fixes and renames

src/tools/get_balance.ts

@@ -1,14 +1,14 @@
 import { LAMPORTS_PER_SOL, PublicKey } from "@solana/web3.js";
-import { SolanaAgentKit } from "../index";
+import { SolanaAgent } from "../index";
 
 /**
  * Get the balance of SOL or an SPL token for the agent's wallet
- * @param agent - SolanaAgentKit instance
+ * @param agent - SolanaAgent instance
  * @param token_address - Optional SPL token mint address. If not provided, returns SOL balance
  * @returns Promise resolving to the balance as a number (in UI units) or null if account doesn't exist
  */
 export async function get_balance(
-  agent: SolanaAgentKit,
+  agent: SolanaAgent,
   token_address?: PublicKey,
 ): Promise<number | null> {
   if (!token_address)