diff --git a/bot.go b/bot.go
index 64c9b4a..1d9e6da 100644
--- a/bot.go
+++ b/bot.go
@@ -153,7 +153,7 @@ func (bot *Bot) Authorization() string {
 	return "Bot " + bot.AppID + "." + bot.Token
 }
 
-// AtMe 返回 "<@!"+bot.ready.User.ID+">"
+// AtMe 返回 <@!bot.ready.User.ID>
 func (bot *Bot) AtMe() string {
 	return "<@!" + bot.ready.User.ID + ">"
 }
diff --git a/context.go b/context.go
index cf6e90a..e3c43d3 100644
--- a/context.go
+++ b/context.go
@@ -75,13 +75,18 @@ func (ctx *Ctx) CheckSession() Rule {
 
 // Send 发送消息到对方
 func (ctx *Ctx) Send(replytosender bool, post *MessagePost) (*Message, error) {
-	msg := ctx.Value.(*Message)
-	post.ReplyMessageID = msg.ID
-	if replytosender {
-		post.MessageReference = &MessageReference{
-			MessageID: msg.ID,
+	msg, ok := ctx.Value.(*Message)
+	if ok && msg != nil {
+		post.ReplyMessageID = msg.ID
+		if replytosender {
+			post.MessageReference = &MessageReference{
+				MessageID: msg.ID,
+			}
 		}
+	} else {
+		post.ReplyMessageID = "MESSAGE_CREATE"
 	}
+
 	if msg.SrcGuildID != "" { // dms
 		return ctx.Caller.PostMessageToUser(msg.GuildID, post)
 	}
@@ -90,16 +95,20 @@ func (ctx *Ctx) Send(replytosender bool, post *MessagePost) (*Message, error) {
 
 // SendPlainMessage 发送纯文本消息到对方
 func (ctx *Ctx) SendPlainMessage(replytosender bool, printable ...any) (*Message, error) {
-	msg := ctx.Value.(*Message)
-	post := &MessagePost{
-		ReplyMessageID: msg.ID,
-	}
-	if replytosender {
-		post.MessageReference = &MessageReference{
-			MessageID: msg.ID,
+	msg, ok := ctx.Value.(*Message)
+	post := &MessagePost{}
+	if ok && msg != nil {
+		post.ReplyMessageID = msg.ID
+		if replytosender {
+			post.MessageReference = &MessageReference{
+				MessageID: msg.ID,
+			}
 		}
+	} else {
+		post.ReplyMessageID = "MESSAGE_CREATE"
 	}
-	post.Content = fmt.Sprint(printable...)
+
+	post.Content = HideURL(fmt.Sprint(printable...))
 	if msg.SrcGuildID != "" { // dms
 		return ctx.Caller.PostMessageToUser(msg.GuildID, post)
 	}
@@ -108,21 +117,26 @@ func (ctx *Ctx) SendPlainMessage(replytosender bool, printable ...any) (*Message
 
 // SendImage 发送带图片消息到对方
 func (ctx *Ctx) SendImage(file string, replytosender bool, caption ...any) (*Message, error) {
-	msg := ctx.Value.(*Message)
-	post := &MessagePost{
-		ReplyMessageID: msg.ID,
+	msg, ok := ctx.Value.(*Message)
+	post := &MessagePost{}
+	if ok && msg != nil {
+		post.ReplyMessageID = msg.ID
+		if replytosender {
+			post.MessageReference = &MessageReference{
+				MessageID: msg.ID,
+			}
+		}
+	} else {
+		post.ReplyMessageID = "MESSAGE_CREATE"
 	}
+
 	if strings.HasPrefix(file, "http") {
 		post.Image = file
 	} else {
 		post.ImageFile = file
 	}
-	if replytosender {
-		post.MessageReference = &MessageReference{
-			MessageID: msg.ID,
-		}
-	}
-	post.Content = fmt.Sprint(caption...)
+	post.Content = HideURL(fmt.Sprint(caption...))
+
 	if msg.SrcGuildID != "" { // dms
 		return ctx.Caller.PostMessageToUser(msg.GuildID, post)
 	}
diff --git a/helper.go b/helper.go
index 8127ded..e0e7d7b 100644
--- a/helper.go
+++ b/helper.go
@@ -63,6 +63,14 @@ func MessageUnescape(text string) string {
 	return text
 }
 
+// HideURL 转义 URL 以避免审核
+func HideURL(s string) string {
+	s = strings.ReplaceAll(s, ".", "…")
+	s = strings.ReplaceAll(s, "http://", "🔗📄:")
+	s = strings.ReplaceAll(s, "https://", "🔗🔒:")
+	return s
+}
+
 // UnderlineToCamel convert abc_def to AbcDef
 func UnderlineToCamel(s string) string {
 	sb := strings.Builder{}
diff --git a/openapi_user.go b/openapi_user.go
index 47a9c05..25b5d51 100644
--- a/openapi_user.go
+++ b/openapi_user.go
@@ -12,6 +12,11 @@ type User struct {
 	UnionUserAccount string `json:"union_user_account"`
 }
 
+// At 返回 <@!u.ID>
+func (u *User) At() string {
+	return "<@!" + u.ID + ">"
+}
+
 // GetMyInfo 获取当前用户（机器人）详情
 //
 // https://bot.q.qq.com/wiki/develop/api/openapi/user/me.html