Resolving event mismatch in OpenAI2Claude

add stricter validation for content_block_start corresponding to
tool call
and fix the crash issue when Claude Code is processing tool call

service/convert.go

@@ -389,25 +389,29 @@ func StreamResponseOpenAI2Claude(openAIResponse *dto.ChatCompletionsStreamRespon
 				}
 
 				idx := blockIndex
-				claudeResponses = append(claudeResponses, &dto.ClaudeResponse{
-					Index: &idx,
-					Type:  "content_block_start",
-					ContentBlock: &dto.ClaudeMediaMessage{
-						Id:    toolCall.ID,
-						Type:  "tool_use",
-						Name:  toolCall.Function.Name,
-						Input: map[string]interface{}{},
-					},
-				})
-
-				claudeResponses = append(claudeResponses, &dto.ClaudeResponse{
-					Index: &idx,
-					Type:  "content_block_delta",
-					Delta: &dto.ClaudeMediaMessage{
-						Type:        "input_json_delta",
-						PartialJson: &toolCall.Function.Arguments,
-					},
-				})
+				if toolCall.Function.Name != "" {
+					claudeResponses = append(claudeResponses, &dto.ClaudeResponse{
+						Index: &idx,
+						Type:  "content_block_start",
+						ContentBlock: &dto.ClaudeMediaMessage{
+							Id:    toolCall.ID,
+							Type:  "tool_use",
+							Name:  toolCall.Function.Name,
+							Input: map[string]interface{}{},
+						},
+					})
+				}
+				
+				if len(toolCall.Function.Arguments) > 0 {
+					claudeResponses = append(claudeResponses, &dto.ClaudeResponse{
+						Index: &idx,
+						Type:  "content_block_delta",
+						Delta: &dto.ClaudeMediaMessage{
+							Type:        "input_json_delta",
+							PartialJson: &toolCall.Function.Arguments,
+						},
+					})
+				}
 
 				info.ClaudeConvertInfo.Index = blockIndex
 			}