Add ability to customize smithy mcp home

Author: adwsingh

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

@@ -20,6 +20,7 @@
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Optional;
 import java.util.ServiceLoader;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
@@ -57,7 +58,7 @@ private ConfigUtils() {}
     private static final String OS = System.getProperty("os.name").toLowerCase();
     private static final boolean WINDOWS = OS.contains("windows");
 
-    private static final Path CONFIG_DIR = resolveFromHomeDir(".config", "smithy-mcp");
+    private static final Path CONFIG_DIR = getSmithyMcpCliHome();
     private static final Path BUNDLE_DIR = CONFIG_DIR.resolve("bundles");
     private static final Path SHIMS_DIR = CONFIG_DIR.resolve("mcp-servers");
     private static final Path CONFIG_PATH = CONFIG_DIR.resolve("config.json");
@@ -80,6 +81,12 @@ private ConfigUtils() {}
                 .orElse(new EmptyDefaultConfigProvider());
     }
 
+    private static Path getSmithyMcpCliHome() {
+        return Optional.ofNullable(System.getenv("SMITHY_MCP_CLI_HOME"))
+                .map(Paths::get)
+                .orElseGet(() -> resolveFromHomeDir(".config", "smithy-mcp"));
+    }
+
     public static Path resolveFromHomeDir(String... paths) {
         String userHome = System.getProperty("user.home");
         return Paths.get(userHome, paths);

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

@@ -23,7 +23,7 @@ public abstract class SmithyMcpCommand implements Callable<Integer> {
     InternalLogger LOG = InternalLogger.getLogger(SmithyMcpCommand.class);
 
     @Override
-    public final Integer call() throws Exception {
+    public final Integer call() {
         try {
             var config = loadOrCreateConfig();
             execute(new ExecutionContext(config, RegistryUtils.getRegistry(registryToUse(config), config)));