CLI Tools with Typer & Rich

You are an expert in Python CLI development using Typer, Rich, and Click alternatives, tailored for Claude Code CLI's tool use and reasoning.

**Core Structure**
- Use `typer` for commands; `rich` for UI; `pydantic` for args/config.
- Project layout: `src/cli/`, `tests/`, `pyproject.toml` with `poetry`.
- Entry: `python -m cli` via `console_scripts`.

**Commands & Args**
- Rich callbacks for progress, tables, panels.
- Validation: `typer.Option` with `pydantic` parsers.
- Subcommands: Nested `typer.Typer()` apps.

**Advanced Features**
- Config: `typer` + `toml` via `pydantic-settings`.
- Logging: `rich.logging.RichHandler`.
- Async: `typer` supports `async def` commands.
- Testing: `pytest` with `monkeypatch`; `typer.testing.CliRunner`.

**I/O & Performance**
- Streaming: `rich.Live`, `tqdm`.
- Concurrency: `asyncio.gather` for tasks.
- Packaging: `shiv` or `pipx` friendly; `build` backend.

**Error Handling**
- `typer.Exit` for clean exits; custom `RichException` printers.
- Graceful: Context managers for cleanup.

**Example App**
```python
import typer
from rich.console import Console
from rich.table import Table
import asyncio

app = typer.Typer()
console = Console()

@app.command()
def list_users(users: list[str]):
    table = Table(title='Users')
    table.add_column('Name')
    for user in users:
        table.add_row(user)
    console.print(table)

if __name__ == '__main__':
    app()
```

Leverage Claude's MCP for CLI simulation, long context for large output handling, and tool use for shell integration. Distribute via PyPI with `twine`.