoutMs: MATRIX_QA_IMAGE_GENERATION_TIMEOUT_MS,
     title: "Matrix generated images deliver as real image attachments while streaming",
     topology: MATRIX_QA_MEDIA_ROOM_TOPOLOGY,
     configOverrides: {
diff --git a/extensions/qa-matrix/src/runners/contract/scenario-runtime-room.ts b/extensions/qa-matrix/src/runners/contract/scenario-runtime-room.ts
index dc691062b77..7f4964bcd3c 100644
--- a/extensions/qa-matrix/src/runners/contract/scenario-runtime-room.ts
+++ b/extensions/qa-matrix/src/runners/contract/scenario-runtime-room.ts
@@ -297,9 +297,10 @@ export async function runSubagentThreadSpawnScenario(context: MatrixQaScenarioCo
   const { client, startSince } = await primeMatrixQaDriverScenarioClient(context);
   const childToken = buildMatrixQaToken("MATRIX_QA_SUBAGENT_CHILD");
   const triggerBody = [
-    `${context.sutUserId} Use sessions_spawn for this QA check.`,
-    `task="Reply exactly \`${childToken}\`. This is the marker."`,
-    "label=matrix-thread-subagent thread=true mode=session runTimeoutSeconds=30",
+    `${context.sutUserId} Call sessions_spawn now for this QA check.`,
+    `Use task="Reply exactly \`${childToken}\`. This is the marker."`,
+    "Use label=matrix-thread-subagent thread=true mode=session runTimeoutSeconds=60.",
+    "Do not answer with the marker yourself.",
   ].join(" ");
   const driverEventId = await client.sendTextMessage({
     body: triggerBody,
diff --git a/extensions/qa-matrix/src/runners/contract/scenarios.test.ts b/extensions/qa-matrix/src/runners/contract/scenarios.test.ts
index b56db27bd39..3342d17d495 100644
--- a/extensions/qa-matrix/src/runners/contract/scenarios.test.ts
+++ b/extensions/qa-matrix/src/runners/contract/scenarios.test.ts
@@ -169,6 +169,9 @@ describe("matrix live qa scenarios", () => {
     expect(scenarios.get("matrix-subagent-thread-spawn")?.timeoutMs).toBeGreaterThanOrEqual(
       120_000,
     );
+    expect(scenarios.get("matrix-room-generated-image-delivery")?.timeoutMs).toBeGreaterThanOrEqual(
+      180_000,
+    );
     expect(scenarios.get("matrix-e2ee-restart-resume")?.timeoutMs).toBeGreaterThanOrEqual(150_000);
     expect(scenarios.get("matrix-e2ee-artifact-redaction")?.timeoutMs).toBeGreaterThanOrEqual(
       150_000,
@@ -1356,7 +1359,12 @@ describe("matrix live qa scenarios", () => {
     });
 
     expect(sendTextMessage).toHaveBeenCalledWith({
-      body: expect.stringContaining("Use sessions_spawn for this QA check"),
+      body: expect.stringContaining("Call sessions_spawn now for this QA check"),
+      mentionUserIds: ["@sut:matrix-qa.test"],
+      roomId: "!main:matrix-qa.test",
+    });
+    expect(sendTextMessage).toHaveBeenCalledWith({
+      body: expect.stringContaining("runTimeoutSeconds=60"),
       mentionUserIds: ["@sut:matrix-qa.test"],
       roomId: "!main:matrix-qa.test",
     });