diff --git a/mcp/src/main/java/io/modelcontextprotocol/spec/McpSchema.java b/mcp/src/main/java/io/modelcontextprotocol/spec/McpSchema.java
index 3f8150271..0cddc289a 100644
--- a/mcp/src/main/java/io/modelcontextprotocol/spec/McpSchema.java
+++ b/mcp/src/main/java/io/modelcontextprotocol/spec/McpSchema.java
@@ -1216,6 +1216,7 @@ public ListToolsResult(List<Tool> tools, String nextCursor) {
 	@JsonIgnoreProperties(ignoreUnknown = true)
 	public record JsonSchema( // @formatter:off
 		@JsonProperty("type") String type,
+		@JsonProperty("items") JsonSchema items,
 		@JsonProperty("properties") Map<String, Object> properties,
 		@JsonProperty("required") List<String> required,
 		@JsonProperty("additionalProperties") Boolean additionalProperties,