fix(channels): skip empty progress drafts

extensions/matrix/src/matrix/monitor/handler.test.ts

@@ -2794,6 +2794,24 @@ describe("matrix monitor handler draft streaming", () => {
     await finish();
   });
 
+  it("does not create a blank Matrix progress draft when label and lines are disabled", async () => {
+    const { dispatch } = createStreamingHarness({
+      streaming: "progress",
+      previewToolProgressEnabled: false,
+      accountConfig: {
+        streaming: { mode: "progress", progress: { label: false, toolProgress: false } },
+      } as never,
+    });
+    const { opts, finish } = await dispatch();
+
+    await opts.onItemEvent?.({ progressText: "tool one" });
+    await opts.onItemEvent?.({ progressText: "tool two" });
+
+    expect(opts.suppressDefaultToolProgressMessages).toBe(true);
+    expect(sendSingleTextMessageMatrixMock).not.toHaveBeenCalled();
+    await finish();
+  });
+
   it("keeps partial preview-first finalization on the existing draft when text is unchanged", async () => {
     const { dispatch, redactEventMock } = createStreamingHarness({
       blockStreamingEnabled: true,

extensions/matrix/src/matrix/monitor/handler.ts

@@ -1504,15 +1504,17 @@ export function createMatrixRoomMessageHandler(params: MatrixMonitorHandlerParam
         if (!draftStream || !progressDraftStreaming) {
           return;
         }
-        draftStream.update(
-          formatChannelProgressDraftText({
-            entry: progressConfigEntry,
-            lines: previewToolProgressLines,
-            seed: progressSeed,
-            formatLine: formatMatrixToolProgressMarkdownCode,
-            bullet: "-",
-          }),
-        );
+        const previewText = formatChannelProgressDraftText({
+          entry: progressConfigEntry,
+          lines: previewToolProgressLines,
+          seed: progressSeed,
+          formatLine: formatMatrixToolProgressMarkdownCode,
+          bullet: "-",
+        });
+        if (!previewText) {
+          return;
+        }
+        draftStream.update(previewText);
       };
       const progressDraftGate = createChannelProgressDraftGate({
         onStart: renderProgressDraft,