diff --git a/electron/harness/tools/built-in/web-search.ts b/electron/harness/tools/built-in/web-search.ts
index 6c17ed7..14f40b3 100644
--- a/electron/harness/tools/built-in/web-search.ts
+++ b/electron/harness/tools/built-in/web-search.ts
@@ -252,18 +252,18 @@ export class WebSearchTool implements IMetonaTool {
     // 读取 SearXNG 配置（提前读取，使工具参数默认值与配置一致）
     const searxngConfig = this.readSearXNGConfig();
 
-    // max_results: 工具参数 > 配置面板 > 默认 30。取较大值保证配置面板的下限约束
+    // max_results: 配置面板为下限，AI 参数不得低于配置值，上限 30
     const argMaxResults = (args.max_results as number) ?? undefined;
     const cfgMaxResults = searxngConfig.max_results > 0 ? searxngConfig.max_results : undefined;
-    const maxResults = Math.min(30, Math.max(1, argMaxResults ?? cfgMaxResults ?? 30));
+    const maxResults = Math.min(30, Math.max(1, argMaxResults ?? 30, cfgMaxResults ?? 0));
 
     const timeRange = (args.time_range as string) ?? '';
     const enhanceSnippets = (args.enhance_snippets as boolean) ?? true;
 
-    // fetch_top: 工具参数 > 配置面板 > 默认 5。取较大值保证配置面板的下限约束
+    // fetch_top: 配置面板为下限，AI 参数不得低于配置值，上限 8
     const argFetchTop = (args.fetch_top as number) ?? undefined;
     const cfgFetchCount = searxngConfig.fetch_count > 0 ? searxngConfig.fetch_count : undefined;
-    const fetchTop = Math.min(8, Math.max(3, argFetchTop ?? cfgFetchCount ?? 5));
+    const fetchTop = Math.min(8, Math.max(3, argFetchTop ?? 5, cfgFetchCount ?? 0));
 
     // 缓存检查（缓存 key 含 SearXNG 模式，避免切换后返回旧缓存）
     const cacheKey = `${searxngConfig.enabled ? 'searxng' : 'builtin'}:${normalizeUrl(query).toLowerCase()}`;