Typer Model Args

An extension for Typer that enables model arguments.

Typer Model Args lets you declare Pydantic model parameters in your Typer command and automatically exposes its fields as proper Typer options/arguments on the command line. It keeps Typer’s annotations, adds missing ones when possible, and can convert typing.Literal fields into Enums for better CLI help and validation.

• Works with Typer
• Works with Pydantic models
• Preserves Typer metadata/annotations
• Optional Literal-to-Enum conversion for cleaner help and choices

Installation

uv add typer_model_args

Quickstart

# app.py
import typer
from typing import Annotated
from pydantic import BaseModel
from typer_model_args import flatten_parameter_model_to_signature

class CliArgs(BaseModel):
    name: Annotated[str, typer.Option(...)]
    description: str | None = None

app = typer.Typer()

@app.command()
@flatten_parameter_model_to_signature()
def create(arguments: CliArgs, another_arg: str):
    """
    After decoration, --name/--description become top-level CLI options.
    """
    typer.echo(f"name={arguments.name}, desc={arguments.description}, extra={another_arg}")

if __name__ == "__main__":
    app()

API

• flatten_parameter_model_to_signature(*, literals_to_enums: bool = True)
  • Flattens all pydantic model parameters in the decorated function into the function signature used by Typer.
  • literals_to_enums: when True, fields annotated with typing.Literal are turned into Enums so Typer can display and validate choices.

Why use this?

• Keep your CLI schema and validation centralized in Pydantic models.
• Get clean, well-typed Typer commands without manually duplicating model fields as options.
• Better help messages and validation with minimal boilerplate.

Requirements

• Python 3.10+
• Typer
• Pydantic

License

MIT