From 21e1bc475c3bbef3f70d1a82d70683dfc8b2fe93 Mon Sep 17 00:00:00 2001
From: Bruce-x-1997 <bruce.x@gmicloud.ai>
Date: Tue, 2 Sep 2025 11:37:15 +0800
Subject: [PATCH] [router] fix FunctionCallResponse proto, support arguments is
 null (#9875)

Co-authored-by: forestlee95 <forestlee95@foxmail.com>
---
 sgl-router/src/protocols/spec.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sgl-router/src/protocols/spec.rs b/sgl-router/src/protocols/spec.rs
index 986f991cb..a704bf185 100644
--- a/sgl-router/src/protocols/spec.rs
+++ b/sgl-router/src/protocols/spec.rs
@@ -1565,7 +1565,8 @@ pub enum FunctionCall {
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct FunctionCallResponse {
     pub name: String,
-    pub arguments: String, // JSON string
+    #[serde(default)]
+    pub arguments: Option<String>, // JSON string
 }
 
 // ============= Usage Tracking =============