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fix(streaming): initialize usage when message_start omits it - #1
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dajiaohuang wants to merge 1 commit into
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When message_start event omits the usage field, the usage is never initialized. This causes errors later when message_delta tries to access current_snapshot.usage.output_tokens. This fix ensures usage is initialized with default values (input_tokens=0, output_tokens=0) when message_start omits it.
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The usage initialization problem already has an active upstream submission at anthropics#1815. That proposal includes stable/beta and sync/async regressions and preserves unknown token counts; this older fork patch has no added regression tests. Retained as a historical reference; no duplicate upstream submission is planned.