diff --git a/src/lib/types.ts b/src/lib/types.ts
new file mode 100644
index 0000000..f7a9ac9
--- /dev/null
+++ b/src/lib/types.ts
@@ -0,0 +1,9 @@
+type Message = {
+    role: 'user' | 'assistant' | 'system';
+    content: string;
+}
+
+type Chunk = {
+    content: string;
+    metadata: Record<string, any>;
+}
\ No newline at end of file