diff --git a/springdoc-openapi-starter-common-mcp/src/main/java/org/springdoc/ai/mcp/OpenApiSchemaConverter.java b/springdoc-openapi-starter-common-mcp/src/main/java/org/springdoc/ai/mcp/OpenApiSchemaConverter.java
index 844f9f8fb..800f70daf 100644
--- a/springdoc-openapi-starter-common-mcp/src/main/java/org/springdoc/ai/mcp/OpenApiSchemaConverter.java
+++ b/springdoc-openapi-starter-common-mcp/src/main/java/org/springdoc/ai/mcp/OpenApiSchemaConverter.java
@@ -293,7 +293,12 @@ private static void applySchemaContent(Schema<?> schema, ObjectNode node, Compon
 
 		// Type and nullable
 		String type = getSchemaType(schema);
-		if (Boolean.TRUE.equals(schema.getNullable())) {
+		Set<String> types = schema.getTypes();
+		if (types != null && types.size() > 1) {
+			ArrayNode typeArray = node.putArray("type");
+			types.forEach(typeArray::add);
+		}
+		else if (Boolean.TRUE.equals(schema.getNullable())) {
 			ArrayNode typeArray = node.putArray("type");
 			typeArray.add(type != null ? type : "object");
 			typeArray.add("null");
diff --git a/springdoc-openapi-starter-common-mcp/src/test/java/org/springdoc/ai/mcp/OpenApiSchemaConverterTest.java b/springdoc-openapi-starter-common-mcp/src/test/java/org/springdoc/ai/mcp/OpenApiSchemaConverterTest.java
index c91d2502d..01f968a4a 100644
--- a/springdoc-openapi-starter-common-mcp/src/test/java/org/springdoc/ai/mcp/OpenApiSchemaConverterTest.java
+++ b/springdoc-openapi-starter-common-mcp/src/test/java/org/springdoc/ai/mcp/OpenApiSchemaConverterTest.java
@@ -23,6 +23,7 @@
 
 import tools.jackson.databind.JsonNode;
 import tools.jackson.databind.ObjectMapper;
+import io.swagger.v3.core.util.Json31;
 import io.swagger.v3.oas.models.Components;
 import io.swagger.v3.oas.models.Operation;
 import io.swagger.v3.oas.models.media.Content;
@@ -751,6 +752,41 @@ void testNullableHandling() throws Exception {
 		assertThat(nicknameNode.get("type").get(1).asText()).isEqualTo("null");
 	}
 
+	/**
+	 * Test that OpenAPI 3.1 request body properties retain every declared type.
+	 * @throws Exception if JSON parsing fails
+	 */
+	@Test
+	void testOpenApi31TypeArraysInRequestBody() throws Exception {
+		Operation operation = Json31.mapper().readValue("""
+				{
+				  "requestBody": {
+				    "content": {
+				      "application/json": {
+				        "schema": {
+				          "type": "object",
+				          "properties": {
+				            "content": { "type": ["string", "null"] },
+				            "label": { "type": ["integer", "string"] }
+				          }
+				        }
+				      }
+				    }
+				  }
+				}
+				""", Operation.class);
+
+		String schemaJson = OpenApiSchemaConverter.buildInputSchema("/notes", operation, null);
+		JsonNode properties = objectMapper.readTree(schemaJson).at("/properties/body/properties");
+
+		assertThat(properties.at("/content/type").isArray()).isTrue();
+		assertThat(properties.at("/content/type")).extracting(JsonNode::asText)
+			.containsExactlyInAnyOrder("string", "null");
+		assertThat(properties.at("/label/type").isArray()).isTrue();
+		assertThat(properties.at("/label/type")).extracting(JsonNode::asText)
+			.containsExactlyInAnyOrder("integer", "string");
+	}
+
 	/**
 	 * Test that anyOf schemas produce a JSON Schema anyOf array in input schema.
 	 * @throws Exception if JSON parsing fails