diff --git a/src/renderer/src/aiCore/prepareParams/parameterBuilder.ts b/src/renderer/src/aiCore/prepareParams/parameterBuilder.ts
index 0a89e73c62..1ad04230b5 100644
--- a/src/renderer/src/aiCore/prepareParams/parameterBuilder.ts
+++ b/src/renderer/src/aiCore/prepareParams/parameterBuilder.ts
@@ -134,9 +134,10 @@ export async function buildStreamTextParams(
     if (aiSdkProviderId === 'google-vertex') {
       tools.google_search = vertex.tools.googleSearch({}) as ProviderDefinedTool
     } else if (aiSdkProviderId === 'google-vertex-anthropic') {
+      const blockedDomains = mapRegexToPatterns(webSearchConfig.excludeDomains)
       tools.web_search = vertexAnthropic.tools.webSearch_20250305({
         maxUses: webSearchConfig.maxResults,
-        blockedDomains: mapRegexToPatterns(webSearchConfig.excludeDomains)
+        blockedDomains: blockedDomains.length > 0 ? blockedDomains : undefined
       }) as ProviderDefinedTool
     }
   }
diff --git a/src/renderer/src/aiCore/utils/websearch.ts b/src/renderer/src/aiCore/utils/websearch.ts
index 2fda7c1b19..9e29454b79 100644
--- a/src/renderer/src/aiCore/utils/websearch.ts
+++ b/src/renderer/src/aiCore/utils/websearch.ts
@@ -61,9 +61,10 @@ export function buildProviderBuiltinWebSearchConfig(
       }
     }
     case 'anthropic': {
+      const blockedDomains = mapRegexToPatterns(webSearchConfig.excludeDomains)
       const anthropicSearchOptions: AnthropicSearchConfig = {
         maxUses: webSearchConfig.maxResults,
-        blockedDomains: mapRegexToPatterns(webSearchConfig.excludeDomains)
+        blockedDomains: blockedDomains.length > 0 ? blockedDomains : undefined
       }
       return {
         anthropic: anthropicSearchOptions