Use Files.write

Author: adwsingh

io/src/main/java/software/amazon/smithy/java/io/ByteBufferUtils.java

@@ -7,8 +7,6 @@
 
 import java.io.InputStream;
 import java.nio.ByteBuffer;
-import java.nio.charset.Charset;
-import java.nio.charset.StandardCharsets;
 import java.util.Base64;
 
 public final class ByteBufferUtils {
@@ -35,15 +33,6 @@ public static byte[] getBytes(ByteBuffer buffer) {
         return bytes;
     }
 
-    public static String asString(ByteBuffer buffer) {
-        return asString(buffer, StandardCharsets.UTF_8);
-    }
-
-    public static String asString(ByteBuffer buffer, Charset charset) {
-        byte[] bytes = getBytes(buffer);
-        return new String(bytes, charset);
-    }
-
     public static InputStream byteBufferInputStream(ByteBuffer buffer) {
         return new ByteBufferBackedInputStream(buffer);
     }

mcp/mcp-cli-api/src/main/java/software/amazon/smithy/java/mcp/cli/ConfigUtils.java

@@ -99,10 +99,7 @@ static Path getBundleFileLocation(String bundleName) {
      * @throws IOException If there's an error writing to the file
      */
     public static void updateConfig(Config config) throws IOException {
-        var file = CONFIG_PATH.toFile();
-        try (var writer = new FileWriter(file, StandardCharsets.UTF_8)) {
-            writer.write(ByteBufferUtils.asString(JSON_CODEC.serialize(config)));
-        }
+        Files.write(CONFIG_PATH, toJson(config), StandardOpenOption.CREATE_NEW);
     }
 
     /**