diff --git a/extensions/telegram/src/bot/delivery.send.ts b/extensions/telegram/src/bot/delivery.send.ts
index 0274b7f8ac1..1e9aae4ff4e 100644
--- a/extensions/telegram/src/bot/delivery.send.ts
+++ b/extensions/telegram/src/bot/delivery.send.ts
@@ -3,6 +3,7 @@ import type { RuntimeEnv } from "openclaw/plugin-sdk/runtime-env";
 import { formatErrorMessage } from "openclaw/plugin-sdk/ssrf-runtime";
 import { withTelegramApiErrorLogging } from "../api-logging.js";
 import { markdownToTelegramHtml } from "../format.js";
+import { normalizeTelegramReplyToMessageId } from "../outbound-params.js";
 import { buildInlineKeyboard } from "../send.js";
 import { buildTelegramThreadParams, type TelegramThreadSpec } from "./helpers.js";
 
@@ -82,8 +83,9 @@ export function buildTelegramSendParams(opts?: {
 }): Record<string, unknown> {
   const threadParams = buildTelegramThreadParams(opts?.thread);
   const params: Record<string, unknown> = {};
-  if (opts?.replyToMessageId) {
-    params.reply_to_message_id = opts.replyToMessageId;
+  const replyToMessageId = normalizeTelegramReplyToMessageId(opts?.replyToMessageId);
+  if (replyToMessageId != null) {
+    params.reply_to_message_id = replyToMessageId;
     params.allow_sending_without_reply = true;
   }
   if (threadParams) {
diff --git a/extensions/telegram/src/bot/helpers.ts b/extensions/telegram/src/bot/helpers.ts
index 3d5037f153f..1a0cceb313f 100644
--- a/extensions/telegram/src/bot/helpers.ts
+++ b/extensions/telegram/src/bot/helpers.ts
@@ -9,6 +9,7 @@ import type {
 import { readChannelAllowFromStore } from "openclaw/plugin-sdk/conversation-runtime";
 import { normalizeAccountId } from "openclaw/plugin-sdk/routing";
 import { firstDefined, normalizeAllowFrom, type NormalizedAllowFrom } from "../bot-access.js";
+import { normalizeTelegramReplyToMessageId } from "../outbound-params.js";
 import type { TelegramGetChat, TelegramStreamMode } from "./types.js";
 
 const TELEGRAM_GENERAL_TOPIC_ID = 1;
@@ -415,14 +416,7 @@ export function expandTextLinks(text: string, entities?: TelegramTextLinkEntity[
 }
 
 export function resolveTelegramReplyId(raw?: string): number | undefined {
-  if (!raw) {
-    return undefined;
-  }
-  const parsed = Number(raw);
-  if (!Number.isFinite(parsed)) {
-    return undefined;
-  }
-  return parsed;
+  return normalizeTelegramReplyToMessageId(raw);
 }
 
 export type TelegramReplyTarget = {
diff --git a/extensions/telegram/src/draft-stream.ts b/extensions/telegram/src/draft-stream.ts
index d44122e14d0..51d37cee254 100644
--- a/extensions/telegram/src/draft-stream.ts
+++ b/extensions/telegram/src/draft-stream.ts
@@ -2,6 +2,7 @@ import type { Bot } from "grammy";
 import { createFinalizableDraftLifecycle } from "openclaw/plugin-sdk/channel-lifecycle";
 import { buildTelegramThreadParams, type TelegramThreadSpec } from "./bot/helpers.js";
 import { isSafeToRetrySendError, isTelegramClientRejection } from "./network-errors.js";
+import { normalizeTelegramReplyToMessageId } from "./outbound-params.js";
 
 const TELEGRAM_STREAM_MAX_CHARS = 4096;
 const DEFAULT_THROTTLE_MS = 1000;
@@ -145,11 +146,12 @@ export function createTelegramDraftStream(params: {
         ? false
         : params.thread?.scope === "dm";
   const threadParams = buildTelegramThreadParams(params.thread);
+  const replyToMessageId = normalizeTelegramReplyToMessageId(params.replyToMessageId);
   const replyParams =
-    params.replyToMessageId != null
+    replyToMessageId != null
       ? {
           ...threadParams,
-          reply_to_message_id: params.replyToMessageId,
+          reply_to_message_id: replyToMessageId,
           allow_sending_without_reply: true,
         }
       : threadParams;
diff --git a/extensions/telegram/src/outbound-params.ts b/extensions/telegram/src/outbound-params.ts
index 7dd3b7f1169..33126f8192c 100644
--- a/extensions/telegram/src/outbound-params.ts
+++ b/extensions/telegram/src/outbound-params.ts
@@ -1,11 +1,3 @@
-export function parseTelegramReplyToMessageId(replyToId?: string | null): number | undefined {
-  if (!replyToId) {
-    return undefined;
-  }
-  const parsed = Number.parseInt(replyToId, 10);
-  return Number.isFinite(parsed) ? parsed : undefined;
-}
-
 function parseIntegerId(value: string): number | undefined {
   if (!/^-?\d+$/.test(value)) {
     return undefined;
@@ -14,6 +6,21 @@ function parseIntegerId(value: string): number | undefined {
   return Number.isFinite(parsed) ? parsed : undefined;
 }
 
+export function normalizeTelegramReplyToMessageId(value: unknown): number | undefined {
+  if (typeof value === "number") {
+    return Number.isFinite(value) ? Math.trunc(value) : undefined;
+  }
+  if (typeof value !== "string") {
+    return undefined;
+  }
+  const trimmed = value.trim();
+  return trimmed ? parseIntegerId(trimmed) : undefined;
+}
+
+export function parseTelegramReplyToMessageId(replyToId?: string | null): number | undefined {
+  return normalizeTelegramReplyToMessageId(replyToId);
+}
+
 export function parseTelegramThreadId(threadId?: string | number | null): number | undefined {
   if (threadId == null) {
     return undefined;
diff --git a/extensions/telegram/src/send.test.ts b/extensions/telegram/src/send.test.ts
index 4d3b90eb891..9a3c8c364cf 100644
--- a/extensions/telegram/src/send.test.ts
+++ b/extensions/telegram/src/send.test.ts
@@ -1919,6 +1919,50 @@ describe("shared send behaviors", () => {
     }
   });
 
+  it("omits invalid reply_to_message_id values before calling Telegram", async () => {
+    const invalidReplyToMessageIds = ["session-meta-id", "123abc", Number.NaN] as const;
+
+    for (const invalidReplyToMessageId of invalidReplyToMessageIds) {
+      const chatId = "123";
+      const sendMessage = vi.fn().mockResolvedValue({
+        message_id: 56,
+        chat: { id: chatId },
+      });
+      const sendSticker = vi.fn().mockResolvedValue({
+        message_id: 102,
+        chat: { id: chatId },
+      });
+      const api = { sendMessage, sendSticker } as unknown as {
+        sendMessage: typeof sendMessage;
+        sendSticker: typeof sendSticker;
+      };
+
+      await sendMessageTelegram(chatId, "reply text", {
+        token: "tok",
+        api,
+        replyToMessageId: invalidReplyToMessageId as unknown as number,
+      });
+      await sendStickerTelegram(chatId, "CAACAgIAAxkBAAI...sticker_file_id", {
+        token: "tok",
+        api,
+        replyToMessageId: invalidReplyToMessageId as unknown as number,
+      });
+
+      expect(sendMessage, String(invalidReplyToMessageId)).toHaveBeenCalledWith(
+        chatId,
+        "reply text",
+        {
+          parse_mode: "HTML",
+        },
+      );
+      expect(sendSticker, String(invalidReplyToMessageId)).toHaveBeenCalledWith(
+        chatId,
+        "CAACAgIAAxkBAAI...sticker_file_id",
+        undefined,
+      );
+    }
+  });
+
   it("wraps chat-not-found with actionable context", async () => {
     const cases = [
       {
diff --git a/extensions/telegram/src/send.ts b/extensions/telegram/src/send.ts
index dc7082b5866..fa0f1607bde 100644
--- a/extensions/telegram/src/send.ts
+++ b/extensions/telegram/src/send.ts
@@ -42,6 +42,7 @@ import {
   normalizeTelegramLookupTarget,
   parseTelegramTarget,
 } from "./targets.js";
+import { normalizeTelegramReplyToMessageId } from "./outbound-params.js";
 import { resolveTelegramVoiceSend } from "./voice.js";
 
 type TelegramApi = Bot["api"];
@@ -416,8 +417,8 @@ function buildTelegramThreadReplyParams(params: {
   const threadIdParams = buildTelegramThreadParams(threadSpec);
   const threadParams: TelegramThreadReplyParams = threadIdParams ? { ...threadIdParams } : {};
 
-  if (params.replyToMessageId != null) {
-    const replyToMessageId = Math.trunc(params.replyToMessageId);
+  const replyToMessageId = normalizeTelegramReplyToMessageId(params.replyToMessageId);
+  if (replyToMessageId != null) {
     if (params.quoteText?.trim()) {
       threadParams.reply_parameters = {
         message_id: replyToMessageId,