fix: Add cache token support to ChatAnthropicVertex streaming responses #1010
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lkuligin
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Jun 30, 2025
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@imranarshad could you fix the linting, please? |
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- Add reusable _create_usage_metadata() function matching langchain_anthropic - Fix streaming message_start events to extract cache tokens - Fix streaming message_delta events to follow official pattern - Unify non-streaming to use same logic for consistency - Use proper LangChain UsageMetadata structure with input_token_details - Remove custom CacheUsageMetadata class in favor of standard types Fixes missing cache token information in streaming responses to match official langchain_anthropic behavior and enable proper cost tracking.
- Fix import sorting and remove unused type: ignore comments - Remove invalid stream_runnable parameter from AgentExecutor - Update test assertions to expect correct LangChain UsageMetadata format - All tests now pass with proper cache token handling
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Fixes missing cache token information in streaming responses to match official langchain_anthropic behavior and enable proper cost tracking.
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