[bugfix] add claude usage & bedrock tool_call index (#3095)

plugins/wasm-go/extensions/ai-proxy/provider/bedrock.go

@@ -107,8 +107,9 @@ func (b *bedrockProvider) convertEventFromBedrockToOpenAI(ctx wrapper.HttpContex
 		chatChoice.Delta.Content = nil
 		chatChoice.Delta.ToolCalls = []toolCall{
 			{
-				Id:   bedrockEvent.Start.ToolUse.ToolUseID,
-				Type: "function",
+				Id:    bedrockEvent.Start.ToolUse.ToolUseID,
+				Index: 0,
+				Type:  "function",
 				Function: functionCall{
 					Name:      bedrockEvent.Start.ToolUse.Name,
 					Arguments: "",
@@ -137,7 +138,8 @@ func (b *bedrockProvider) convertEventFromBedrockToOpenAI(ctx wrapper.HttpContex
 		if bedrockEvent.Delta.ToolUse != nil {
 			chatChoice.Delta.ToolCalls = []toolCall{
 				{
-					Type: "function",
+					Index: 0,
+					Type:  "function",
 					Function: functionCall{
 						Arguments: bedrockEvent.Delta.ToolUse.Input,
 					},

plugins/wasm-go/extensions/ai-proxy/provider/claude_to_openai.go

@@ -440,12 +440,17 @@ func (c *ClaudeToOpenAIConverter) ConvertOpenAIStreamResponseToClaude(ctx wrappe
 
 // buildClaudeStreamResponse builds Claude streaming responses from OpenAI streaming response
 func (c *ClaudeToOpenAIConverter) buildClaudeStreamResponse(ctx wrapper.HttpContext, openaiResponse *chatCompletionResponse) []*claudeTextGenStreamResponse {
+	var choice chatCompletionChoice
 	if len(openaiResponse.Choices) == 0 {
-		log.Debugf("[OpenAI->Claude] No choices in OpenAI response, skipping")
-		return nil
+		choice = chatCompletionChoice{
+			Index: 0,
+			Delta: &chatMessage{
+				Content: "",
+			},
+		}
+	} else {
+		choice = openaiResponse.Choices[0]
 	}
-
-	choice := openaiResponse.Choices[0]
 	var responses []*claudeTextGenStreamResponse
 
 	// Log what we're processing