diff --git a/extensions/qqbot/src/engine/api/messages.ts b/extensions/qqbot/src/engine/api/messages.ts
index 9e98342516f..36a5cee9e3e 100644
--- a/extensions/qqbot/src/engine/api/messages.ts
+++ b/extensions/qqbot/src/engine/api/messages.ts
@@ -291,6 +291,3 @@ export interface Credentials {
   appId: string;
   clientSecret: string;
 }
-
-// Re-export getNextMsgSeq for consumers that import from messages.ts.
-export { getNextMsgSeq } from "./routes.js";
diff --git a/extensions/qqbot/src/engine/api/retry.ts b/extensions/qqbot/src/engine/api/retry.ts
index c7fdbf6f07b..623ac3d2327 100644
--- a/extensions/qqbot/src/engine/api/retry.ts
+++ b/extensions/qqbot/src/engine/api/retry.ts
@@ -211,7 +211,7 @@ export function buildPartFinishPersistentPolicy(
 }
 
 /** Business error codes that trigger persistent part-finish retry. */
-export const PART_FINISH_RETRYABLE_CODES: Set<number> = new Set([40093001]);
+const PART_FINISH_RETRYABLE_CODES: Set<number> = new Set([40093001]);
 
 /** upload_prepare error code indicating daily limit exceeded. */
 export const UPLOAD_PREPARE_FALLBACK_CODE = 40093002;
diff --git a/extensions/qqbot/src/engine/messaging/outbound-deliver.ts b/extensions/qqbot/src/engine/messaging/outbound-deliver.ts
index 3ab34ab8c24..87fc033210d 100644
--- a/extensions/qqbot/src/engine/messaging/outbound-deliver.ts
+++ b/extensions/qqbot/src/engine/messaging/outbound-deliver.ts
@@ -73,7 +73,7 @@ export interface DeliverDeps {
 // ---- Exported types ----
 
 /** Maximum text length for a single QQ Bot message. */
-export const TEXT_CHUNK_LIMIT = 5000;
+const TEXT_CHUNK_LIMIT = 5000;
 
 export interface DeliverEventContext {
   type: "c2c" | "guild" | "dm" | "group";
diff --git a/extensions/qqbot/src/engine/messaging/sender.ts b/extensions/qqbot/src/engine/messaging/sender.ts
index 02c5d58eb53..82b5fbecebc 100644
--- a/extensions/qqbot/src/engine/messaging/sender.ts
+++ b/extensions/qqbot/src/engine/messaging/sender.ts
@@ -803,6 +803,6 @@ export function accountToCreds(account: { appId: string; clientSecret: string })
 }
 
 /** Check whether a target type supports rich media (C2C and Group only). */
-export function supportsRichMedia(targetType: string): boolean {
+function supportsRichMedia(targetType: string): boolean {
   return targetType === "c2c" || targetType === "group";
 }
diff --git a/extensions/qqbot/src/engine/messaging/streaming-media-send.ts b/extensions/qqbot/src/engine/messaging/streaming-media-send.ts
index 77dc854545d..45f81e059e8 100644
--- a/extensions/qqbot/src/engine/messaging/streaming-media-send.ts
+++ b/extensions/qqbot/src/engine/messaging/streaming-media-send.ts
@@ -31,11 +31,11 @@ export interface SendQueueItem {
 }
 
 /** 统一的媒体标签正则 — 匹配标准化后的 6 种标签 */
-export const MEDIA_TAG_REGEX =
+const MEDIA_TAG_REGEX =
   /<(qqimg|qqvoice|qqvideo|qqfile|qqmedia|img)>([^<>]+)<\/(?:qqimg|qqvoice|qqvideo|qqfile|qqmedia|img)>/gi;
 
 /** 创建一个新的全局标签正则实例（每次调用 reset lastIndex） */
-export function createMediaTagRegex(): RegExp {
+function createMediaTagRegex(): RegExp {
   return new RegExp(MEDIA_TAG_REGEX.source, MEDIA_TAG_REGEX.flags);
 }
 
@@ -70,7 +70,7 @@ export interface MediaSendContext {
  * 此方法在 gateway.ts deliver 回调、outbound.ts sendText、
  * streaming.ts sendMediaQueue 中共用。
  */
-export function fixPathEncoding(
+function fixPathEncoding(
   mediaPath: string,
   log?: { debug?: (msg: string) => void; error?: (msg: string) => void },
 ): string {
@@ -133,7 +133,7 @@ export function fixPathEncoding(
  * @param position 要检测的位置（字符索引）
  * @returns 如果 position 在围栏代码块内返回 true
  */
-export function isInsideCodeBlock(text: string, position: number): boolean {
+function isInsideCodeBlock(text: string, position: number): boolean {
   const fenceRegex = /^(`{3,})[^\n]*$/gm;
   let fenceMatch: RegExpExecArray | null;
   let openFence: { pos: number; ticks: number } | null = null;
diff --git a/extensions/qqbot/src/engine/tools/channel-api.ts b/extensions/qqbot/src/engine/tools/channel-api.ts
index d5f2f600b65..3e7c6cad0a7 100644
--- a/extensions/qqbot/src/engine/tools/channel-api.ts
+++ b/extensions/qqbot/src/engine/tools/channel-api.ts
@@ -63,7 +63,7 @@ export const ChannelApiSchema = {
  * Build the full API URL from base + path + query params.
  * 拼接 API 基地址 + 路径 + 查询参数。
  */
-export function buildUrl(path: string, query?: Record<string, string>): string {
+function buildUrl(path: string, query?: Record<string, string>): string {
   let url = `${API_BASE}${path}`;
   if (query && Object.keys(query).length > 0) {
     const params = new URLSearchParams();
@@ -84,7 +84,7 @@ export function buildUrl(path: string, query?: Record<string, string>): string {
  * Validate API path format; returns an error string or null if valid.
  * 校验 API 路径格式，返回错误描述或 null（合法）。
  */
-export function validatePath(path: string): string | null {
+function validatePath(path: string): string | null {
   if (!path.startsWith("/")) {
     return "path must start with /";
   }