Worked on enhancing outbound delivery reliability in the moltbot/moltbot repository, focusing on robust handling of mid-batch failures to prevent duplicate message deliveries. Leveraged TypeScript for backend development, implementing queue state transitions and clarifying fallback logic to ensure accurate state management during error scenarios. Developed and expanded integration tests using the real SQLite delivery queue, validating that failures with send evidence correctly advance to unknown_after_send and prevent blind replays. The work included test suite maintenance, such as removing unused imports and clarifying guard conditions, resulting in reduced outbound duplicates, improved stability during reconnects, and stronger end-to-end guarantees for message delivery.