Worked on the modelcontextprotocol/kotlin-sdk repository to address reliability issues with HTTP streaming in backend systems using Kotlin and Ktor. Focused on stabilizing server-sent event (SSE) stream reconnections, the work involved explicitly closing stale SSE sessions before establishing new streams, ensuring clients could reliably reconnect to the same session. Replaced asynchronous cleanup with a deterministic try/finally approach using coroutines to prevent race conditions and misleading HTTP status codes. Added identity-based removal logic to avoid evicting new stream mappings during reconnects. The solution was validated through unit and integration tests, as well as manual verification, resulting in improved backend session management.