support array in queries for challenegs

Author: kkartunov

src/mcp/tools/challenges/queryChallenges.parameters.ts

@@ -36,6 +36,12 @@ export const QUERY_CHALLENGES_TOOL_PARAMETERS = z.object({
     .describe(
       'Filter by tag name, case-insensitive, partial matches are allowed.',
     ),
+  tags: z
+    .array(z.string())
+    .optional()
+    .describe(
+      'Filter by multiple tag names, case-insensitive, partial matches are allowed.',
+    ),
   search: z
     .string()
     .optional()

src/shared/topcoder/challenges.service.ts

@@ -21,7 +21,11 @@ export class TopcoderChallengesService {
     const url = new URL(`${TOPCODER_API_BASE_URL}/challenges`);
     Object.entries(queryParams).forEach(([key, value]) => {
       if (value !== undefined && value !== null) {
-        url.searchParams.append(key, value.toString());
+        if (Array.isArray(value)) {
+          value.forEach((v) => url.searchParams.append(key, v));
+        } else {
+          url.searchParams.append(key, value.toString());
+        }
       }
     });