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Fix: Claude Code VS Code extension fails to parse responses when every chunk includes usage data #3670

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Fix: Claude Code VS Code extension fails to parse responses when every chunk includes usage data #3670

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6f1c73c
Fix: Claude Code VS Code extension fails to parse responses when ever…
zhaohuiweixiao Apr 1, 2026
1f621a9
Merge branch 'main' into fix_chunkUsage
zhaohuiweixiao Apr 1, 2026
9bc8eab
Merge branch 'main' into fix_chunkUsage
CH3CHO Apr 10, 2026
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24 changes: 6 additions & 18 deletions plugins/wasm-go/extensions/ai-proxy/provider/claude_to_openai.go
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,6 @@ import (
type ClaudeToOpenAIConverter struct {
// State tracking for streaming conversion
messageStartSent bool
messageStopSent bool
messageId string
// Cache stop_reason until we get usage info
pendingStopReason *string
Expand Down Expand Up @@ -392,19 +391,16 @@ func (c *ClaudeToOpenAIConverter) ConvertOpenAIStreamResponseToClaude(ctx wrappe
c.pendingStopReason = nil
}

if c.messageStartSent && !c.messageStopSent {
c.messageStopSent = true
log.Debugf("[OpenAI->Claude] Sending final message_stop event")
messageStopEvent := &claudeTextGenStreamResponse{
Type: "message_stop",
}
stopData, _ := json.Marshal(messageStopEvent)
result.WriteString(fmt.Sprintf("event: %s\ndata: %s\n\n", messageStopEvent.Type, stopData))
// Send message_stop after stream DONE
log.Debugf("[OpenAI->Claude] Sending final message_stop event")
messageStopEvent := &claudeTextGenStreamResponse{
Type: "message_stop",
}
stopData, _ := json.Marshal(messageStopEvent)
result.WriteString(fmt.Sprintf("event: %s\ndata: %s\n\n", messageStopEvent.Type, stopData))

// Reset all state for next request
c.messageStartSent = false
c.messageStopSent = false
c.messageId = ""
c.pendingStopReason = nil
c.nextContentIndex = 0
Expand Down Expand Up @@ -789,14 +785,6 @@ func (c *ClaudeToOpenAIConverter) buildClaudeStreamResponse(ctx wrapper.HttpCont
log.Debugf("[OpenAI->Claude] Generated message_delta event with usage and stop_reason")
responses = append(responses, messageDelta)

// Send message_stop after combined message_delta
if !c.messageStopSent {
c.messageStopSent = true
log.Debugf("[OpenAI->Claude] Generated message_stop event")
responses = append(responses, &claudeTextGenStreamResponse{
Type: "message_stop",
})
}
}

return responses
Expand Down