feat: add multi-turn conversation memory to Agent

- Add chatHistory store (in-memory, per user, last 20 messages)
- Agent now passes full conversation context to LLM via CallWithRequest
- Records both user messages and assistant responses
- Add /clear command to reset conversation history
- Add 'Clear' quick action button in frontend
- Supports natural multi-turn conversations (follow-up questions, context)

agent/agent.go

@@ -29,6 +29,7 @@ type Agent struct {
 	brain         *Brain
 	scheduler     *Scheduler
 	logger        *slog.Logger
+	history       *chatHistory
 	NotifyFunc    func(userID int64, text string) error
 }
 
@@ -50,7 +51,7 @@ func DefaultConfig() *Config {
 
 func New(tm *manager.TraderManager, st *store.Store, cfg *Config, logger *slog.Logger) *Agent {
 	if cfg == nil { cfg = DefaultConfig() }
-	return &Agent{traderManager: tm, store: st, config: cfg, logger: logger}
+	return &Agent{traderManager: tm, store: st, config: cfg, logger: logger, history: newChatHistory(20)}
 }
 
 func (a *Agent) SetAIClient(c mcp.AIClient) { a.aiClient = c }
@@ -124,6 +125,13 @@ func (a *Agent) HandleMessage(ctx context.Context, userID int64, text string) (s
 	if text == "/status" {
 		return a.handleStatus(lang), nil
 	}
+	if text == "/clear" {
+		a.history.Clear(userID)
+		if lang == "zh" {
+			return "🧹 对话记忆已清除。", nil
+		}
+		return "🧹 Conversation history cleared.", nil
+	}
 
 	// EVERYTHING else → LLM with tools
 	return a.thinkAndAct(ctx, userID, lang, text)
@@ -147,13 +155,32 @@ func (a *Agent) thinkAndAct(ctx context.Context, userID int64, lang, text string
 		userPrompt = text + "\n\n---\n[NOFXi System Context - real-time data for reference]\n" + enrichment
 	}
 
-	// Call LLM
-	resp, err := a.aiClient.CallWithMessages(systemPrompt, userPrompt)
+	// Build messages with conversation history
+	messages := []mcp.Message{mcp.NewSystemMessage(systemPrompt)}
+
+	// Add conversation history (up to last N messages)
+	history := a.history.Get(userID)
+	for _, msg := range history {
+		messages = append(messages, mcp.NewMessage(msg.Role, msg.Content))
+	}
+
+	// Add current user message
+	messages = append(messages, mcp.NewUserMessage(userPrompt))
+
+	// Record user message in history
+	a.history.Add(userID, "user", text)
+
+	// Call LLM with full conversation context
+	req := &mcp.Request{Messages: messages}
+	resp, err := a.aiClient.CallWithRequest(req)
 	if err != nil {
 		a.logger.Error("LLM call failed", "error", err)
 		return a.noAIFallback(lang, text)
 	}
 
+	// Record assistant response in history
+	a.history.Add(userID, "assistant", resp)
+
 	return resp, nil
 }
 

agent/history.go

@@ -0,0 +1,86 @@
+package agent
+
+import (
+	"sync"
+	"time"
+)
+
+// chatMessage represents a single message in conversation history.
+type chatMessage struct {
+	Role      string    `json:"role"` // "user" or "assistant"
+	Content   string    `json:"content"`
+	Timestamp time.Time `json:"timestamp"`
+}
+
+// chatHistory stores conversation history per user.
+type chatHistory struct {
+	mu       sync.RWMutex
+	sessions map[int64][]chatMessage
+	maxTurns int // max messages per user (user+assistant pairs)
+}
+
+func newChatHistory(maxTurns int) *chatHistory {
+	if maxTurns <= 0 {
+		maxTurns = 20 // default: keep last 20 messages (10 turns)
+	}
+	return &chatHistory{
+		sessions: make(map[int64][]chatMessage),
+		maxTurns: maxTurns,
+	}
+}
+
+// Add appends a message to the user's history.
+func (h *chatHistory) Add(userID int64, role, content string) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	h.sessions[userID] = append(h.sessions[userID], chatMessage{
+		Role:      role,
+		Content:   content,
+		Timestamp: time.Now(),
+	})
+
+	// Trim to maxTurns
+	msgs := h.sessions[userID]
+	if len(msgs) > h.maxTurns {
+		h.sessions[userID] = msgs[len(msgs)-h.maxTurns:]
+	}
+}
+
+// Get returns the conversation history for a user.
+func (h *chatHistory) Get(userID int64) []chatMessage {
+	h.mu.RLock()
+	defer h.mu.RUnlock()
+
+	msgs := h.sessions[userID]
+	if msgs == nil {
+		return nil
+	}
+	// Return a copy
+	result := make([]chatMessage, len(msgs))
+	copy(result, msgs)
+	return result
+}
+
+// Clear resets conversation history for a user.
+func (h *chatHistory) Clear(userID int64) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	delete(h.sessions, userID)
+}
+
+// CleanOld removes sessions older than the given duration.
+func (h *chatHistory) CleanOld(maxAge time.Duration) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	now := time.Now()
+	for uid, msgs := range h.sessions {
+		if len(msgs) > 0 {
+			lastMsg := msgs[len(msgs)-1]
+			if now.Sub(lastMsg.Timestamp) > maxAge {
+				delete(h.sessions, uid)
+			}
+		}
+	}
+}

web/src/pages/AgentChatPage.tsx

@@ -238,6 +238,7 @@ export function AgentChatPage() {
           { label: '💼 持仓', cmd: '/positions' },
           { label: '💰 余额', cmd: '/balance' },
           { label: '📋 Traders', cmd: '/traders' },
+          { label: '🧹 清除记忆', cmd: '/clear' },
           { label: '❓ 帮助', cmd: '/help' },
         ]
       : [
@@ -246,6 +247,7 @@ export function AgentChatPage() {
           { label: '💼 Positions', cmd: '/positions' },
           { label: '💰 Balance', cmd: '/balance' },
           { label: '📋 Traders', cmd: '/traders' },
+          { label: '🧹 Clear', cmd: '/clear' },
           { label: '❓ Help', cmd: '/help' },
         ]