add initial testing

agent/index.ts

@@ -0,0 +1,33 @@
+import { addMessages, entrypoint } from "@langchain/langgraph";
+import { type BaseMessage } from "@langchain/core/messages";
+import { HumanMessage } from "@langchain/core/messages";
+import { modelNode } from "./nodes/model";
+import { toolNode } from "./nodes/tool";
+import 'dotenv/config';
+
+const agent = entrypoint({ name: "agent" }, async (messages: BaseMessage[]) => {
+  let modelResponse = await modelNode(messages);
+
+  while (true) {
+    if (!modelResponse.tool_calls?.length) {
+      break;
+    }
+
+    // Execute tools
+    const toolResults = await Promise.all(
+      modelResponse.tool_calls.map((toolCall) => toolNode(toolCall))
+    );
+    messages = addMessages(messages, [modelResponse, ...toolResults]);
+    modelResponse = await modelNode(messages);
+  }
+
+  return messages;
+});
+
+export {agent}
+
+const result = await agent.invoke([new HumanMessage("Add 3 and 4.")]);
+
+for (const message of result) {
+  console.log(`[${message.getType()}]: ${message.text}`);
+}