diff --git a/internal/handler/agent.go b/internal/handler/agent.go
index ae05ba1f..7baf58cf 100644
--- a/internal/handler/agent.go
+++ b/internal/handler/agent.go
@@ -200,9 +200,7 @@ func (h *AgentHandler) CancelRunningTaskForConversation(conversationID string) {
 	if h == nil || conversationID == "" || h.tasks == nil {
 		return
 	}
-	if execID := h.tasks.ActiveMCPExecutionID(conversationID); execID != "" {
-		h.agent.CancelMCPToolExecutionWithNote(execID, "")
-	}
+	h.cancelActiveMCPToolForConversation(conversationID)
 	if ok, err := h.tasks.CancelTask(conversationID, ErrTaskCancelled); ok {
 		h.logger.Info("已取消会话运行中任务", zap.String("conversationId", conversationID))
 	} else if err != nil {
@@ -210,6 +208,15 @@ func (h *AgentHandler) CancelRunningTaskForConversation(conversationID string) {
 	}
 }
 
+func (h *AgentHandler) cancelActiveMCPToolForConversation(conversationID string) {
+	if h == nil || h.tasks == nil || h.agent == nil {
+		return
+	}
+	if execID := h.tasks.ActiveMCPExecutionID(conversationID); execID != "" {
+		h.agent.CancelMCPToolExecutionWithNote(execID, "")
+	}
+}
+
 // HitlToolWhitelistSaver 合并 HITL 免审批工具到全局配置并落盘
 type HitlToolWhitelistSaver interface {
 	MergeHitlToolWhitelistIntoConfig(add []string) error
@@ -239,6 +246,7 @@ func NewAgentHandler(agent *agent.Agent, db *database.DB, cfg *config.Config, lo
 		hitlManager:      NewHITLManager(db, logger),
 		batchCronParser:  cron.NewParser(cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow | cron.Descriptor),
 	}
+	tm.SetToolCanceler(handler.cancelActiveMCPToolForConversation)
 	if err := handler.hitlManager.EnsureSchema(); err != nil {
 		logger.Warn("初始化 HITL 表失败", zap.Error(err))
 	}
@@ -1411,6 +1419,7 @@ func (h *AgentHandler) CancelAgentLoop(c *gin.Context) {
 
 	var cause error = ErrTaskCancelled
 	msg := "已提交取消请求，任务将在当前步骤完成后停止。"
+	h.cancelActiveMCPToolForConversation(req.ConversationID)
 	ok, err := h.tasks.CancelTask(req.ConversationID, cause)
 	if err != nil {
 		h.logger.Error("取消任务失败", zap.Error(err))
diff --git a/internal/handler/project_context.go b/internal/handler/project_context.go
index ef8eb7e5..ca2664bc 100644
--- a/internal/handler/project_context.go
+++ b/internal/handler/project_context.go
@@ -7,7 +7,7 @@ import (
 	"go.uber.org/zap"
 )
 
-// agentSessionContextBlock 注入会话工作目录与项目黑板（用于 system prompt 追加块）。
+// agentSessionContextBlock 注入会话工作目录、项目黑板与用户原文锚点（用于 system prompt 追加块）。
 func (h *AgentHandler) agentSessionContextBlock(conversationID string) string {
 	var parts []string
 	if ws := h.buildWorkspaceBlock(conversationID); ws != "" {
@@ -16,6 +16,9 @@ func (h *AgentHandler) agentSessionContextBlock(conversationID string) string {
 	if bb := h.projectBlackboardBlock(conversationID); bb != "" {
 		parts = append(parts, bb)
 	}
+	if uv := h.userVerbatimAnchorBlock(conversationID); uv != "" {
+		parts = append(parts, uv)
+	}
 	return strings.Join(parts, "\n\n")
 }
 
@@ -67,6 +70,29 @@ func (h *AgentHandler) projectBlackboardBlock(conversationID string) string {
 	return strings.TrimSpace(block)
 }
 
+// userVerbatimAnchorBlock 从 messages 表构建用户各轮原文锚点（压缩后仍由 summarization Finalize 刷新）。
+func (h *AgentHandler) userVerbatimAnchorBlock(conversationID string) string {
+	if h == nil || h.db == nil || h.config == nil {
+		return ""
+	}
+	conversationID = strings.TrimSpace(conversationID)
+	if conversationID == "" {
+		return ""
+	}
+	maxRunes := h.config.MultiAgent.UserVerbatimAnchorMaxRunesEffective()
+	if maxRunes < 0 {
+		return ""
+	}
+	msgs, err := h.db.GetMessages(conversationID)
+	if err != nil {
+		if h.logger != nil {
+			h.logger.Warn("构建用户原文锚点失败", zap.String("conversationId", conversationID), zap.Error(err))
+		}
+		return ""
+	}
+	return project.BuildUserVerbatimAnchorBlockFromMessages(msgs, maxRunes)
+}
+
 // conversationProjectID 返回对话绑定的项目 ID；未绑定或查询失败时返回空字符串。
 func (h *AgentHandler) conversationProjectID(conversationID string) string {
 	if h == nil || h.db == nil {
diff --git a/internal/handler/task_manager.go b/internal/handler/task_manager.go
index a40c4123..bfaea31b 100644
--- a/internal/handler/task_manager.go
+++ b/internal/handler/task_manager.go
@@ -247,6 +247,8 @@ type AgentTaskManager struct {
 	maxHistorySize   int              // 最大历史记录数
 	historyRetention time.Duration    // 历史记录保留时间
 	eventBus         *TaskEventBus    // 可选：任务结束时关闭镜像 SSE 订阅
+	// toolCanceler 在用户整轮停止任务时终止当前 MCP 工具（非「中断并继续」）。
+	toolCanceler func(conversationID string)
 }
 
 const (
@@ -277,6 +279,13 @@ func (m *AgentTaskManager) SetTaskEventBus(b *TaskEventBus) {
 	m.eventBus = b
 }
 
+// SetToolCanceler 设置整轮停止任务时终止当前 MCP 工具的回调（由 AgentHandler 注入）。
+func (m *AgentTaskManager) SetToolCanceler(fn func(conversationID string)) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.toolCanceler = fn
+}
+
 // GetTask 返回运行中任务（无则 nil）。
 func (m *AgentTaskManager) GetTask(conversationID string) *AgentTask {
 	m.mu.RLock()
@@ -372,14 +381,21 @@ func (m *AgentTaskManager) CancelTask(conversationID string, cause error) (bool,
 		task.InterruptContinueNote = ""
 	}
 	cancel := task.cancel
-	m.mu.Unlock()
-
 	if cause == nil {
 		cause = ErrTaskCancelled
 	}
+	var toolCanceler func(string)
+	if errors.Is(cause, ErrTaskCancelled) {
+		toolCanceler = m.toolCanceler
+	}
+	m.mu.Unlock()
+
 	if cancel != nil {
 		cancel(cause)
 	}
+	if toolCanceler != nil {
+		toolCanceler(conversationID)
+	}
 	return true, nil
 }
 
diff --git a/internal/handler/task_manager_tool_cancel_test.go b/internal/handler/task_manager_tool_cancel_test.go
new file mode 100644
index 00000000..20c3a076
--- /dev/null
+++ b/internal/handler/task_manager_tool_cancel_test.go
@@ -0,0 +1,80 @@
+package handler
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"cyberstrike-ai/internal/multiagent"
+)
+
+func TestCancelTaskInvokesToolCancelerOnFullStop(t *testing.T) {
+	tm := NewAgentTaskManager()
+	called := false
+	tm.SetToolCanceler(func(conversationID string) {
+		if conversationID == "conv-1" {
+			called = true
+		}
+	})
+
+	_, cancel := context.WithCancelCause(context.Background())
+	_, err := tm.StartTask("conv-1", "hello", cancel)
+	if err != nil {
+		t.Fatalf("StartTask: %v", err)
+	}
+
+	ok, err := tm.CancelTask("conv-1", ErrTaskCancelled)
+	if err != nil || !ok {
+		t.Fatalf("CancelTask: ok=%v err=%v", ok, err)
+	}
+	if !called {
+		t.Fatal("expected tool canceler to be invoked on full task cancel")
+	}
+}
+
+func TestCancelTaskSkipsToolCancelerOnInterruptContinue(t *testing.T) {
+	tm := NewAgentTaskManager()
+	called := false
+	tm.SetToolCanceler(func(conversationID string) {
+		called = true
+	})
+
+	_, cancel := context.WithCancelCause(context.Background())
+	_, err := tm.StartTask("conv-1", "hello", cancel)
+	if err != nil {
+		t.Fatalf("StartTask: %v", err)
+	}
+
+	ok, err := tm.CancelTask("conv-1", multiagent.ErrInterruptContinue)
+	if err != nil || !ok {
+		t.Fatalf("CancelTask: ok=%v err=%v", ok, err)
+	}
+	if called {
+		t.Fatal("tool canceler must not run for interrupt-continue")
+	}
+}
+
+func TestCancelTaskDefaultCauseIsTaskCancelled(t *testing.T) {
+	tm := NewAgentTaskManager()
+	var gotCause error
+	tm.SetToolCanceler(func(conversationID string) {
+		if conversationID == "conv-2" {
+			gotCause = ErrTaskCancelled
+		}
+	})
+
+	ctx, cancel := context.WithCancelCause(context.Background())
+	if _, err := tm.StartTask("conv-2", "hello", cancel); err != nil {
+		t.Fatalf("StartTask: %v", err)
+	}
+
+	if _, err := tm.CancelTask("conv-2", nil); err != nil {
+		t.Fatalf("CancelTask: %v", err)
+	}
+	if !errors.Is(context.Cause(ctx), ErrTaskCancelled) {
+		t.Fatalf("expected ErrTaskCancelled cause, got %v", context.Cause(ctx))
+	}
+	if gotCause != ErrTaskCancelled {
+		t.Fatalf("expected tool canceler path for default cancel cause")
+	}
+}