chore: add embedding model to createAgent (#26)

src/index.ts

@@ -159,7 +159,7 @@ export async function prompt(
   // Use default agent behavior (like letta -p) when no agentId specified
   const session = agentId
     ? createSession(agentId)
-    : new Session({ promptMode: true });
+    : createSession();
 
   try {
     await session.send(message);

src/transport.ts

@@ -186,9 +186,6 @@ export class SubprocessTransport {
         // Use agent's default conversation explicitly
         args.push("--default");
       }
-    } else if (this.options.promptMode) {
-      // prompt() without agentId: no agent flags
-      // Headless will use LRU agent or create Memo (like `letta -p "msg"`)
     } else if (this.options.createOnly) {
       // createAgent() - explicitly create new agent
       args.push("--new-agent");
@@ -203,6 +200,11 @@ export class SubprocessTransport {
       args.push("-m", this.options.model);
     }
 
+    // Embedding model
+    if (this.options.embedding) {
+      args.push("--embedding", this.options.embedding);
+    }
+
     // System prompt configuration
     if (this.options.systemPrompt !== undefined) {
       if (typeof this.options.systemPrompt === "string") {

src/types.ts

@@ -139,10 +139,10 @@ export interface InternalSessionOptions {
   newConversation?: boolean;
   defaultConversation?: boolean;
   createOnly?: boolean;
-  promptMode?: boolean;
 
   // Agent configuration
   model?: string;
+  embedding?: string;
   systemPrompt?: SystemPromptConfig;
   
   // Memory blocks (only for new agents)
@@ -192,6 +192,9 @@ export interface CreateAgentOptions {
   /** Model to use (e.g., "claude-sonnet-4-20250514") */
   model?: string;
 
+  /** Embedding model to use (e.g., "text-embedding-ada-002") */
+  embedding?: string;
+
   /**
    * System prompt configuration.
    * - string: Use as the complete system prompt