Worked on the envoyproxy/ai-gateway repository to address a parsing issue in the OpenAI Responses API, specifically targeting multi-turn input handling where assistant messages lacked explicit type fields. Using Go, the developer improved JSON handling to prevent unmarshalling failures and ensure reliable communication across diverse client implementations, including external integrations like OpenCode. The solution incorporated robust testing strategies, including AI-assisted test drafting, to validate typeless message scenarios and guard against regressions. This work enhanced the resilience and interoperability of multi-turn conversations, strengthened downstream service reliability, and contributed to clearer documentation and code review processes within the API development workflow.