Nat Chung developed the attachment traceability feature for the anomalyco/opencode MCP tool, focusing on enhancing data integrity and auditability. By integrating unique identifiers such as id, sessionID, and messageID into each attachment, Nat improved end-to-end traceability and streamlined session-scoped data handling. The implementation, written in TypeScript, addressed missing identifiers and ensured that all attachments could be reliably tracked within the session context. This work strengthened the reliability and troubleshooting efficiency of the MCP tool, demonstrating careful attention to code quality, version control, and robust session management practices while delivering measurable improvements to user experience and business value.