diff --git a/src/main/apiServer/routes/knowledge/handlers.ts b/src/main/apiServer/routes/knowledge/handlers.ts
index 6af64725e0..990fa5625f 100644
--- a/src/main/apiServer/routes/knowledge/handlers.ts
+++ b/src/main/apiServer/routes/knowledge/handlers.ts
@@ -142,8 +142,12 @@ async function getProviderConfig(providerId: string): Promise<{ apiKey: string;
   baseURL = baseURL.replace(/\/+$/, '')
   baseURL = baseURL.replace(/#$/, '')
 
+  // If multiple API keys are configured (comma-separated), use the first one.
+  // Matches the main-process convention in OpenClawService.
+  const apiKey = provider.apiKey ? provider.apiKey.split(',')[0].trim() : ''
+
   return {
-    apiKey: provider.apiKey || '',
+    apiKey,
     baseURL
   }
 }
diff --git a/src/main/apiServer/services/chat-completion.ts b/src/main/apiServer/services/chat-completion.ts
index 644bd2778f..9ad08b3f00 100644
--- a/src/main/apiServer/services/chat-completion.ts
+++ b/src/main/apiServer/services/chat-completion.ts
@@ -67,9 +67,13 @@ export class ChatCompletionService {
 
     const modelId = modelValidation.modelId!
 
+    // If multiple API keys are configured (comma-separated), use the first one.
+    // Matches the main-process convention in OpenClawService.
+    const apiKey = provider.apiKey ? provider.apiKey.split(',')[0].trim() : ''
+
     const client = new OpenAI({
       baseURL: provider.apiHost,
-      apiKey: provider.apiKey
+      apiKey
     })
 
     return {