Developed two core features across the block/goose and langgenius/dify repositories, focusing on enhancing AI model capabilities and modernizing API validation. In block/goose, introduced support for Mistral Devstral models with an expanded 262,144-token context window, enabling more advanced long-context reasoning and reducing the risk of context overflow. In langgenius/dify, refactored API request validation by replacing reqparse with Pydantic models, resulting in improved data validation and maintainability. Leveraged Python, Flask, and Pydantic to deliver these solutions, demonstrating strong cross-repository collaboration and attention to code quality through clear commit traceability and targeted, well-documented technical improvements.