diff --git a/src/Relay.php b/src/Relay.php
index cca3b53..a8fc269 100644
--- a/src/Relay.php
+++ b/src/Relay.php
@@ -6,6 +6,7 @@
 
 use Illuminate\Support\Facades\Cache;
 use Prism\Prism\Contracts\Schema;
+use Prism\Prism\Schema\AnyOfSchema;
 use Prism\Prism\Schema\ArraySchema;
 use Prism\Prism\Schema\BooleanSchema;
 use Prism\Prism\Schema\EnumSchema;
@@ -326,7 +327,7 @@ protected function getSchemeParameters(array $properties, string $definitionName
         $parameters = [];
         foreach ($properties as $name => $property) {
 
-            $parameter = $this->getSchemeParameter($name, $property, $definitionName);
+            $parameter = $this->getSchemeParameter((string) $name, $property, $definitionName);
             if ($parameter instanceof Schema) {
                 $parameters[] = $parameter;
             }
@@ -340,7 +341,7 @@ protected function getSchemeParameters(array $properties, string $definitionName
      *
      * @throws RelayException
      */
-    protected function getSchemeParameter(string $name, array $property, string $definitionName): Schema|null
+    protected function getSchemeParameter(string $name, array $property, string $definitionName): ?Schema
     {
         if ($property === []) {
             return null;
@@ -348,6 +349,14 @@ protected function getSchemeParameter(string $name, array $property, string $def
 
         $type = data_get($property, 'type');
         $description = $this->getParameterDescription($name, $property, $definitionName);
+
+        if ($type === null && isset($property['anyOf'])) {
+            $type = 'anyOf';
+            $itemsSchema = $this->getSchemeParameters(data_get($property, 'anyOf', []), $definitionName);
+
+            return new AnyOfSchema($itemsSchema, $name, $description);
+        }
+
         $itemsSchema = $this->getSchemeParameter('', data_get($property, 'items', []), $definitionName);
 
         return match ($type) {
diff --git a/tests/TestDoubles/RelayFake.php b/tests/TestDoubles/RelayFake.php
index 58a747d..201f3b7 100644
--- a/tests/TestDoubles/RelayFake.php
+++ b/tests/TestDoubles/RelayFake.php
@@ -182,6 +182,28 @@ protected function fetchToolDefinitions(): array
                     'required' => ['script'],
                 ],
             ],
+            [
+                'name' => 'union_tool',
+                'description' => 'A tool with union parameter',
+                'inputSchema' => [
+                    'type' => 'object',
+                    'properties' => [
+                        'nameOrId' => [
+                            'anyOf' => [
+                                [
+                                    'type' => 'string',
+                                    'description' => 'Name',
+                                ],
+                                [
+                                    'type' => 'number',
+                                    'description' => 'ID',
+                                ],
+                            ],
+                        ],
+                    ],
+                    'required' => ['nameOrId'],
+                ],
+            ],
         ];
     }
 
diff --git a/tests/Unit/RelayTest.php b/tests/Unit/RelayTest.php
index e2c4347..f9d70c5 100644
--- a/tests/Unit/RelayTest.php
+++ b/tests/Unit/RelayTest.php
@@ -5,6 +5,7 @@
 namespace Tests\Unit;
 
 use Illuminate\Support\Facades\Cache;
+use Prism\Prism\Schema\AnyOfSchema;
 use Prism\Prism\Tool;
 use Prism\Relay\Exceptions\ServerConfigurationException;
 use Prism\Relay\Exceptions\ToolDefinitionException;
@@ -86,7 +87,7 @@
     $tools = $relay->tools();
 
     // Test we have the tools we expect
-    expect($tools)->toHaveCount(6);
+    expect($tools)->toHaveCount(7);
 });
 
 it('handles different parameter types correctly in tools', function (): void {
@@ -128,3 +129,29 @@
     expect($tools)->toBeArray()
         ->and($tools !== [])->toBeTrue();
 });
+
+it('supports mapping any of schemas', function (): void {
+    $relay = new RelayFake($this->serverName);
+
+    // Call tools() to create handlers
+    $tools = $relay->tools();
+
+    $tool = $tools[6];
+    $anyOf = $tool->parameters()['nameOrId'];
+
+    expect($anyOf)
+        ->toBeInstanceOf(AnyOfSchema::class)
+        ->and($anyOf->toArray())->toBe([
+            'anyOf' => [
+                [
+                    'description' => 'Name',
+                    'type' => 'string',
+                ],
+                [
+                    'description' => 'ID',
+                    'type' => 'number',
+                ],
+            ],
+            'description' => 'Parameter nameOrId for union_tool',
+        ]);
+});