diff --git a/extensions/feishu/src/comment-shared.ts b/extensions/feishu/src/comment-shared.ts
index 1ae0976a687..41ce3c178e5 100644
--- a/extensions/feishu/src/comment-shared.ts
+++ b/extensions/feishu/src/comment-shared.ts
@@ -1,5 +1,4 @@
 import {
-  asOptionalRecord,
   hasNonEmptyString as sharedHasNonEmptyString,
   isRecord as sharedIsRecord,
   normalizeOptionalString,
@@ -25,8 +24,6 @@ export const normalizeString = normalizeOptionalString;
 
 export const isRecord = sharedIsRecord;
 
-export const asRecord = asOptionalRecord;
-
 export const hasNonEmptyString = sharedHasNonEmptyString;
 
 export function formatFeishuApiError(
@@ -359,10 +356,6 @@ export function parseCommentContentElements(params: {
   };
 }
 
-export function extractCommentElementText(element: unknown): string | undefined {
-  return parseCommentContentElements({ elements: [element] }).plainText;
-}
-
 export function extractReplyText(
   reply: { content?: { elements?: unknown[] } } | undefined,
 ): string | undefined {
diff --git a/extensions/feishu/src/mention.ts b/extensions/feishu/src/mention.ts
index 86d4e2ad06d..8d477827203 100644
--- a/extensions/feishu/src/mention.ts
+++ b/extensions/feishu/src/mention.ts
@@ -83,20 +83,6 @@ export function isMentionForwardRequest(event: FeishuMessageEvent, botOpenId?: s
   return hasBotMention && hasOtherMention;
 }
 
-/**
- * Extract message body from text (remove @ placeholders)
- */
-export function extractMessageBody(text: string, allMentionKeys: string[]): string {
-  let result = text;
-
-  // Remove all @ placeholders
-  for (const key of allMentionKeys) {
-    result = result.replace(new RegExp(escapeRegExp(key), "g"), "");
-  }
-
-  return result.replace(/\s+/g, " ").trim();
-}
-
 /**
  * Format @mention for text message
  */
@@ -104,13 +90,6 @@ export function formatMentionForText(target: MentionTarget): string {
   return `<at user_id="${target.openId}">${target.name}</at>`;
 }
 
-/**
- * Format @everyone for text message
- */
-export function formatMentionAllForText(): string {
-  return `<at user_id="all">Everyone</at>`;
-}
-
 /**
  * Format @mention for card message (lark_md)
  */
@@ -118,13 +97,6 @@ export function formatMentionForCard(target: MentionTarget): string {
   return `<at id=${target.openId}></at>`;
 }
 
-/**
- * Format @everyone for card message
- */
-export function formatMentionAllForCard(): string {
-  return `<at id=all></at>`;
-}
-
 /**
  * Build complete message with @mentions (text format)
  */
diff --git a/extensions/feishu/src/monitor.startup.ts b/extensions/feishu/src/monitor.startup.ts
index 2c684038ff1..378cff41dd2 100644
--- a/extensions/feishu/src/monitor.startup.ts
+++ b/extensions/feishu/src/monitor.startup.ts
@@ -72,11 +72,3 @@ export async function fetchBotIdentityForMonitor(
   }
   return {};
 }
-
-export async function fetchBotOpenIdForMonitor(
-  account: ResolvedFeishuAccount,
-  options: FetchBotOpenIdOptions = {},
-): Promise<string | undefined> {
-  const identity = await fetchBotIdentityForMonitor(account, options);
-  return identity.botOpenId;
-}
diff --git a/extensions/feishu/src/targets.ts b/extensions/feishu/src/targets.ts
index 7f64ca1f1db..dd2c6b29934 100644
--- a/extensions/feishu/src/targets.ts
+++ b/extensions/feishu/src/targets.ts
@@ -53,17 +53,6 @@ export function normalizeFeishuTarget(raw: string): string | null {
   return withoutProvider;
 }
 
-export function formatFeishuTarget(id: string, type?: FeishuIdType): string {
-  const trimmed = id.trim();
-  if (type === "chat_id" || trimmed.startsWith(CHAT_ID_PREFIX)) {
-    return `chat:${trimmed}`;
-  }
-  if (type === "open_id" || trimmed.startsWith(OPEN_ID_PREFIX)) {
-    return `user:${trimmed}`;
-  }
-  return trimmed;
-}
-
 export function resolveReceiveIdType(id: string): "chat_id" | "open_id" | "user_id" {
   const trimmed = id.trim();
   const lowered = normalizeLowercaseStringOrEmpty(trimmed);
diff --git a/extensions/googlechat/src/auth.ts b/extensions/googlechat/src/auth.ts
index 54e68146500..8de0737d137 100644
--- a/extensions/googlechat/src/auth.ts
+++ b/extensions/googlechat/src/auth.ts
@@ -199,8 +199,6 @@ export async function verifyGoogleChatRequest(params: {
   return { ok: false, reason: "unsupported audience type" };
 }
 
-export const GOOGLE_CHAT_SCOPE = CHAT_SCOPE;
-
 export const __testing = {
   resetGoogleChatAuthForTests(): void {
     authCache.clear();
diff --git a/extensions/googlechat/src/monitor.ts b/extensions/googlechat/src/monitor.ts
index 5e744289938..aa66233e2e8 100644
--- a/extensions/googlechat/src/monitor.ts
+++ b/extensions/googlechat/src/monitor.ts
@@ -433,7 +433,3 @@ export function resolveGoogleChatWebhookPath(params: {
     }) ?? "/googlechat"
   );
 }
-
-export function computeGoogleChatMediaMaxMb(params: { account: ResolvedGoogleChatAccount }) {
-  return params.account.config.mediaMaxMb ?? 20;
-}
diff --git a/extensions/qqbot/src/engine/messaging/streaming-media-send.ts b/extensions/qqbot/src/engine/messaging/streaming-media-send.ts
index a962ee239c7..77dc854545d 100644
--- a/extensions/qqbot/src/engine/messaging/streaming-media-send.ts
+++ b/extensions/qqbot/src/engine/messaging/streaming-media-send.ts
@@ -6,7 +6,6 @@
  */
 
 import type { GatewayAccount } from "../types.js";
-import { normalizeMediaTags } from "../utils/media-tags.js";
 import { normalizePath } from "../utils/platform.js";
 import {
   sendPhoto,
@@ -161,21 +160,6 @@ export function isInsideCodeBlock(text: string, position: number): boolean {
 
 // ============ 媒体标签解析 ============
 
-/**
- * 检测文本是否包含富媒体标签（忽略代码块内的标签）
- */
-export function hasMediaTags(text: string): boolean {
-  const normalized = normalizeMediaTags(text);
-  const regex = createMediaTagRegex();
-  let match: RegExpExecArray | null;
-  while ((match = regex.exec(normalized)) !== null) {
-    if (!isInsideCodeBlock(normalized, match.index)) {
-      return true;
-    }
-  }
-  return false;
-}
-
 /** findFirstClosedMediaTag 的返回值 */
 export interface FirstClosedMediaTag {
   /** 标签前的纯文本 */