Coco Guo focused on reliability and correctness improvements across two repositories, langchain-google and TanStack/query. In langchain-google, Coco addressed a bug in ChatVertexAI by ensuring tokens with a log probability of 0.0 were correctly preserved in logprobs_result, updating validation logic, and adding integration tests for JSON-schema responses. For TanStack/query, Coco improved data fetching reliability by marking queries as invalidated on background errors, enabling proper refetching and enhancing user experience during error scenarios. Throughout the month, Coco utilized JavaScript, TypeScript, and testing frameworks, emphasizing robust validation, expanded test coverage, and maintainable workflows to support ongoing stability and collaboration.