fix: avoid silent telegram empty replies (#3796) (#3796)

src/telegram/bot-message-dispatch.ts

@@ -21,6 +21,8 @@ import { createTelegramDraftStream } from "./draft-stream.js";
 import { cacheSticker, describeStickerImage } from "./sticker-cache.js";
 import { resolveAgentDir } from "../agents/agent-scope.js";
 
+const EMPTY_RESPONSE_FALLBACK = "No response generated. Please try again.";
+
 async function resolveStickerVisionSupport(cfg, agentId) {
   try {
     const catalog = await loadModelCatalog({ config: cfg });
@@ -198,6 +200,15 @@ export const dispatchTelegramMessage = async ({
     }
   }
 
+  const replyQuoteText =
+    ctxPayload.ReplyToIsQuote && ctxPayload.ReplyToBody
+      ? ctxPayload.ReplyToBody.trim() || undefined
+      : undefined;
+  const deliveryState = {
+    delivered: false,
+    skippedNonSilent: 0,
+  };
+
   const { queuedFinal } = await dispatchReplyWithBufferedBlockDispatcher({
     ctx: ctxPayload,
     cfg,
@@ -209,12 +220,7 @@ export const dispatchTelegramMessage = async ({
           await flushDraft();
           draftStream?.stop();
         }
-
-        const replyQuoteText =
-          ctxPayload.ReplyToIsQuote && ctxPayload.ReplyToBody
-            ? ctxPayload.ReplyToBody.trim() || undefined
-            : undefined;
-        await deliverReplies({
+        const result = await deliverReplies({
           replies: [payload],
           chatId: String(chatId),
           token: opts.token,
@@ -228,8 +234,13 @@ export const dispatchTelegramMessage = async ({
           onVoiceRecording: sendRecordVoice,
           linkPreview: telegramCfg.linkPreview,
           replyQuoteText,
-          notifyEmptyResponse: info.kind === "final",
         });
+        if (result.delivered) {
+          deliveryState.delivered = true;
+        }
+      },
+      onSkip: (_payload, info) => {
+        if (info.reason !== "silent") deliveryState.skippedNonSilent += 1;
       },
       onError: (err, info) => {
         runtime.error?.(danger(`telegram ${info.kind} reply failed: ${String(err)}`));
@@ -261,7 +272,27 @@ export const dispatchTelegramMessage = async ({
     },
   });
   draftStream?.stop();
-  if (!queuedFinal) {
+  let sentFallback = false;
+  if (!deliveryState.delivered && deliveryState.skippedNonSilent > 0) {
+    const result = await deliverReplies({
+      replies: [{ text: EMPTY_RESPONSE_FALLBACK }],
+      chatId: String(chatId),
+      token: opts.token,
+      runtime,
+      bot,
+      replyToMode,
+      textLimit,
+      messageThreadId: resolvedThreadId,
+      tableMode,
+      chunkMode,
+      linkPreview: telegramCfg.linkPreview,
+      replyQuoteText,
+    });
+    sentFallback = result.delivered;
+  }
+
+  const hasFinalResponse = queuedFinal || sentFallback;
+  if (!hasFinalResponse) {
     if (isGroup && historyKey) {
       clearHistoryEntriesIfEnabled({ historyMap: groupHistories, historyKey, limit: historyLimit });
     }