Developed the Encrypted Reasoning Integrity and Safe Replay in Responses API feature for the UKGovernmentBEIS/inspect_ai repository, focusing on enhancing data integrity and auditability in AI-assisted workflows. Leveraged Python for backend development and testing, implementing logic to populate the 'internal' field during Codex transcript parsing to ensure encrypted content persists across user interactions. Updated the Responses API to robustly handle empty content, reducing edge-case failures when transcripts are incomplete and enabling reliable replay of encrypted reasoning. This work improved the reliability and trustworthiness of the API, addressing challenges in preserving sensitive data across complex AI-driven processes.