From 35b768b71967740d30b9923fe7418f7eab7a4977 Mon Sep 17 00:00:00 2001
From: IanShaw027 <131567472+IanShaw027@users.noreply.github.com>
Date: Wed, 31 Dec 2025 21:35:41 +0800
Subject: [PATCH] =?UTF-8?q?fix(upstream):=20=E8=B7=B3=E8=BF=87=20Claude=20?=
 =?UTF-8?q?=E6=A8=A1=E5=9E=8B=E6=97=A0=20signature=20=E7=9A=84=20thinking?=
 =?UTF-8?q?=20block?=
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- buildParts 函数检测 thinking block 的 signature
- Claude 模型 (allowDummyThought=false) 时跳过无 signature 的 block
- 记录警告日志以便调试
- Gemini 模型继续使用 dummy signature 兼容方案

修复 Issue 0.1: Claude thinking block signature 缺失错误
---
 backend/internal/pkg/antigravity/request_transformer.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/backend/internal/pkg/antigravity/request_transformer.go b/backend/internal/pkg/antigravity/request_transformer.go
index 51eb4299..e5ab8ece 100644
--- a/backend/internal/pkg/antigravity/request_transformer.go
+++ b/backend/internal/pkg/antigravity/request_transformer.go
@@ -3,6 +3,7 @@ package antigravity
 import (
 	"encoding/json"
 	"fmt"
+	"log"
 	"strings"
 
 	"github.com/google/uuid"
@@ -205,6 +206,10 @@ func buildParts(content json.RawMessage, toolIDToName map[string]string, allowDu
 			// 保留原有 signature（Claude 模型需要有效的 signature）
 			if block.Signature != "" {
 				part.ThoughtSignature = block.Signature
+			} else if !allowDummyThought {
+				// Claude 模型需要有效 signature，跳过无 signature 的 thinking block
+				log.Printf("Warning: skipping thinking block without signature for Claude model")
+				continue
 			}
 			parts = append(parts, part)