模型优化

main.go

@@ -42,7 +42,8 @@ const (
 JSON 格式：{"tools":[{"name":"工具名称","reason":"..."}],"reason":"..."}
 工具名称必须来自“可用工具”列表。
 可以选择多个工具，工具会按配置顺序依次执行；后面的工具可以使用前面工具写入的上下文。
-如果用户问题包含今天、明天、昨天、本周、本月、本年、最近等相对时间，并且还需要查询数据库，请同时选择 time 和 sql。
+如果用户问题包含今天、今日、明天、昨天、本周、本月、本年、最近等相对时间，且还需要调用 search 或 sql，必须同时选择 time，并让 time 排在这些工具之前。
+例如“历史上的今天都发生了什么”应选择 time 和 search：先获取今天的绝对日期，再搜索当天历史事件；如果联网无结果，主模型会回退到自身知识库回答并说明来源。
 例如“本月有什么日程安排”应选择 time 和 sql：先获取本月绝对日期范围，再查询日程表。
 如果无需工具，返回 {"tools":[],"reason":"..."}。
 只选择确实必要的工具。`
@@ -1104,8 +1105,8 @@ func runSearchTool(ctx context.Context, state *searchagent.State, messages []Cha
 	}
 	if len(results) == 0 {
 		err := errors.New("未搜索到相关网页结果")
-		emit(chatSSEFrame{Type: "trace", Tool: "search", Stage: "results", Status: "error", Message: err.Error()})
-		return prependHiddenContext(messages, searchagent.BuildErrorContext(query, err)), nil
+		emit(chatSSEFrame{Type: "trace", Tool: "search", Stage: "results", Status: "warning", Message: "未搜索到相关网页结果，将使用模型知识库回答"})
+		return prependHiddenContext(messages, searchagent.BuildFallbackContext(profile, query, routeReason, err)), nil
 	}
 	emit(chatSSEFrame{Type: "trace", Tool: "search", Stage: "results", Status: "success", Message: fmt.Sprintf("联网搜索完成，找到 %d 条结果", len(results)), Data: map[string]any{"provider": profile.Provider, "count": len(results)}})
 	return prependHiddenContext(messages, searchagent.BuildResultContext(profile, query, results, routeReason)), nil
@@ -1130,6 +1131,7 @@ func enrichMessagesWithRoutedTools(ctx context.Context, chatProfile *OpenAIProfi
 		return messages, err
 	}
 	selected := filterToolSelections(decision, tools, toolRouterState.cfg.Tools)
+	selected = ensureTimeSelectionForRelativeQuery(selected, tools, toolRouterState.cfg.Tools, latestUserQuery(messages))
 	if len(selected) == 0 {
 		emit(chatSSEFrame{Type: "trace", Tool: "tool_router", Stage: "route", Status: "success", Message: "工具路由结果：无需调用工具", Data: map[string]any{"reason": decision.Reason}})
 		return messages, nil
@@ -1239,6 +1241,47 @@ func filterToolSelections(decision ToolRoutingDecision, tools map[string]ChatToo
 			selected[item.Name] = item
 		}
 	}
+	return orderToolSelections(selected, order)
+}
+
+func ensureTimeSelectionForRelativeQuery(selected []ToolSelection, tools map[string]ChatTool, order []ToolRouteConfig, query string) []ToolSelection {
+	if !containsRelativeTime(query) || hasToolSelection(selected, "time") || (!hasToolSelection(selected, "search") && !hasToolSelection(selected, "sql")) {
+		return selected
+	}
+	if _, ok := tools["time"]; !ok {
+		return selected
+	}
+	withTime := make(map[string]ToolSelection, len(selected)+1)
+	for _, item := range selected {
+		withTime[item.Name] = item
+	}
+	withTime["time"] = ToolSelection{Name: "time", Reason: "问题包含相对日期，需要先获取当前日期"}
+	return orderToolSelections(withTime, order)
+}
+
+func containsRelativeTime(query string) bool {
+	query = strings.TrimSpace(query)
+	if query == "" {
+		return false
+	}
+	for _, keyword := range []string{"今天", "今日", "明天", "昨天", "本周", "这周", "本月", "这个月", "本年", "今年", "最近", "历史上的今天"} {
+		if strings.Contains(query, keyword) {
+			return true
+		}
+	}
+	return false
+}
+
+func hasToolSelection(selected []ToolSelection, name string) bool {
+	for _, item := range selected {
+		if item.Name == name {
+			return true
+		}
+	}
+	return false
+}
+
+func orderToolSelections(selected map[string]ToolSelection, order []ToolRouteConfig) []ToolSelection {
 	result := make([]ToolSelection, 0, len(selected))
 	for _, item := range order {
 		if selection, ok := selected[item.Name]; ok {