feat: migrate to Letta TS SDK v1 (alpha) (#11)

src/agent/message.ts

@@ -2,22 +2,27 @@
  * Utilities for sending messages to an agent
  **/
 
-import type { Letta } from "@letta-ai/letta-client";
+import type { Stream } from "@letta-ai/letta-client/core/streaming";
+import type { MessageCreate } from "@letta-ai/letta-client/resources/agents/agents";
+import type {
+  ApprovalCreate,
+  LettaStreamingResponse,
+} from "@letta-ai/letta-client/resources/agents/messages";
 import { getClient } from "./client";
 
 export async function sendMessageStream(
   agentId: string,
-  messages: Array<Letta.MessageCreate | Letta.ApprovalCreate>,
+  messages: Array<MessageCreate | ApprovalCreate>,
   opts: {
     streamTokens?: boolean;
     background?: boolean;
     // add more later: includePings, request timeouts, etc.
   } = { streamTokens: true, background: true },
-): Promise<AsyncIterable<Letta.LettaStreamingResponse>> {
+): Promise<Stream<LettaStreamingResponse>> {
   const client = await getClient();
-  return client.agents.messages.createStream(agentId, {
+  return client.agents.messages.stream(agentId, {
     messages: messages,
-    streamTokens: opts.streamTokens ?? true,
+    stream_tokens: opts.streamTokens ?? true,
     background: opts.background ?? true,
   });
 }