diff --git a/src/app/Console/Commands/MakeManualSiteNamesJson.php b/src/app/Console/Commands/MakeManualSiteNamesJson.php
index f209389..9ff4716 100644
--- a/src/app/Console/Commands/MakeManualSiteNamesJson.php
+++ b/src/app/Console/Commands/MakeManualSiteNamesJson.php
@@ -2,11 +2,14 @@
 
 namespace App\Console\Commands;
 
+use App\Console\Concerns\ResolvesLocalDiskPaths;
 use Illuminate\Console\Command;
 use Illuminate\Support\Facades\Storage;
 
 class MakeManualSiteNamesJson extends Command
 {
+    use ResolvesLocalDiskPaths;
+
     protected $signature = 'world-heritage:make-manual-names-json
         {--in=storage/app/private/unesco/manual_input.txt : Input text file}
         {--out=storage/app/private/unesco/site_names_manual.json : Output JSON file}
@@ -22,7 +25,7 @@ public function handle(): int
         $pretty = (bool) $this->option('pretty');
         $strict = (bool) $this->option('strict');
 
-        $inPath = $this->resolvePath($in);
+        $inPath = $this->resolvePathToFile($in);
         if (!is_file($inPath)) {
             $this->error("Input not found: {$inPath}");
             return self::FAILURE;
@@ -87,14 +90,14 @@ public function handle(): int
             return self::FAILURE;
         }
 
-        $outDiskPath = $this->toLocalDiskPath($out);
+        $outDiskPath = $this->normalizeLocalDiskPath($out);
         if ($outDiskPath === '') {
             $this->error("Output path is empty.");
             return self::FAILURE;
         }
 
         Storage::disk('local')->put($outDiskPath, $json);
-        $this->info("Wrote: storage/app/{$outDiskPath} (count=" . count($rows) . ")");
+        $this->info('Wrote: ' . Storage::disk('local')->path($outDiskPath) . ' (count=' . count($rows) . ')');
 
         return self::SUCCESS;
     }
@@ -215,33 +218,4 @@ private function isSiteLine(string $line): bool
         return preg_match('/[\(（]\s*\d{4}.*[\)）]\s*$/u', $line) === 1;
     }
 
-    private function resolvePath(string $path): string
-    {
-        $path = trim($path);
-        if ($path === '') {
-            return $path;
-        }
-        if (str_starts_with($path, '/')) {
-            return $path;
-        }
-        if (preg_match('/^[A-Za-z]:\\\\/', $path) === 1) {
-            return $path;
-        }
-
-        return base_path($path);
-    }
-
-    private function toLocalDiskPath(string $path): string
-    {
-        $trimPath = trim($path);
-        if ($trimPath === '') {
-            return $trimPath;
-        }
-
-        if (str_starts_with($trimPath, 'storage/app/')) {
-            return substr($trimPath, strlen('storage/app/'));
-        }
-
-        return ltrim($trimPath, '/');
-    }
 }
diff --git a/src/app/Packages/Domains/WorldHeritage/Tests/MakeManualSiteNamesJsonTest.php b/src/app/Packages/Domains/WorldHeritage/Tests/MakeManualSiteNamesJsonTest.php
new file mode 100644
index 0000000..13d1df9
--- /dev/null
+++ b/src/app/Packages/Domains/WorldHeritage/Tests/MakeManualSiteNamesJsonTest.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Packages\Domains\WorldHeritage\Tests;
+
+use Illuminate\Support\Facades\Artisan;
+use Illuminate\Support\Facades\Storage;
+use Tests\TestCase;
+
+class MakeManualSiteNamesJsonTest extends TestCase
+{
+    private function writeInputFixture(): void
+    {
+        // Always written at the disk-relative key, regardless of which --in
+        // string form (disk-relative or storage/app/private/...) a test uses,
+        // since both forms must normalize to this same key.
+        Storage::disk('local')->put('unesco/manual_input_test.txt', "Japan\nテストサイト (2000)\n");
+    }
+
+    public function test_accepts_disk_relative_input_path_like_other_commands(): void
+    {
+        Storage::fake('local');
+        $this->writeInputFixture();
+
+        $exitCode = Artisan::call('world-heritage:make-manual-names-json', [
+            '--in' => 'unesco/manual_input_test.txt',
+            '--out' => 'storage/app/private/unesco/manual_output_test.json',
+        ]);
+
+        $this->assertSame(0, $exitCode);
+    }
+
+    public function test_output_is_written_without_a_doubled_private_segment(): void
+    {
+        Storage::fake('local');
+        $this->writeInputFixture();
+
+        Artisan::call('world-heritage:make-manual-names-json', [
+            '--in' => 'storage/app/private/unesco/manual_input_test.txt',
+            '--out' => 'storage/app/private/unesco/manual_output_test.json',
+        ]);
+
+        $this->assertTrue(Storage::disk('local')->exists('unesco/manual_output_test.json'));
+        $this->assertFalse(Storage::disk('local')->exists('private/unesco/manual_output_test.json'));
+    }
+}