pref: change the database type to SQLite

app/lib/.server/llm/chat-stream-text.ts

@@ -80,7 +80,7 @@ ${Object.entries(context)
 
   return _streamText({
     model,
-    tools,
+    tools: tools(),
     system: systemPrompt,
     maxOutputTokens: maxTokens || MAX_TOKENS,
     messages: convertToModelMessages(messages),

app/lib/.server/llm/tools/index.ts

@@ -1,9 +1,17 @@
+import type { Tool, ToolSet } from 'ai';
 import { serperTool } from './serper';
 import { weatherTool } from './weather';
 
-export const tools = {
-  serper: serperTool,
-  weather: weatherTool,
-};
+export const tools: () => ToolSet = () => {
+  const tools: Record<string, Tool> = {};
 
-export { serperTool, weatherTool };
+  if (process.env.SERPER_API_KEY) {
+    tools.serper = serperTool;
+  }
+
+  if (process.env.WEATHER_API_KEY) {
+    tools.weather = weatherTool;
+  }
+
+  return tools;
+};