Nomad changes

docs/snippets/php/mcp/mcp_custom_client.md

@@ -0,0 +1,39 @@
+```php title="PHP"
+<?php
+
+declare(strict_types=1);
+
+$descriptors = [
+    0 => ['pipe', 'r'],
+    1 => ['pipe', 'w'],
+    2 => ['pipe', 'w'],
+];
+
+$process = proc_open(['kreuzberg', 'mcp'], $descriptors, $pipes);
+if (!is_resource($process)) {
+    throw new RuntimeException('failed to spawn kreuzberg mcp');
+}
+
+$request = [
+    'method' => 'tools/call',
+    'params' => [
+        'name' => 'extract_file',
+        'arguments' => [
+            'path' => 'document.pdf',
+            'async' => true,
+        ],
+    ],
+];
+
+fwrite($pipes[0], json_encode($request, JSON_THROW_ON_ERROR) . "\n");
+fclose($pipes[0]);
+
+$response = fgets($pipes[1]);
+if ($response !== false) {
+    echo $response;
+}
+
+fclose($pipes[1]);
+fclose($pipes[2]);
+proc_close($process);
+```