fix(telegram): clean up tool-only previews

extensions/telegram/src/bot-message-dispatch.test.ts

@@ -815,6 +815,36 @@ describe("dispatchTelegramMessage draft streaming", () => {
     expect(draftStream.clear).not.toHaveBeenCalled();
   });
 
+  it("cleans up tool-only Telegram previews archived at assistant boundaries", async () => {
+    const draftStream = createSequencedDraftStream(2001);
+    createTelegramDraftStream.mockReturnValue(draftStream);
+    dispatchReplyWithBufferedBlockDispatcher.mockImplementation(async ({ replyOptions }) => {
+      await replyOptions?.onToolStart?.({ name: "exec", phase: "start" });
+      await replyOptions?.onItemEvent?.({
+        kind: "command",
+        name: "exec",
+        progressText: "exec git status",
+      });
+      await replyOptions?.onAssistantMessageStart?.();
+      return { queuedFinal: false };
+    });
+
+    const bot = createBot();
+    await dispatchWithContext({
+      context: createContext(),
+      streamMode: "partial",
+      telegramCfg: { streaming: { mode: "partial" } },
+      bot,
+    });
+
+    expect(draftStream.update).toHaveBeenCalledWith(
+      expect.stringMatching(/`🛠️ Exec: exec git status`$/),
+    );
+    expect(draftStream.materialize).toHaveBeenCalled();
+    expect(draftStream.forceNewMessage).toHaveBeenCalled();
+    expect(bot.api.deleteMessage).toHaveBeenCalledWith(123, 2001);
+  });
+
   it("streams Telegram command progress text by default when preview streaming is active", async () => {
     const draftStream = createDraftStream();
     createTelegramDraftStream.mockReturnValue(draftStream);

extensions/telegram/src/bot-message-dispatch.ts

@@ -483,6 +483,7 @@ export const dispatchTelegramMessage = async ({
     Boolean(answerLane.stream) && resolveChannelStreamingPreviewToolProgress(telegramCfg);
   let previewToolProgressSuppressed = false;
   let previewToolProgressLines: string[] = [];
+  let answerLaneHasAssistantContent = false;
   const renderProgressDraft = async (options?: { flush?: boolean }) => {
     if (!answerLane.stream || streamMode !== "progress") {
       return;
@@ -605,13 +606,14 @@ export const dispatchTelegramMessage = async ({
           messageId: previewMessageId,
           textSnapshot: answerLane.lastPartialText,
           visibleSinceMs: answerLane.stream?.visibleSinceMs?.(),
-          deleteIfUnused: false,
+          deleteIfUnused: !answerLaneHasAssistantContent,
         });
       }
       answerLane.stream?.forceNewMessage();
       didForceNewMessage = true;
     }
     resetDraftLaneState(answerLane);
+    answerLaneHasAssistantContent = false;
     if (didForceNewMessage) {
       activePreviewLifecycleByLane.answer = "transient";
       retainPreviewOnCleanupByLane.answer = false;
@@ -630,6 +632,7 @@ export const dispatchTelegramMessage = async ({
       if (streamMode === "progress") {
         return;
       }
+      answerLaneHasAssistantContent = true;
       previewToolProgressSuppressed = true;
       previewToolProgressLines = [];
     }