When only using command decorator for closures, parameter parsing is strange

[typed-sigterm]

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Example Code

# https://codesandbox.io/p/devbox/s3kyh5?file=%2Fmain.py%3A6%2C26

Description

(described in the reproduction)

Operating System

Windows

Operating System Details

No response

Typer Version

0.15.3

Python Version

3.13.3

Additional Context

No response

[brianm78]

That seems expected behaviour, and isn't anything to do with being in a closure. Rather, its because when you've only one command, typer doesn't create a group - it just invokes the single command. So main.py foo isn't selecting the foo command, it's directly invoking the only defined command with argument "foo". When you add a second command (your lambda), it then creates a group, and so then "foo" is selecting the command.