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Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Anthropic Usage objects permit null cache counters. Adding those fields to input_tokens raises TypeError and interrupts message-history updates. Treat missing or null cache counters as zero and retain populated cache counts when computing total usage.
Validation:
PYTHONPATH=agents python -m pytest tests/agents/test_optional_cache_usage.py -q(6 passed in 0.01s). The regression tests fail on the unchanged main branch. Tests use local fixtures; no paid API calls.Prepared with Codex assistance; the final diff and regression behavior were checked locally.