fix(bridge): 商品链接兜底与强制检索

bridge/src/agent.js

@@ -10,6 +10,7 @@ const { createMetrics } = require('./metrics');
 const { auditAnswer } = require('./audit');
 const { markdownToHtml } = require('./markdown');
 const { guardReply } = require('./output-guard');
+const { appendMissingProductLinks } = require('./reply-links');
 const { quickClassify, detectEmotion, INTENTS } = require('./intent');
 const { createContextManager } = require('./context');
 const { createReranker } = require('./reranker');
@@ -230,6 +231,26 @@ function createAgent(cfg, deps = {}) {
         stats.completionTokens += Number(response.usage.completion_tokens) || 0;
         stats.totalTokens += Number(response.usage.total_tokens) || 0;
       }
+      // 兜底（旧 bridge 同款）：product_search 意图下首轮 LLM 一个工具都没调时，
+      // 丢弃它凭记忆编的回答，强制查一次真实商品结果再让它重答，避免幻觉商品/链接进入回复。
+      if (!(response.toolCalls && response.toolCalls.length) && step === 0 && intent === INTENTS.PRODUCT_SEARCH && !stats.toolCalls.length) {
+        const searchTool = byName.get('search_products');
+        if (searchTool) {
+          const started = Date.now();
+          try {
+            const forced = await searchTool.handler({ query: currentText, limit: 5 }, ctx);
+            stats.toolCalls.push({ name: 'search_products', ms: Date.now() - started, ok: true, forced: true });
+            stats.toolResults.push(forced);
+            traceSteps.push({ step_type: 'tool', turn: step, tool_name: 'search_products', duration_ms: Date.now() - started });
+            messages.push({ role: 'assistant', content: '', tool_calls: [{ id: 'forced-search-products', type: 'function', function: { name: 'search_products', arguments: JSON.stringify({ query: currentText, limit: 5 }) } }] });
+            messages.push({ role: 'tool', tool_call_id: 'forced-search-products', content: markToolResult('search_products', JSON.stringify(forced).slice(0, 6000)) });
+            console.log(JSON.stringify({ ts: new Date().toISOString(), agent: 'forced_search_products', conversation: conv.uuid, ok: true }));
+            continue;
+          } catch (err) {
+            console.log(JSON.stringify({ ts: new Date().toISOString(), agent: 'forced_search_products', conversation: conv.uuid, ok: false, error: err.message }));
+          }
+        }
+      }
       if (response.toolCalls && response.toolCalls.length) {
         messages.push({ role: 'assistant', content: response.content || '', tool_calls: response.toolCalls });
         for (const call of response.toolCalls) {
@@ -272,6 +293,22 @@ function createAgent(cfg, deps = {}) {
     if (!finalContent) {
       finalContent = '抱歉，我这边暂时无法处理，请您稍后再试。';
     }
+    // 确定性链接兜底（旧 bridge buildProductListText 同款）：LLM 漏写工具返回的真实商品/类目 URL 时，
+    // 由代码在回复末尾补齐，保证客户至少拿到真实可点链接（放在护栏前，补的链接同样过白名单校验）。
+    try {
+      const backfill = appendMissingProductLinks({
+        content: finalContent,
+        toolResults: stats.toolResults,
+        lang: detectLanguage(currentText),
+        html: /<(p|br|a|ul|ol|strong|div)\b/i.test(finalContent),
+      });
+      if (backfill.appended) {
+        finalContent = backfill.content;
+        console.log(JSON.stringify({ ts: new Date().toISOString(), agent: 'link_backfill', conversation: conv.uuid, appended: backfill.appended }));
+      }
+    } catch (err) {
+      console.error(JSON.stringify({ ts: new Date().toISOString(), warn: `link backfill failed: ${err.message}` }));
+    }
     // collect_info 兜底：消息含明显 lead 信息但 LLM 没调 collect_info 时，补抽槽位
     if (buyingIntent && leadStore && !(stats.toolCalls || []).some((t) => t.name === 'collect_info')) {
       try {