From f027829fb2e92d490d10cb29048684c48bcb6e64 Mon Sep 17 00:00:00 2001
From: Stephen Toub <stoub@microsoft.com>
Date: Tue, 23 Sep 2025 12:55:46 -0400
Subject: [PATCH 1/2] Respect ChatOptions.Instructions in
 HuggingFaceClient.GetResponseAsync

---
 .../HuggingFace/Extensions/HuggingFaceApi.ChatClient.cs    | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/libs/HuggingFace/Extensions/HuggingFaceApi.ChatClient.cs b/src/libs/HuggingFace/Extensions/HuggingFaceApi.ChatClient.cs
index 30be420..36626a1 100644
--- a/src/libs/HuggingFace/Extensions/HuggingFaceApi.ChatClient.cs
+++ b/src/libs/HuggingFace/Extensions/HuggingFaceApi.ChatClient.cs
@@ -34,6 +34,13 @@ async Task<ChatResponse> IChatClient.GetResponseAsync(IEnumerable<ChatMessage> m
             }
             prompt.AppendLine();
         }
+
+        if (options?.Instructions is { } instructions)
+        {
+            AppendRole(ChatRole.System);
+            prompt.Append(instructions).AppendLine();
+        }
+
         AppendRole(ChatRole.Assistant);
 
         void AppendRole(ChatRole role) => prompt.Append("<|").Append(role.Value).Append("|>");

From a3cdf9c0f4bb4ee58c2ea64f80afe54ef2c58945 Mon Sep 17 00:00:00 2001
From: Stephen Toub <stoub@microsoft.com>
Date: Thu, 11 Dec 2025 10:53:17 -0500
Subject: [PATCH 2/2] Address feedback

---
 src/libs/HuggingFace/Extensions/HuggingFaceApi.ChatClient.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libs/HuggingFace/Extensions/HuggingFaceApi.ChatClient.cs b/src/libs/HuggingFace/Extensions/HuggingFaceApi.ChatClient.cs
index 36626a1..5fd4f8d 100644
--- a/src/libs/HuggingFace/Extensions/HuggingFaceApi.ChatClient.cs
+++ b/src/libs/HuggingFace/Extensions/HuggingFaceApi.ChatClient.cs
@@ -35,10 +35,10 @@ async Task<ChatResponse> IChatClient.GetResponseAsync(IEnumerable<ChatMessage> m
             prompt.AppendLine();
         }
 
-        if (options?.Instructions is { } instructions)
+        if (!string.IsNullOrWhiteSpace(options?.Instructions))
         {
             AppendRole(ChatRole.System);
-            prompt.Append(instructions).AppendLine();
+            prompt.Append(options?.Instructions).AppendLine();
         }
 
         AppendRole(ChatRole.Assistant);