diff --git a/apps/web/src/app/api/tools/search/route.ts b/apps/web/src/app/api/tools/search/route.ts
index f7f68a3..b620549 100644
--- a/apps/web/src/app/api/tools/search/route.ts
+++ b/apps/web/src/app/api/tools/search/route.ts
@@ -93,7 +93,11 @@ export async function GET(request: NextRequest) {
     // Accept both 'q' and 'query' parameters for flexibility
     const query = searchParams.get('q') || searchParams.get('query') || '';
     const category = searchParams.get('category');
-    const limit = Math.min(Number.parseInt(searchParams.get('limit') || '10'), 50);
+    const limit = Math.min(Number.parseInt(searchParams.get('limit') || '10'), 100);
+
+    // Parse excludeIds to filter out tools already in user's collection
+    const excludeIdsParam = searchParams.get('excludeIds');
+    const excludeIds = excludeIdsParam ? excludeIdsParam.split(',').filter(Boolean) : [];
 
     // Get recent messages for context (passed as JSON in 'messages' param)
     // Wrap in try-catch to handle malformed JSON gracefully
@@ -121,6 +125,8 @@ export async function GET(request: NextRequest) {
     // Build database filter - pre-filter at DB level to reduce in-memory processing
     // Use OR conditions to find tools that match ANY search token
     const dbFilter = {
+      // Exclude tools already in collection (if provided)
+      ...(excludeIds.length > 0 && { id: { notIn: excludeIds } }),
       ...(category && { package: { category } }),
       ...(hasSearchQuery && {
         OR: [
diff --git a/apps/web/src/components/collections/AddToolSearch.tsx b/apps/web/src/components/collections/AddToolSearch.tsx
index b1b1244..285db58 100644
--- a/apps/web/src/components/collections/AddToolSearch.tsx
+++ b/apps/web/src/components/collections/AddToolSearch.tsx
@@ -58,9 +58,16 @@ export function AddToolSearch({
     setError(null);
 
     try {
-      const response = await fetch(
-        `/api/tools/search?q=${encodeURIComponent(searchQuery)}&limit=10`
-      );
+      // Build URL with excludeIds to avoid returning tools already in collection
+      const params = new URLSearchParams({
+        q: searchQuery,
+        limit: '50', // Higher limit to handle large packages like @tpmjs/tools-unsandbox (59 tools)
+      });
+      // Pass existing tool IDs so server can exclude them
+      if (existingToolIds.length > 0) {
+        params.set('excludeIds', existingToolIds.join(','));
+      }
+      const response = await fetch(`/api/tools/search?${params.toString()}`);
       const data = await response.json();
 
       if (data.success && data.results?.tools) {
@@ -76,7 +83,7 @@ export function AddToolSearch({
     } finally {
       setIsSearching(false);
     }
-  }, []);
+  }, [existingToolIds]);
 
   // Handle query changes with debounce
   useEffect(() => {