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c6b0e5ac62
The onFinish callback's 'usage' only contains the final step's tokens, which underreports usage for multi-step tool calls (like diagram generation). Changed to 'totalUsage' which provides cumulative counts across all steps. Include all 4 token types for accurate counting: 1. inputTokens - non-cached input tokens 2. outputTokens - generated output tokens 3. cachedInputTokens - tokens read from prompt cache 4. inputTokenDetails.cacheWriteTokens - tokens written to cache Tested locally: - Request 1 (cache write): 334 + 62 + 0 + 6671 = 7,067 tokens - Request 2 (cache read): 334 + 184 + 6551 + 120 = 7,189 tokens - DynamoDB total: 14,256 ✓