Worked on the MetaMask/utils repository to enhance CAIP-19 asset ID parsing and validation, focusing on improving interoperability and correctness for wallets and dApps. Developed new TypeScript data structures and parsing functions to support a broader range of asset IDs, including optional token IDs, aligning closely with the CAIP-19 proposal. Emphasized robust validation using regular expressions and comprehensive testing to reduce asset misidentification risks and strengthen downstream integration. The work improved repository readiness for ecosystem-wide adoption and compliance, demonstrating a methodical approach to API development and standards alignment. Delivered one feature in the period, with a focus on maintainability and correctness.