* Immediate action: the OpenAI API key should be sourced securely via environment variables, not hardcoded. * Idiomatic Rust usage is evident, leveraging `?` for concise error propagation in the `tokio` async implementation. * The application effectively demonstrates conversation state management via serializing and restoring the chat history JSON. * Current structure is purely a single `main.rs` demonstration; separation of concerns is required for production scaling.
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