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PluviobyteandCursor
1e6d0b602a
The antigravity upstream-passthrough path (account.Type == AccountTypeUpstream forwarding to a Claude-format upstream) drains the SSE stream via streamUpstreamResponse + extractSSEUsage. The extractor only reads top-level event["usage"], which matches Anthropic's message_delta but misses message_start where usage is nested under event.message.usage. As a result, every streaming /v1/messages request through this path drops the input-side fields (input_tokens, cache_read_input_tokens, cache_creation_*) and writes a usage_logs row with input_tokens=0 + output_tokens>0. The user in #2332 observed 2,728 such rows attributed to claude-opus-4-6 / haiku-4-5 streaming requests; their billing on output is correct but the input-side accounting is missing. (Their "duplicate write from message_delta" hypothesis isn't borne out by the code — RecordUsage is invoked once per request and writeUsageLogBestEffort dedupes by request_id; what they're seeing is single records produced by this buggy extractor.) Branch on event.type so message_start reads from event.message.usage and other events keep using event.usage, matching how parseSSEUsagePassthrough already handles both shapes for the Anthropic OAuth / API-key / Bedrock paths. Adds two extractSSEUsage table cases plus a TestExtractSSEUsage_StreamingSequence that drives the message_start → message_delta sequence end-to-end; both fail on main and pass with this change. Fixes #2332 Co-authored-by: Cursor <cursoragent@cursor.com>