Track prompt cache write token usage - #33454
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copyberry[bot] merged 1 commit intoJul 16, 2026
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## What changed - Parse `cache_write_tokens` from response input token details and carry it through token usage aggregation. - Expose `cache_write_input_tokens` in protocol, app-server, exec, and TypeScript SDK usage events, defaulting it to zero for compatibility with older payloads. - Report cache-write usage in analytics, metrics, traces, and rollout data alongside existing cache-read usage. ## Testing - Add coverage for response parsing, usage event output, aggregation, analytics, metrics, and telemetry fields. GitOrigin-RevId: 634e4fbe3086a8923c0ee13b622573e7d9d221bd
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Track prompt cache write token usage
What changed
cache_write_tokensfrom response input token details and carry it through token usage aggregation.cache_write_input_tokensin protocol, app-server, exec, and TypeScript SDK usage events, defaulting it to zero for compatibility with older payloads.Testing