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The REPL mode offers powerful auto-completion for packages, services, and messages, making manual API exploration intuitive without memorizing commands, as demonstrated in the GIFs.

CLI mode follows UNIX philosophy, allowing input from stdin and files with JSON output for easy integration with tools like jq, enabling seamless automation, as shown in examples.

Supports gRPC reflection, enabling connection to servers without manually specifying proto files, simplifying setup and usage with the -r option.

Fully supports client, server, and bidirectional streaming RPCs with intuitive input handling, detailed in the usage sections for both modes.

Allows easy management of custom headers and displays enriched responses including headers, trailers, and status codes with the --enrich option, useful for debugging.