From 3eee8c7a21e012cde776e768fd71511fd8ed0a87 Mon Sep 17 00:00:00 2001
From: Seefs <i@seefs.me>
Date: Tue, 16 Dec 2025 13:08:58 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E6=94=AF=E6=8C=81=E4=BC=A0=E5=85=A5syst?=
 =?UTF-8?q?em=5Finstruction=E5=92=8CsystemInstruction=E4=B8=A4=E7=A7=8D?=
 =?UTF-8?q?=E9=A3=8E=E6=A0=BC=E7=B3=BB=E7=BB=9F=E6=8F=90=E7=A4=BA=E8=AF=8D?=
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---
 dto/gemini.go | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/dto/gemini.go b/dto/gemini.go
index 1ee71a71..4d738c22 100644
--- a/dto/gemini.go
+++ b/dto/gemini.go
@@ -22,6 +22,27 @@ type GeminiChatRequest struct {
 	CachedContent      string                     `json:"cachedContent,omitempty"`
 }
 
+// UnmarshalJSON allows GeminiChatRequest to accept both snake_case and camelCase fields.
+func (r *GeminiChatRequest) UnmarshalJSON(data []byte) error {
+	type Alias GeminiChatRequest
+	var aux struct {
+		Alias
+		SystemInstructionSnake *GeminiChatContent `json:"system_instruction,omitempty"`
+	}
+
+	if err := common.Unmarshal(data, &aux); err != nil {
+		return err
+	}
+
+	*r = GeminiChatRequest(aux.Alias)
+
+	if aux.SystemInstructionSnake != nil {
+		r.SystemInstructions = aux.SystemInstructionSnake
+	}
+
+	return nil
+}
+
 type ToolConfig struct {
 	FunctionCallingConfig *FunctionCallingConfig `json:"functionCallingConfig,omitempty"`
 	RetrievalConfig       *RetrievalConfig       `json:"retrievalConfig,omitempty"`