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Fix: preserve LLM metadata (_chat_usage) in StructuredOutputHook #1125

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Fix: preserve LLM metadata (_chat_usage) in StructuredOutputHook #1125

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23 changes: 23 additions & 0 deletions agentscope-core/src/main/java/io/agentscope/core/agent/StructuredOutputHook.java
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Original file line number Diff line number Diff line change
Expand Up @@ -145,6 +145,29 @@ private void handlePostReasoning(PostReasoningEvent event) {

boolean hasCall = !msg.getContentBlocks(ToolUseBlock.class).isEmpty();

// Capture metadata from reasoning message (including _chat_usage)
// This ensures metadata is preserved even when generate_response is called
if (hasCall) {
ChatUsage usage = msg.getChatUsage();
if (usage != null) {
// Aggregate usage from all reasoning rounds
if (this.aggregatedUsage == null) {
this.aggregatedUsage = usage;
} else {
this.aggregatedUsage = ChatUsage.builder()
.inputTokens(this.aggregatedUsage.getInputTokens() + usage.getInputTokens())
.outputTokens(this.aggregatedUsage.getOutputTokens() + usage.getOutputTokens())
.time(this.aggregatedUsage.getTime() + usage.getTime())
.build();
}
}
// Capture ThinkingBlock (keep the last one)
ThinkingBlock thinking = msg.getFirstContentBlock(ThinkingBlock.class);
if (thinking != null) {
this.aggregatedThinking = thinking;
}
}

if (!hasCall && retryCount < MAX_RETRIES) {
retryCount++;
log.debug(
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