diff --git a/agent/src/prompts/system.ts b/agent/src/prompts/system.ts
index bdbfb5e6..4931dc35 100644
--- a/agent/src/prompts/system.ts
+++ b/agent/src/prompts/system.ts
@@ -62,21 +62,7 @@ ${quote('/data')} is your HOME, you are allowed to read and write files in it, t
 - ${quote('read')}: read file content
 - ${quote('write')}: write file content
 - ${quote('list')}: list directory entries
-- ${quote('edit')}: replace exact text in a file. Input format:
-
-${block([
-  '{',
-  '  "path": "relative/path/to/file.txt",',
-  '  "old_text": "exact text to find (must match exactly)",',
-  '  "new_text": "replacement text"',
-  '}',
-].join('\n'))}
-
-  Rules:
-  - ${quote('old_text')} must be unique in the file
-  - Matching is exact (including whitespace and newlines)
-  - If multiple occurrences exist, include more context in ${quote('old_text')}
-
+- ${quote('edit')}: replace exact text in a file
 - ${quote('exec')}: execute command
 
 ## Every Session
@@ -96,6 +82,13 @@ Before anything else:
 
 For memory more previous, please use ${quote('search_memory')} tool.
 
+## Message
+
+There are tools you can use in some channels:
+
+- ${quote('send')}: send message to a channel or session
+- ${quote('react')}: add or remove emoji reaction
+
 ## Contacts
 
 You may receive messages from many people or bots (like yourself), They are from different channels.
diff --git a/cmd/agent/main.go b/cmd/agent/main.go
index 40b6b1a1..6ba1bcf3 100644
--- a/cmd/agent/main.go
+++ b/cmd/agent/main.go
@@ -345,7 +345,7 @@ func provideContainerdHandler(log *slog.Logger, service ctr.Service, cfg config.
 }
 
 func provideToolGatewayService(log *slog.Logger, cfg config.Config, channelManager *channel.Manager, registry *channel.Registry, channelService *channel.Service, scheduleService *schedule.Service, memoryService *memory.Service, chatService *conversation.Service, accountService *accounts.Service, manager *mcp.Manager, containerdHandler *handlers.ContainerdHandler, mcpConnService *mcp.ConnectionService) *mcp.ToolGatewayService {
-	messageExec := mcpmessage.NewExecutor(log, channelManager, registry)
+	messageExec := mcpmessage.NewExecutor(log, channelManager, channelManager, registry)
 	directoryExec := mcpdirectory.NewExecutor(log, registry, channelService, registry)
 	scheduleExec := mcpschedule.NewExecutor(log, scheduleService)
 	memoryExec := mcpmemory.NewExecutor(log, memoryService, chatService, accountService)
diff --git a/internal/channel/adapter.go b/internal/channel/adapter.go
index c04f5f1f..7343b138 100644
--- a/internal/channel/adapter.go
+++ b/internal/channel/adapter.go
@@ -103,6 +103,12 @@ type MessageEditor interface {
 	Unsend(ctx context.Context, cfg ChannelConfig, target string, messageID string) error
 }
 
+// Reactor adds or removes emoji reactions on messages.
+type Reactor interface {
+	React(ctx context.Context, cfg ChannelConfig, target string, messageID string, emoji string) error
+	Unreact(ctx context.Context, cfg ChannelConfig, target string, messageID string, emoji string) error
+}
+
 // SelfDiscoverer retrieves the adapter bot's own identity from the platform.
 // The returned map is merged into ChannelConfig.SelfIdentity and persisted.
 type SelfDiscoverer interface {
diff --git a/internal/channel/adapters/feishu/feishu.go b/internal/channel/adapters/feishu/feishu.go
index 702a6938..9b8c4630 100644
--- a/internal/channel/adapters/feishu/feishu.go
+++ b/internal/channel/adapters/feishu/feishu.go
@@ -203,6 +203,32 @@ func (a *FeishuAdapter) processingReactionGateway(cfg channel.ChannelConfig) (pr
 	return gateway, nil
 }
 
+// React adds an emoji reaction to a message (implements channel.Reactor).
+// The target parameter is unused for Feishu; reactions are keyed by message_id.
+func (a *FeishuAdapter) React(ctx context.Context, cfg channel.ChannelConfig, _ string, messageID string, emoji string) error {
+	gateway, err := a.processingReactionGateway(cfg)
+	if err != nil {
+		return err
+	}
+	_, err = gateway.Add(ctx, messageID, emoji)
+	return err
+}
+
+// Unreact removes the bot's reaction from a message (implements channel.Reactor).
+// For Feishu, this requires the reaction_id which we don't have here, so we pass
+// the emoji as reaction_id. If the caller stored the reaction_id from React, they
+// should pass it as emoji. This is a best-effort operation.
+func (a *FeishuAdapter) Unreact(ctx context.Context, cfg channel.ChannelConfig, _ string, messageID string, reactionID string) error {
+	if strings.TrimSpace(reactionID) == "" {
+		return nil
+	}
+	gateway, err := a.processingReactionGateway(cfg)
+	if err != nil {
+		return err
+	}
+	return gateway.Remove(ctx, messageID, reactionID)
+}
+
 func addProcessingReaction(ctx context.Context, gateway processingReactionGateway, messageID, reactionType string) (string, error) {
 	if gateway == nil {
 		return "", fmt.Errorf("processing reaction gateway is nil")
diff --git a/internal/channel/adapters/telegram/telegram.go b/internal/channel/adapters/telegram/telegram.go
index f0cfab44..78fa5cee 100644
--- a/internal/channel/adapters/telegram/telegram.go
+++ b/internal/channel/adapters/telegram/telegram.go
@@ -839,13 +839,10 @@ func truncateTelegramText(text string) string {
 	return text[:limit] + suffix
 }
 
-const processingReactionEmoji = "👀"
-
-// ProcessingStarted adds a reaction to the user's message to indicate processing.
+// ProcessingStarted sends a "typing" chat action to indicate processing.
 func (a *TelegramAdapter) ProcessingStarted(ctx context.Context, cfg channel.ChannelConfig, msg channel.InboundMessage, info channel.ProcessingStatusInfo) (channel.ProcessingStatusHandle, error) {
 	chatID := strings.TrimSpace(info.ReplyTarget)
-	messageID := strings.TrimSpace(info.SourceMessageID)
-	if chatID == "" || messageID == "" {
+	if chatID == "" {
 		return channel.ProcessingStatusHandle{}, nil
 	}
 	telegramCfg, err := parseConfig(cfg.Credentials)
@@ -856,39 +853,30 @@ func (a *TelegramAdapter) ProcessingStarted(ctx context.Context, cfg channel.Cha
 	if err != nil {
 		return channel.ProcessingStatusHandle{}, err
 	}
-	if err := setTelegramReaction(bot, chatID, messageID, processingReactionEmoji); err != nil {
-		if a.logger != nil {
-			a.logger.Warn("add processing reaction failed", slog.String("config_id", cfg.ID), slog.Any("error", err))
-		}
-		return channel.ProcessingStatusHandle{}, nil
+	if err := sendTelegramTyping(bot, chatID); err != nil && a.logger != nil {
+		a.logger.Warn("send typing action failed", slog.String("config_id", cfg.ID), slog.Any("error", err))
 	}
-	return channel.ProcessingStatusHandle{Token: processingReactionEmoji}, nil
+	return channel.ProcessingStatusHandle{}, nil
 }
 
-// ProcessingCompleted removes the processing reaction after reply is sent.
+// ProcessingCompleted is a no-op for Telegram (typing indicator clears automatically).
 func (a *TelegramAdapter) ProcessingCompleted(ctx context.Context, cfg channel.ChannelConfig, msg channel.InboundMessage, info channel.ProcessingStatusInfo, handle channel.ProcessingStatusHandle) error {
-	if handle.Token == "" {
-		return nil
-	}
-	chatID := strings.TrimSpace(info.ReplyTarget)
-	messageID := strings.TrimSpace(info.SourceMessageID)
-	if chatID == "" || messageID == "" {
-		return nil
-	}
-	telegramCfg, err := parseConfig(cfg.Credentials)
-	if err != nil {
-		return err
-	}
-	bot, err := a.getOrCreateBot(telegramCfg.BotToken, cfg.ID)
-	if err != nil {
-		return err
-	}
-	return clearTelegramReaction(bot, chatID, messageID)
+	return nil
 }
 
-// ProcessingFailed removes the processing reaction on failure.
+// ProcessingFailed is a no-op for Telegram (typing indicator clears automatically).
 func (a *TelegramAdapter) ProcessingFailed(ctx context.Context, cfg channel.ChannelConfig, msg channel.InboundMessage, info channel.ProcessingStatusInfo, handle channel.ProcessingStatusHandle, cause error) error {
-	return a.ProcessingCompleted(ctx, cfg, msg, info, handle)
+	return nil
+}
+
+func sendTelegramTyping(bot *tgbotapi.BotAPI, chatID string) error {
+	chatIDInt, err := strconv.ParseInt(chatID, 10, 64)
+	if err != nil {
+		return err
+	}
+	action := tgbotapi.NewChatAction(chatIDInt, tgbotapi.ChatTyping)
+	_, err = bot.Request(action)
+	return err
 }
 
 func setTelegramReaction(bot *tgbotapi.BotAPI, chatID, messageID, emoji string) error {
@@ -908,3 +896,30 @@ func clearTelegramReaction(bot *tgbotapi.BotAPI, chatID, messageID string) error
 	_, err := bot.MakeRequest("setMessageReaction", params)
 	return err
 }
+
+// React adds an emoji reaction to a message (implements channel.Reactor).
+func (a *TelegramAdapter) React(ctx context.Context, cfg channel.ChannelConfig, target string, messageID string, emoji string) error {
+	telegramCfg, err := parseConfig(cfg.Credentials)
+	if err != nil {
+		return err
+	}
+	bot, err := a.getOrCreateBot(telegramCfg.BotToken, cfg.ID)
+	if err != nil {
+		return err
+	}
+	return setTelegramReaction(bot, target, messageID, emoji)
+}
+
+// Unreact removes the bot's reaction from a message (implements channel.Reactor).
+// The emoji parameter is ignored; Telegram clears all bot reactions at once.
+func (a *TelegramAdapter) Unreact(ctx context.Context, cfg channel.ChannelConfig, target string, messageID string, _ string) error {
+	telegramCfg, err := parseConfig(cfg.Credentials)
+	if err != nil {
+		return err
+	}
+	bot, err := a.getOrCreateBot(telegramCfg.BotToken, cfg.ID)
+	if err != nil {
+		return err
+	}
+	return clearTelegramReaction(bot, target, messageID)
+}
diff --git a/internal/channel/inbound/channel.go b/internal/channel/inbound/channel.go
index cb4b9847..f4b9e11f 100644
--- a/internal/channel/inbound/channel.go
+++ b/internal/channel/inbound/channel.go
@@ -797,7 +797,7 @@ func collectMessageToolContext(registry *channel.Registry, messages []conversati
 	suppressReplies := false
 	for _, msg := range messages {
 		for _, tc := range msg.ToolCalls {
-			if tc.Function.Name != "send_message" {
+			if tc.Function.Name != "send" && tc.Function.Name != "send_message" {
 				continue
 			}
 			var args sendMessageToolArgs
diff --git a/internal/channel/manager.go b/internal/channel/manager.go
index 94b0647d..f67d2cba 100644
--- a/internal/channel/manager.go
+++ b/internal/channel/manager.go
@@ -224,6 +224,48 @@ func (m *Manager) Send(ctx context.Context, botID string, channelType ChannelTyp
 	return nil
 }
 
+// React adds or removes an emoji reaction on a channel message.
+func (m *Manager) React(ctx context.Context, botID string, channelType ChannelType, req ReactRequest) error {
+	if m.service == nil {
+		return fmt.Errorf("channel manager not configured")
+	}
+	reactor, ok := m.registry.GetReactor(channelType)
+	if !ok {
+		return fmt.Errorf("channel %s does not support reactions", channelType)
+	}
+	config, err := m.service.ResolveEffectiveConfig(ctx, botID, channelType)
+	if err != nil {
+		return err
+	}
+	target := strings.TrimSpace(req.Target)
+	if target == "" {
+		return fmt.Errorf("target is required for reactions")
+	}
+	if normalized, ok := m.registry.NormalizeTarget(channelType, target); ok {
+		target = normalized
+	}
+	messageID := strings.TrimSpace(req.MessageID)
+	if messageID == "" {
+		return fmt.Errorf("message_id is required for reactions")
+	}
+	emoji := strings.TrimSpace(req.Emoji)
+	if !req.Remove && emoji == "" {
+		return fmt.Errorf("emoji is required when adding a reaction")
+	}
+	if m.logger != nil {
+		m.logger.Info("react outbound",
+			slog.String("channel", channelType.String()),
+			slog.String("bot_id", botID),
+			slog.String("message_id", messageID),
+			slog.Bool("remove", req.Remove),
+		)
+	}
+	if req.Remove {
+		return reactor.Unreact(ctx, config, target, messageID, emoji)
+	}
+	return reactor.React(ctx, config, target, messageID, emoji)
+}
+
 // Shutdown cancels the inbound worker pool and stops all active connections.
 func (m *Manager) Shutdown(ctx context.Context) error {
 	if m.inboundCancel != nil {
diff --git a/internal/channel/registry.go b/internal/channel/registry.go
index df53e260..1bfa8015 100644
--- a/internal/channel/registry.go
+++ b/internal/channel/registry.go
@@ -216,6 +216,16 @@ func (r *Registry) GetMessageEditor(channelType ChannelType) (MessageEditor, boo
 	return editor, ok
 }
 
+// GetReactor returns the Reactor for the given channel type, or nil if unsupported.
+func (r *Registry) GetReactor(channelType ChannelType) (Reactor, bool) {
+	adapter, ok := r.Get(channelType)
+	if !ok {
+		return nil, false
+	}
+	reactor, ok := adapter.(Reactor)
+	return reactor, ok
+}
+
 // GetReceiver returns the Receiver for the given channel type, or nil if unsupported.
 func (r *Registry) GetReceiver(channelType ChannelType) (Receiver, bool) {
 	adapter, ok := r.Get(channelType)
diff --git a/internal/channel/types.go b/internal/channel/types.go
index c0b66dec..d54e88a6 100644
--- a/internal/channel/types.go
+++ b/internal/channel/types.go
@@ -350,3 +350,11 @@ type SendRequest struct {
 	ChannelIdentityID string  `json:"channel_identity_id,omitempty"`
 	Message           Message `json:"message"`
 }
+
+// ReactRequest is the input for adding or removing an emoji reaction on a message.
+type ReactRequest struct {
+	Target    string `json:"target"`
+	MessageID string `json:"message_id"`
+	Emoji     string `json:"emoji"`
+	Remove    bool   `json:"remove,omitempty"`
+}
diff --git a/internal/mcp/providers/message/provider.go b/internal/mcp/providers/message/provider.go
index 81911da2..218f63f6 100644
--- a/internal/mcp/providers/message/provider.go
+++ b/internal/mcp/providers/message/provider.go
@@ -11,41 +11,54 @@ import (
 	mcpgw "github.com/memohai/memoh/internal/mcp"
 )
 
-const toolSendMessage = "send_message"
+const (
+	toolSend  = "send"
+	toolReact = "react"
+)
 
+// Sender sends outbound messages through channel manager.
 type Sender interface {
 	Send(ctx context.Context, botID string, channelType channel.ChannelType, req channel.SendRequest) error
 }
 
+// Reactor adds or removes emoji reactions through channel manager.
+type Reactor interface {
+	React(ctx context.Context, botID string, channelType channel.ChannelType, req channel.ReactRequest) error
+}
+
+// ChannelTypeResolver parses platform name to channel type.
 type ChannelTypeResolver interface {
 	ParseChannelType(raw string) (channel.ChannelType, error)
 }
 
+// Executor exposes send and react as MCP tools.
 type Executor struct {
 	sender   Sender
+	reactor  Reactor
 	resolver ChannelTypeResolver
 	logger   *slog.Logger
 }
 
-func NewExecutor(log *slog.Logger, sender Sender, resolver ChannelTypeResolver) *Executor {
+// NewExecutor creates a message tool executor.
+// reactor may be nil; the react tool will not be listed when reactor is unavailable.
+func NewExecutor(log *slog.Logger, sender Sender, reactor Reactor, resolver ChannelTypeResolver) *Executor {
 	if log == nil {
 		log = slog.Default()
 	}
 	return &Executor{
 		sender:   sender,
+		reactor:  reactor,
 		resolver: resolver,
 		logger:   log.With(slog.String("provider", "message_tool")),
 	}
 }
 
 func (p *Executor) ListTools(ctx context.Context, session mcpgw.ToolSessionContext) ([]mcpgw.ToolDescriptor, error) {
-	if p.sender == nil || p.resolver == nil {
-		return []mcpgw.ToolDescriptor{}, nil
-	}
-	return []mcpgw.ToolDescriptor{
-		{
-			Name:        toolSendMessage,
-			Description: "Send a message to a channel or session",
+	var tools []mcpgw.ToolDescriptor
+	if p.sender != nil && p.resolver != nil {
+		tools = append(tools, mcpgw.ToolDescriptor{
+			Name:        toolSend,
+			Description: "Send a message to a channel or session. Supports text, structured messages, attachments, and replies.",
 			InputSchema: map[string]any{
 				"type": "object",
 				"properties": map[string]any{
@@ -73,6 +86,10 @@ func (p *Executor) ListTools(ctx context.Context, session mcpgw.ToolSessionConte
 						"type":        "string",
 						"description": "Message text shortcut when message object is omitted",
 					},
+					"reply_to": map[string]any{
+						"type":        "string",
+						"description": "Message ID to reply to. The reply will reference this message on the platform.",
+					},
 					"message": map[string]any{
 						"type":        "object",
 						"description": "Structured message payload with text/parts/attachments",
@@ -80,37 +97,70 @@ func (p *Executor) ListTools(ctx context.Context, session mcpgw.ToolSessionConte
 				},
 				"required": []string{},
 			},
-		},
-	}, nil
+		})
+	}
+	if p.reactor != nil && p.resolver != nil {
+		tools = append(tools, mcpgw.ToolDescriptor{
+			Name:        toolReact,
+			Description: "Add or remove an emoji reaction on a channel message",
+			InputSchema: map[string]any{
+				"type": "object",
+				"properties": map[string]any{
+					"bot_id": map[string]any{
+						"type":        "string",
+						"description": "Bot ID, optional and defaults to current bot",
+					},
+					"platform": map[string]any{
+						"type":        "string",
+						"description": "Channel platform name. Defaults to current session platform.",
+					},
+					"target": map[string]any{
+						"type":        "string",
+						"description": "Channel target (chat/group ID). Defaults to current session reply target.",
+					},
+					"message_id": map[string]any{
+						"type":        "string",
+						"description": "The message ID to react to",
+					},
+					"emoji": map[string]any{
+						"type":        "string",
+						"description": "Emoji to react with (e.g. 👍, ❤️). Required when adding a reaction.",
+					},
+					"remove": map[string]any{
+						"type":        "boolean",
+						"description": "If true, remove the reaction instead of adding it. Default false.",
+					},
+				},
+				"required": []string{"message_id"},
+			},
+		})
+	}
+	return tools, nil
 }
 
 func (p *Executor) CallTool(ctx context.Context, session mcpgw.ToolSessionContext, toolName string, arguments map[string]any) (map[string]any, error) {
-	if toolName != toolSendMessage {
+	switch toolName {
+	case toolSend:
+		return p.callSend(ctx, session, arguments)
+	case toolReact:
+		return p.callReact(ctx, session, arguments)
+	default:
 		return nil, mcpgw.ErrToolNotFound
 	}
+}
+
+// --- send ---
+
+func (p *Executor) callSend(ctx context.Context, session mcpgw.ToolSessionContext, arguments map[string]any) (map[string]any, error) {
 	if p.sender == nil || p.resolver == nil {
 		return mcpgw.BuildToolErrorResult("message service not available"), nil
 	}
 
-	botID := mcpgw.FirstStringArg(arguments, "bot_id")
-	if botID == "" {
-		botID = strings.TrimSpace(session.BotID)
+	botID, err := p.resolveBotID(arguments, session)
+	if err != nil {
+		return mcpgw.BuildToolErrorResult(err.Error()), nil
 	}
-	if botID == "" {
-		return mcpgw.BuildToolErrorResult("bot_id is required"), nil
-	}
-	if strings.TrimSpace(session.BotID) != "" && botID != strings.TrimSpace(session.BotID) {
-		return mcpgw.BuildToolErrorResult("bot_id mismatch"), nil
-	}
-
-	platform := mcpgw.FirstStringArg(arguments, "platform")
-	if platform == "" {
-		platform = strings.TrimSpace(session.CurrentPlatform)
-	}
-	if platform == "" {
-		return mcpgw.BuildToolErrorResult("platform is required"), nil
-	}
-	channelType, err := p.resolver.ParseChannelType(platform)
+	channelType, err := p.resolvePlatform(arguments, session)
 	if err != nil {
 		return mcpgw.BuildToolErrorResult(err.Error()), nil
 	}
@@ -121,6 +171,11 @@ func (p *Executor) CallTool(ctx context.Context, session mcpgw.ToolSessionContex
 		return mcpgw.BuildToolErrorResult(parseErr.Error()), nil
 	}
 
+	// Attach reply reference if reply_to is provided.
+	if replyTo := mcpgw.FirstStringArg(arguments, "reply_to"); replyTo != "" {
+		outboundMessage.Reply = &channel.ReplyRef{MessageID: replyTo}
+	}
+
 	target := mcpgw.FirstStringArg(arguments, "target")
 	if target == "" {
 		target = strings.TrimSpace(session.ReplyTarget)
@@ -136,7 +191,7 @@ func (p *Executor) CallTool(ctx context.Context, session mcpgw.ToolSessionContex
 		Message:           outboundMessage,
 	}
 	if err := p.sender.Send(ctx, botID, channelType, sendReq); err != nil {
-		p.logger.Warn("send message failed", slog.Any("error", err), slog.String("bot_id", botID), slog.String("platform", platform))
+		p.logger.Warn("send failed", slog.Any("error", err), slog.String("bot_id", botID), slog.String("platform", string(channelType)))
 		return mcpgw.BuildToolErrorResult(err.Error()), nil
 	}
 
@@ -151,6 +206,92 @@ func (p *Executor) CallTool(ctx context.Context, session mcpgw.ToolSessionContex
 	return mcpgw.BuildToolSuccessResult(payload), nil
 }
 
+// --- react ---
+
+func (p *Executor) callReact(ctx context.Context, session mcpgw.ToolSessionContext, arguments map[string]any) (map[string]any, error) {
+	if p.reactor == nil || p.resolver == nil {
+		return mcpgw.BuildToolErrorResult("reaction service not available"), nil
+	}
+
+	botID, err := p.resolveBotID(arguments, session)
+	if err != nil {
+		return mcpgw.BuildToolErrorResult(err.Error()), nil
+	}
+	channelType, err := p.resolvePlatform(arguments, session)
+	if err != nil {
+		return mcpgw.BuildToolErrorResult(err.Error()), nil
+	}
+
+	target := mcpgw.FirstStringArg(arguments, "target")
+	if target == "" {
+		target = strings.TrimSpace(session.ReplyTarget)
+	}
+	if target == "" {
+		return mcpgw.BuildToolErrorResult("target is required"), nil
+	}
+
+	messageID := mcpgw.FirstStringArg(arguments, "message_id")
+	if messageID == "" {
+		return mcpgw.BuildToolErrorResult("message_id is required"), nil
+	}
+
+	emoji := mcpgw.FirstStringArg(arguments, "emoji")
+	remove, _, _ := mcpgw.BoolArg(arguments, "remove")
+
+	reactReq := channel.ReactRequest{
+		Target:    target,
+		MessageID: messageID,
+		Emoji:     emoji,
+		Remove:    remove,
+	}
+	if err := p.reactor.React(ctx, botID, channelType, reactReq); err != nil {
+		p.logger.Warn("react failed", slog.Any("error", err), slog.String("bot_id", botID), slog.String("platform", string(channelType)))
+		return mcpgw.BuildToolErrorResult(err.Error()), nil
+	}
+
+	action := "added"
+	if remove {
+		action = "removed"
+	}
+	payload := map[string]any{
+		"ok":         true,
+		"bot_id":     botID,
+		"platform":   channelType.String(),
+		"target":     target,
+		"message_id": messageID,
+		"emoji":      emoji,
+		"action":     action,
+	}
+	return mcpgw.BuildToolSuccessResult(payload), nil
+}
+
+// --- shared helpers ---
+
+func (p *Executor) resolveBotID(arguments map[string]any, session mcpgw.ToolSessionContext) (string, error) {
+	botID := mcpgw.FirstStringArg(arguments, "bot_id")
+	if botID == "" {
+		botID = strings.TrimSpace(session.BotID)
+	}
+	if botID == "" {
+		return "", fmt.Errorf("bot_id is required")
+	}
+	if strings.TrimSpace(session.BotID) != "" && botID != strings.TrimSpace(session.BotID) {
+		return "", fmt.Errorf("bot_id mismatch")
+	}
+	return botID, nil
+}
+
+func (p *Executor) resolvePlatform(arguments map[string]any, session mcpgw.ToolSessionContext) (channel.ChannelType, error) {
+	platform := mcpgw.FirstStringArg(arguments, "platform")
+	if platform == "" {
+		platform = strings.TrimSpace(session.CurrentPlatform)
+	}
+	if platform == "" {
+		return "", fmt.Errorf("platform is required")
+	}
+	return p.resolver.ParseChannelType(platform)
+}
+
 func parseOutboundMessage(arguments map[string]any, fallbackText string) (channel.Message, error) {
 	var msg channel.Message
 	if raw, ok := arguments["message"]; ok && raw != nil {
diff --git a/internal/mcp/providers/message/provider_test.go b/internal/mcp/providers/message/provider_test.go
index df6b9fa3..98a775d7 100644
--- a/internal/mcp/providers/message/provider_test.go
+++ b/internal/mcp/providers/message/provider_test.go
@@ -10,10 +10,22 @@ import (
 )
 
 type fakeSender struct {
-	err error
+	err     error
+	lastReq channel.SendRequest
 }
 
 func (f *fakeSender) Send(ctx context.Context, botID string, channelType channel.ChannelType, req channel.SendRequest) error {
+	f.lastReq = req
+	return f.err
+}
+
+type fakeReactor struct {
+	err     error
+	lastReq channel.ReactRequest
+}
+
+func (f *fakeReactor) React(ctx context.Context, botID string, channelType channel.ChannelType, req channel.ReactRequest) error {
+	f.lastReq = req
 	return f.err
 }
 
@@ -29,8 +41,10 @@ func (f *fakeResolver) ParseChannelType(raw string) (channel.ChannelType, error)
 	return f.ct, nil
 }
 
+// --- send tests ---
+
 func TestExecutor_ListTools_NilDeps(t *testing.T) {
-	exec := NewExecutor(nil, nil, nil)
+	exec := NewExecutor(nil, nil, nil, nil)
 	tools, err := exec.ListTools(context.Background(), mcpgw.ToolSessionContext{})
 	if err != nil {
 		t.Fatal(err)
@@ -42,8 +56,28 @@ func TestExecutor_ListTools_NilDeps(t *testing.T) {
 
 func TestExecutor_ListTools(t *testing.T) {
 	sender := &fakeSender{}
+	reactor := &fakeReactor{}
 	resolver := &fakeResolver{ct: channel.ChannelType("feishu")}
-	exec := NewExecutor(nil, sender, resolver)
+	exec := NewExecutor(nil, sender, reactor, resolver)
+	tools, err := exec.ListTools(context.Background(), mcpgw.ToolSessionContext{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(tools) != 2 {
+		t.Fatalf("expected 2 tools, got %d", len(tools))
+	}
+	if tools[0].Name != toolSend {
+		t.Errorf("tool[0] name = %q, want %q", tools[0].Name, toolSend)
+	}
+	if tools[1].Name != toolReact {
+		t.Errorf("tool[1] name = %q, want %q", tools[1].Name, toolReact)
+	}
+}
+
+func TestExecutor_ListTools_OnlySender(t *testing.T) {
+	sender := &fakeSender{}
+	resolver := &fakeResolver{ct: channel.ChannelType("feishu")}
+	exec := NewExecutor(nil, sender, nil, resolver)
 	tools, err := exec.ListTools(context.Background(), mcpgw.ToolSessionContext{})
 	if err != nil {
 		t.Fatal(err)
@@ -51,15 +85,15 @@ func TestExecutor_ListTools(t *testing.T) {
 	if len(tools) != 1 {
 		t.Fatalf("expected 1 tool, got %d", len(tools))
 	}
-	if tools[0].Name != toolSendMessage {
-		t.Errorf("tool name = %q, want %q", tools[0].Name, toolSendMessage)
+	if tools[0].Name != toolSend {
+		t.Errorf("tool name = %q, want %q", tools[0].Name, toolSend)
 	}
 }
 
 func TestExecutor_CallTool_NotFound(t *testing.T) {
 	sender := &fakeSender{}
 	resolver := &fakeResolver{ct: channel.ChannelType("feishu")}
-	exec := NewExecutor(nil, sender, resolver)
+	exec := NewExecutor(nil, sender, nil, resolver)
 	_, err := exec.CallTool(context.Background(), mcpgw.ToolSessionContext{BotID: "bot1"}, "other_tool", nil)
 	if err != mcpgw.ErrToolNotFound {
 		t.Errorf("expected ErrToolNotFound, got %v", err)
@@ -67,8 +101,8 @@ func TestExecutor_CallTool_NotFound(t *testing.T) {
 }
 
 func TestExecutor_CallTool_NilDeps(t *testing.T) {
-	exec := NewExecutor(nil, nil, nil)
-	result, err := exec.CallTool(context.Background(), mcpgw.ToolSessionContext{BotID: "bot1"}, toolSendMessage, map[string]any{
+	exec := NewExecutor(nil, nil, nil, nil)
+	result, err := exec.CallTool(context.Background(), mcpgw.ToolSessionContext{BotID: "bot1"}, toolSend, map[string]any{
 		"platform": "feishu", "target": "t1", "text": "hi",
 	})
 	if err != nil {
@@ -82,8 +116,8 @@ func TestExecutor_CallTool_NilDeps(t *testing.T) {
 func TestExecutor_CallTool_NoBotID(t *testing.T) {
 	sender := &fakeSender{}
 	resolver := &fakeResolver{ct: channel.ChannelType("feishu")}
-	exec := NewExecutor(nil, sender, resolver)
-	result, err := exec.CallTool(context.Background(), mcpgw.ToolSessionContext{}, toolSendMessage, map[string]any{
+	exec := NewExecutor(nil, sender, nil, resolver)
+	result, err := exec.CallTool(context.Background(), mcpgw.ToolSessionContext{}, toolSend, map[string]any{
 		"platform": "feishu", "target": "t1", "text": "hi",
 	})
 	if err != nil {
@@ -97,9 +131,9 @@ func TestExecutor_CallTool_NoBotID(t *testing.T) {
 func TestExecutor_CallTool_BotIDMismatch(t *testing.T) {
 	sender := &fakeSender{}
 	resolver := &fakeResolver{ct: channel.ChannelType("feishu")}
-	exec := NewExecutor(nil, sender, resolver)
+	exec := NewExecutor(nil, sender, nil, resolver)
 	session := mcpgw.ToolSessionContext{BotID: "bot1"}
-	result, err := exec.CallTool(context.Background(), session, toolSendMessage, map[string]any{
+	result, err := exec.CallTool(context.Background(), session, toolSend, map[string]any{
 		"bot_id": "other", "platform": "feishu", "target": "t1", "text": "hi",
 	})
 	if err != nil {
@@ -113,9 +147,9 @@ func TestExecutor_CallTool_BotIDMismatch(t *testing.T) {
 func TestExecutor_CallTool_NoPlatform(t *testing.T) {
 	sender := &fakeSender{}
 	resolver := &fakeResolver{ct: channel.ChannelType("feishu")}
-	exec := NewExecutor(nil, sender, resolver)
+	exec := NewExecutor(nil, sender, nil, resolver)
 	session := mcpgw.ToolSessionContext{BotID: "bot1"}
-	result, err := exec.CallTool(context.Background(), session, toolSendMessage, map[string]any{
+	result, err := exec.CallTool(context.Background(), session, toolSend, map[string]any{
 		"target": "t1", "text": "hi",
 	})
 	if err != nil {
@@ -129,9 +163,9 @@ func TestExecutor_CallTool_NoPlatform(t *testing.T) {
 func TestExecutor_CallTool_PlatformParseError(t *testing.T) {
 	sender := &fakeSender{}
 	resolver := &fakeResolver{err: errors.New("unknown platform")}
-	exec := NewExecutor(nil, sender, resolver)
+	exec := NewExecutor(nil, sender, nil, resolver)
 	session := mcpgw.ToolSessionContext{BotID: "bot1", CurrentPlatform: "feishu"}
-	result, err := exec.CallTool(context.Background(), session, toolSendMessage, map[string]any{
+	result, err := exec.CallTool(context.Background(), session, toolSend, map[string]any{
 		"platform": "bad", "target": "t1", "text": "hi",
 	})
 	if err != nil {
@@ -145,9 +179,9 @@ func TestExecutor_CallTool_PlatformParseError(t *testing.T) {
 func TestExecutor_CallTool_NoMessage(t *testing.T) {
 	sender := &fakeSender{}
 	resolver := &fakeResolver{ct: channel.ChannelType("feishu")}
-	exec := NewExecutor(nil, sender, resolver)
+	exec := NewExecutor(nil, sender, nil, resolver)
 	session := mcpgw.ToolSessionContext{BotID: "bot1"}
-	result, err := exec.CallTool(context.Background(), session, toolSendMessage, map[string]any{
+	result, err := exec.CallTool(context.Background(), session, toolSend, map[string]any{
 		"platform": "feishu", "target": "t1",
 	})
 	if err != nil {
@@ -161,9 +195,9 @@ func TestExecutor_CallTool_NoMessage(t *testing.T) {
 func TestExecutor_CallTool_NoTarget(t *testing.T) {
 	sender := &fakeSender{}
 	resolver := &fakeResolver{ct: channel.ChannelType("feishu")}
-	exec := NewExecutor(nil, sender, resolver)
+	exec := NewExecutor(nil, sender, nil, resolver)
 	session := mcpgw.ToolSessionContext{BotID: "bot1"}
-	result, err := exec.CallTool(context.Background(), session, toolSendMessage, map[string]any{
+	result, err := exec.CallTool(context.Background(), session, toolSend, map[string]any{
 		"platform": "feishu", "text": "hi",
 	})
 	if err != nil {
@@ -177,9 +211,9 @@ func TestExecutor_CallTool_NoTarget(t *testing.T) {
 func TestExecutor_CallTool_SendError(t *testing.T) {
 	sender := &fakeSender{err: errors.New("send failed")}
 	resolver := &fakeResolver{ct: channel.ChannelType("feishu")}
-	exec := NewExecutor(nil, sender, resolver)
+	exec := NewExecutor(nil, sender, nil, resolver)
 	session := mcpgw.ToolSessionContext{BotID: "bot1", ReplyTarget: "t1"}
-	result, err := exec.CallTool(context.Background(), session, toolSendMessage, map[string]any{
+	result, err := exec.CallTool(context.Background(), session, toolSend, map[string]any{
 		"platform": "feishu", "text": "hi",
 	})
 	if err != nil {
@@ -193,9 +227,9 @@ func TestExecutor_CallTool_SendError(t *testing.T) {
 func TestExecutor_CallTool_Success(t *testing.T) {
 	sender := &fakeSender{}
 	resolver := &fakeResolver{ct: channel.ChannelType("feishu")}
-	exec := NewExecutor(nil, sender, resolver)
+	exec := NewExecutor(nil, sender, nil, resolver)
 	session := mcpgw.ToolSessionContext{BotID: "bot1", CurrentPlatform: "feishu", ReplyTarget: "chat1"}
-	result, err := exec.CallTool(context.Background(), session, toolSendMessage, map[string]any{
+	result, err := exec.CallTool(context.Background(), session, toolSend, map[string]any{
 		"text": "hello",
 	})
 	if err != nil {
@@ -216,6 +250,165 @@ func TestExecutor_CallTool_Success(t *testing.T) {
 	}
 }
 
+func TestExecutor_CallTool_ReplyTo(t *testing.T) {
+	sender := &fakeSender{}
+	resolver := &fakeResolver{ct: channel.ChannelType("telegram")}
+	exec := NewExecutor(nil, sender, nil, resolver)
+	session := mcpgw.ToolSessionContext{BotID: "bot1", CurrentPlatform: "telegram", ReplyTarget: "123"}
+	result, err := exec.CallTool(context.Background(), session, toolSend, map[string]any{
+		"text":     "reply text",
+		"reply_to": "msg-789",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := mcpgw.PayloadError(result); err != nil {
+		t.Fatal(err)
+	}
+	if sender.lastReq.Message.Reply == nil {
+		t.Fatal("expected Reply to be set")
+	}
+	if sender.lastReq.Message.Reply.MessageID != "msg-789" {
+		t.Errorf("Reply.MessageID = %q, want %q", sender.lastReq.Message.Reply.MessageID, "msg-789")
+	}
+}
+
+func TestExecutor_CallTool_NoReplyTo(t *testing.T) {
+	sender := &fakeSender{}
+	resolver := &fakeResolver{ct: channel.ChannelType("telegram")}
+	exec := NewExecutor(nil, sender, nil, resolver)
+	session := mcpgw.ToolSessionContext{BotID: "bot1", CurrentPlatform: "telegram", ReplyTarget: "123"}
+	result, err := exec.CallTool(context.Background(), session, toolSend, map[string]any{
+		"text": "no reply",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := mcpgw.PayloadError(result); err != nil {
+		t.Fatal(err)
+	}
+	if sender.lastReq.Message.Reply != nil {
+		t.Error("expected Reply to be nil when reply_to is not provided")
+	}
+}
+
+// --- react tests ---
+
+func TestExecutor_React_NilReactor(t *testing.T) {
+	exec := NewExecutor(nil, nil, nil, nil)
+	result, err := exec.CallTool(context.Background(), mcpgw.ToolSessionContext{BotID: "bot1"}, toolReact, map[string]any{
+		"platform": "telegram", "target": "123", "message_id": "456", "emoji": "👍",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if isErr, _ := result["isError"].(bool); !isErr {
+		t.Error("expected error when reactor is nil")
+	}
+}
+
+func TestExecutor_React_NoMessageID(t *testing.T) {
+	reactor := &fakeReactor{}
+	resolver := &fakeResolver{ct: channel.ChannelType("telegram")}
+	exec := NewExecutor(nil, nil, reactor, resolver)
+	session := mcpgw.ToolSessionContext{BotID: "bot1", CurrentPlatform: "telegram", ReplyTarget: "123"}
+	result, err := exec.CallTool(context.Background(), session, toolReact, map[string]any{
+		"emoji": "👍",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if isErr, _ := result["isError"].(bool); !isErr {
+		t.Error("expected error when message_id is missing")
+	}
+}
+
+func TestExecutor_React_NoTarget(t *testing.T) {
+	reactor := &fakeReactor{}
+	resolver := &fakeResolver{ct: channel.ChannelType("telegram")}
+	exec := NewExecutor(nil, nil, reactor, resolver)
+	session := mcpgw.ToolSessionContext{BotID: "bot1", CurrentPlatform: "telegram"}
+	result, err := exec.CallTool(context.Background(), session, toolReact, map[string]any{
+		"message_id": "456", "emoji": "👍",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if isErr, _ := result["isError"].(bool); !isErr {
+		t.Error("expected error when target is missing")
+	}
+}
+
+func TestExecutor_React_Success(t *testing.T) {
+	reactor := &fakeReactor{}
+	resolver := &fakeResolver{ct: channel.ChannelType("telegram")}
+	exec := NewExecutor(nil, nil, reactor, resolver)
+	session := mcpgw.ToolSessionContext{BotID: "bot1", CurrentPlatform: "telegram", ReplyTarget: "123"}
+	result, err := exec.CallTool(context.Background(), session, toolReact, map[string]any{
+		"message_id": "456", "emoji": "👍",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := mcpgw.PayloadError(result); err != nil {
+		t.Fatal(err)
+	}
+	content, _ := result["structuredContent"].(map[string]any)
+	if content == nil {
+		t.Fatal("no structuredContent")
+	}
+	if content["ok"] != true {
+		t.Errorf("ok = %v", content["ok"])
+	}
+	if content["action"] != "added" {
+		t.Errorf("action = %v", content["action"])
+	}
+	if content["emoji"] != "👍" {
+		t.Errorf("emoji = %v", content["emoji"])
+	}
+}
+
+func TestExecutor_React_Remove(t *testing.T) {
+	reactor := &fakeReactor{}
+	resolver := &fakeResolver{ct: channel.ChannelType("telegram")}
+	exec := NewExecutor(nil, nil, reactor, resolver)
+	session := mcpgw.ToolSessionContext{BotID: "bot1", CurrentPlatform: "telegram", ReplyTarget: "123"}
+	result, err := exec.CallTool(context.Background(), session, toolReact, map[string]any{
+		"message_id": "456", "remove": true,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := mcpgw.PayloadError(result); err != nil {
+		t.Fatal(err)
+	}
+	content, _ := result["structuredContent"].(map[string]any)
+	if content["action"] != "removed" {
+		t.Errorf("action = %v", content["action"])
+	}
+	if reactor.lastReq.Remove != true {
+		t.Error("expected Remove=true in request")
+	}
+}
+
+func TestExecutor_React_Error(t *testing.T) {
+	reactor := &fakeReactor{err: errors.New("reaction failed")}
+	resolver := &fakeResolver{ct: channel.ChannelType("telegram")}
+	exec := NewExecutor(nil, nil, reactor, resolver)
+	session := mcpgw.ToolSessionContext{BotID: "bot1", CurrentPlatform: "telegram", ReplyTarget: "123"}
+	result, err := exec.CallTool(context.Background(), session, toolReact, map[string]any{
+		"message_id": "456", "emoji": "👍",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if isErr, _ := result["isError"].(bool); !isErr {
+		t.Error("expected error when React fails")
+	}
+}
+
+// --- parseOutboundMessage tests ---
+
 func TestParseOutboundMessage(t *testing.T) {
 	tests := []struct {
 		name      string