feat: update search query handling and enhance serpCluster schema

Author: hanxiao

src/agent.ts

@@ -305,7 +305,8 @@ async function executeSearchQueries(
       switch (searchProvider || SEARCH_PROVIDER) {
         case 'jina':
         case 'arxiv':
-          results = (await search(query, searchProvider, 30, meta, context.tokenTracker)).response.results || [];
+          const num = meta ? undefined : 30;
+          results = (await search(query, searchProvider, num, meta, context.tokenTracker)).response.results || [];
           break;
         case 'duck':
           results = (await duckSearch(query.q, { safeSearch: SafeSearchType.STRICT })).results;

src/tools/serp-cluster.ts

@@ -29,6 +29,7 @@ export async function serpCluster(results: SearchSnippet[], trackers: TrackerCon
       system: prompt.system,
       prompt: prompt.user,
     });
+    trackers?.actionTracker.trackThink(result.object.think);
     const clusters = result.object.clusters;
     logInfo(TOOL_NAME, { clusters });
     return clusters;

src/utils/schemas.ts

@@ -176,6 +176,7 @@ export class Schemas {
 
   getSerpClusterSchema(): z.ZodObject<any> {
     return z.object({
+      think: z.string().describe(`Short explain of why you group the search results like this. ${this.getLanguagePrompt()}`).max(500),
       clusters: z.array(
         z.object({
           insight: z.string().describe('Summary and list key numbers, data, soundbites, and insights that worth to be highlighted. End with an actionable advice such as "Visit these URLs if you want to understand [what...]". Do not use "This cluster..."').max(200),