feat: show cache-creation (write) token total in session usage summary - #492
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feat: show cache-creation (write) token total in session usage summary#492gurjot-05 wants to merge 2 commits into
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The event tab's per-event usage view already renders every usageMetadata field, but the "Usage Summary for Session" totals aggregated only prompt, candidates, and total tokens. Cached-content (cache-read) and thoughts (reasoning) tokens were invisible at the session level, even though they matter for cost tracking. Sum cachedContentTokenCount and thoughtsTokenCount across the session's events and add "Total Cached Content Tokens" and "Total Thoughts Tokens" rows to the session summary. Each row renders only when its total is greater than zero, so sessions without caching or reasoning are unchanged.
gurjot-05
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Extends the session usage summary with a "Total Cache Creation Tokens" row for prompt-cache *write* tokens, complementing the cache-read and reasoning totals. Cache-write is read from the event itself (event.cacheCreationTokenCount) rather than usageMetadata, because google.genai's usage type forbids extra fields; read/reasoning remain usageMetadata fields. The row renders only when the total is greater than zero, so it stays inert until a backend that serializes the field is in use.
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What
Adds a "Total Cache Creation Tokens" row (prompt-cache write) to the Event tab's session usage summary.
Why
Complements the cache-read + reasoning session totals. Cache-write is read from
event.cacheCreationTokenCount(notusageMetadata) becausegoogle.genai's usage type forbids extra fields, so the backend exposes it on the serializable event. The row renders only when> 0, so it stays inert until a backend that serializes the field is deployed.Related PRs
cacheCreationTokenCountinto the event so this row has data to show. Please merge feat: total cached-content and reasoning tokens in session usage summary #491 and the backend PR first (or together).Testing
npm run buildpasses.