diff --git a/internal/app/app.go b/internal/app/app.go
index 1901b1d5..ae6d2c60 100644
--- a/internal/app/app.go
+++ b/internal/app/app.go
@@ -298,7 +298,8 @@ func New(cfg *config.Config, log *logger.Logger, configPath string) (*App, error
 	plantaskBase := filepath.Join(skillsDir, plantaskRel)
 	// Match eino_adk_run_loop: checkpoint_dir is used as configured (relative to process CWD when not absolute).
 	checkpointBase := strings.TrimSpace(cfg.MultiAgent.EinoMiddleware.CheckpointDir)
-	db.SetEinoConversationDirs(plantaskBase, checkpointBase)
+	reductionRoot := strings.TrimSpace(cfg.MultiAgent.EinoMiddleware.ReductionRootDir)
+	db.SetEinoConversationDirs(plantaskBase, checkpointBase, reductionRoot)
 	agent.SetPromptBaseDir(configDir)
 
 	agentsDir := cfg.AgentsDir
diff --git a/internal/database/conversation.go b/internal/database/conversation.go
index 1803912a..94458f02 100644
--- a/internal/database/conversation.go
+++ b/internal/database/conversation.go
@@ -585,12 +585,14 @@ func (db *DB) DeleteConversation(id string) error {
 		// 不返回错误，继续删除对话
 	}
 
+	projectID, _ := db.GetConversationProjectID(id)
+
 	// 删除对话（外键CASCADE会自动删除其他相关数据）
 	_, err = db.Exec("DELETE FROM conversations WHERE id = ?", id)
 	if err != nil {
 		return fmt.Errorf("删除对话失败: %w", err)
 	}
-	db.removeConversationScopedDirs(id)
+	db.removeConversationScopedDirs(id, projectID)
 
 	db.logger.Info("对话已删除（漏洞记录已保留）", zap.String("conversationId", id))
 	return nil
@@ -628,13 +630,35 @@ func (db *DB) removeConversationScopedDir(base, conversationID, label string) {
 	}
 }
 
-func (db *DB) removeConversationScopedDirs(conversationID string) {
-	// summarization transcript, reduction files, etc.
+func (db *DB) einoReductionBaseDir() string {
+	if db == nil {
+		return ""
+	}
+	if base := strings.TrimSpace(db.einoReductionRootDir); base != "" {
+		return base
+	}
+	return filepath.Join("tmp", "reduction")
+}
+
+func (db *DB) removeConversationScopedDirs(conversationID, projectID string) {
+	// summarization transcript, etc.
 	db.removeConversationScopedDir(db.conversationArtifactsDir, conversationID, "conversation_artifacts")
 	// Eino plantask JSON boards (skills_dir/.eino/plantask/<id>/).
 	db.removeConversationScopedDir(db.einoPlantaskBaseDir, conversationID, "plantask")
 	// Eino ADK runner checkpoints (checkpoint_dir/<id>/).
 	db.removeConversationScopedDir(db.einoCheckpointBaseDir, conversationID, "eino_checkpoint")
+	// Eino reduction persisted tool outputs (tmp/reduction/conversations/<id>/).
+	// Project-bound sessions share projects/<id>/ — skip on single conversation delete.
+	if strings.TrimSpace(projectID) == "" {
+		reductionBase := filepath.Join(db.einoReductionBaseDir(), "conversations")
+		db.removeConversationScopedDir(reductionBase, conversationID, "reduction")
+	}
+}
+
+func (db *DB) removeProjectScopedDirs(projectID string) {
+	// Eino reduction persisted tool outputs (tmp/reduction/projects/<id>/).
+	reductionBase := filepath.Join(db.einoReductionBaseDir(), "projects")
+	db.removeConversationScopedDir(reductionBase, projectID, "reduction")
 }
 
 // SaveAgentTrace 保存最后一轮代理消息轨迹与助手输出摘要。
diff --git a/internal/database/conversation_cleanup_test.go b/internal/database/conversation_cleanup_test.go
index 8a2371ab..77e9cfe9 100644
--- a/internal/database/conversation_cleanup_test.go
+++ b/internal/database/conversation_cleanup_test.go
@@ -19,7 +19,8 @@ func TestDeleteConversationRemovesEinoScopedDirs(t *testing.T) {
 
 	plantaskBase := filepath.Join(tmp, "skills", ".eino", "plantask")
 	checkpointBase := filepath.Join(tmp, "eino-checkpoints")
-	db.SetEinoConversationDirs(plantaskBase, checkpointBase)
+	reductionBase := filepath.Join(tmp, "reduction")
+	db.SetEinoConversationDirs(plantaskBase, checkpointBase, reductionBase)
 
 	conv, err := db.CreateConversation("cleanup test", ConversationCreateMeta{})
 	if err != nil {
@@ -34,6 +35,7 @@ func TestDeleteConversationRemovesEinoScopedDirs(t *testing.T) {
 		{db.conversationArtifactsDir, "transcript.txt"},
 		{plantaskBase, "task-1.json"},
 		{checkpointBase, "runner-deep.ckpt"},
+		{filepath.Join(reductionBase, "conversations"), "tool-output.txt"},
 	} {
 		dir := filepath.Join(base.root, seg)
 		if err := os.MkdirAll(dir, 0o755); err != nil {
@@ -48,10 +50,45 @@ func TestDeleteConversationRemovesEinoScopedDirs(t *testing.T) {
 		t.Fatalf("DeleteConversation: %v", err)
 	}
 
-	for _, base := range []string{db.conversationArtifactsDir, plantaskBase, checkpointBase} {
+	for _, base := range []string{db.conversationArtifactsDir, plantaskBase, checkpointBase, filepath.Join(reductionBase, "conversations")} {
 		dir := filepath.Join(base, seg)
 		if _, statErr := os.Stat(dir); !os.IsNotExist(statErr) {
 			t.Fatalf("expected removed dir %s, stat err=%v", dir, statErr)
 		}
 	}
 }
+
+func TestDeleteProjectRemovesReductionDir(t *testing.T) {
+	tmp := t.TempDir()
+	dbPath := filepath.Join(tmp, "conversations.db")
+	db, err := NewDB(dbPath, zap.NewNop())
+	if err != nil {
+		t.Fatalf("NewDB: %v", err)
+	}
+	defer db.Close()
+
+	reductionBase := filepath.Join(tmp, "reduction")
+	db.SetEinoConversationDirs("", "", reductionBase)
+
+	project, err := db.CreateProject(&Project{Name: "cleanup test"})
+	if err != nil {
+		t.Fatalf("CreateProject: %v", err)
+	}
+	seg := sanitizeConversationPathSegment(project.ID)
+	reductionDir := filepath.Join(reductionBase, "projects", seg, "clear")
+	if err := os.MkdirAll(reductionDir, 0o755); err != nil {
+		t.Fatalf("mkdir %s: %v", reductionDir, err)
+	}
+	if err := os.WriteFile(filepath.Join(reductionDir, "call-1.txt"), []byte("x"), 0o644); err != nil {
+		t.Fatalf("write: %v", err)
+	}
+
+	if err := db.DeleteProject(project.ID); err != nil {
+		t.Fatalf("DeleteProject: %v", err)
+	}
+
+	projectReductionDir := filepath.Join(reductionBase, "projects", seg)
+	if _, statErr := os.Stat(projectReductionDir); !os.IsNotExist(statErr) {
+		t.Fatalf("expected removed dir %s, stat err=%v", projectReductionDir, statErr)
+	}
+}
diff --git a/internal/database/database.go b/internal/database/database.go
index 89246101..0ffbd2b8 100644
--- a/internal/database/database.go
+++ b/internal/database/database.go
@@ -51,6 +51,7 @@ type DB struct {
 	conversationArtifactsDir string
 	einoPlantaskBaseDir      string // skills_dir + plantask_rel_dir (per-conversation subdirs)
 	einoCheckpointBaseDir    string // checkpoint_dir root (per-conversation subdirs)
+	einoReductionRootDir     string // reduction_root_dir or default tmp/reduction (conversations/<id> subdirs)
 	checkpointLoopName       string
 	checkpointStop           chan struct{}
 	checkpointDone           chan struct{}
@@ -159,12 +160,14 @@ func NewDB(dbPath string, logger *zap.Logger) (*DB, error) {
 
 // SetEinoConversationDirs configures best-effort filesystem cleanup on DeleteConversation.
 // plantaskBase is skills_root/plantask_rel (no conversation id); checkpointBase is checkpoint_dir root.
-func (db *DB) SetEinoConversationDirs(plantaskBase, checkpointBase string) {
+// reductionRoot is reduction_root_dir from config; empty uses tmp/reduction (conversation-scoped subdirs only).
+func (db *DB) SetEinoConversationDirs(plantaskBase, checkpointBase, reductionRoot string) {
 	if db == nil {
 		return
 	}
 	db.einoPlantaskBaseDir = strings.TrimSpace(plantaskBase)
 	db.einoCheckpointBaseDir = strings.TrimSpace(checkpointBase)
+	db.einoReductionRootDir = strings.TrimSpace(reductionRoot)
 }
 
 // initTables 初始化数据库表
diff --git a/internal/database/project.go b/internal/database/project.go
index d0524be8..701389a7 100644
--- a/internal/database/project.go
+++ b/internal/database/project.go
@@ -195,6 +195,7 @@ func (db *DB) DeleteProject(id string) error {
 	if err != nil {
 		return fmt.Errorf("删除项目失败: %w", err)
 	}
+	db.removeProjectScopedDirs(id)
 	return nil
 }