Use input items for Responses Lite tools

codex-rs/protocol/src/models.rs

@@ -917,6 +917,12 @@ pub struct ResponseItemMetadata {
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, JsonSchema, TS)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum ResponseItem {
+    #[schemars(skip)]
+    #[ts(skip)]
+    AdditionalTools {
+        role: String,
+        tools: Vec<serde_json::Value>,
+    },
     Message {
         #[serde(default, skip_serializing_if = "Option::is_none")]
         #[ts(optional)]