From 7b877ab83d87ceee3b02a276521fd915af286b39 Mon Sep 17 00:00:00 2001
From: Ziwen Zhao <zzw.mose@gmail.com>
Date: Tue, 11 Nov 2025 17:16:47 -0800
Subject: [PATCH] [Router] use call_id instead of id for matching function
 calls in Responses API for Harmony (#13056)

---
 sgl-router/src/routers/grpc/harmony/builder.rs   | 10 +++++-----
 sgl-router/src/routers/grpc/harmony/responses.rs |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/sgl-router/src/routers/grpc/harmony/builder.rs b/sgl-router/src/routers/grpc/harmony/builder.rs
index 734e3168e..378242222 100644
--- a/sgl-router/src/routers/grpc/harmony/builder.rs
+++ b/sgl-router/src/routers/grpc/harmony/builder.rs
@@ -603,11 +603,11 @@ impl HarmonyBuilder {
                     .iter()
                     .rev()
                     .find_map(|item| match item {
-                        ResponseInputOutputItem::FunctionToolCall { id, name, .. }
-                            if id == call_id =>
-                        {
-                            Some(name.clone())
-                        }
+                        ResponseInputOutputItem::FunctionToolCall {
+                            call_id: item_call_id,
+                            name,
+                            ..
+                        } if item_call_id == call_id => Some(name.clone()),
                         _ => None,
                     })
                     .ok_or_else(|| format!("No function call found for call_id: {}", call_id))?;
diff --git a/sgl-router/src/routers/grpc/harmony/responses.rs b/sgl-router/src/routers/grpc/harmony/responses.rs
index ae0aaf2de..4d87f04ea 100644
--- a/sgl-router/src/routers/grpc/harmony/responses.rs
+++ b/sgl-router/src/routers/grpc/harmony/responses.rs
@@ -1353,7 +1353,7 @@ fn build_next_request_with_tools(
             ..
         }) = items
             .iter_mut()
-            .find(|item| matches!(item, ResponseInputOutputItem::FunctionToolCall { id, .. } if id == &tool_result.call_id))
+            .find(|item| matches!(item, ResponseInputOutputItem::FunctionToolCall { call_id, .. } if call_id == &tool_result.call_id))
         {
             *output = Some(output_str);
             *status = if tool_result.is_error {