[CLI] Print help when leaf command with required args is called without args#4135
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…ut args Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
hf download(leaf commands with required positional arguments) used to error out withError: Missing argument 'REPO_ID'when called without args. Command groups likehf jobsprint their help instead. This PR makes leaf commands behave the same way: if a command has at least one required argument and is invoked with no args, print help and exit 0.parse_argsin theHFCliCommandclass factory. Commands with no required arguments (e.g.hf version,hf env) keep running normally.--help/-hstill work.Context: https://huggingface.slack.com/archives/C0ACCEFPU9W/p1776414191737639
Before
After
Verified manually that
hf version,hf env,hf download --help, and groups likehf jobsare unaffected.🤖 Generated with Claude Code
Note
Low Risk
Low risk: small CLI UX change confined to argument parsing for leaf commands, with a targeted test to guard behavior. Main risk is unintended help/exit behavior for commands that rely on empty-args invocation, but it’s gated on having required positional args.
Overview
Leaf CLI commands with required positional arguments now print their help and exit 0 when invoked with no args (e.g.
hf download), matching how command groups behave.Implemented by overriding
TyperCommand.parse_argsviaHFCliCommandin_cli_utils.py, and adds a regression test assertinghf downloadwithout args shows usage/help instead of a missing-argument error.Reviewed by Cursor Bugbot for commit 81ac8ff. Bugbot is set up for automated code reviews on this repo. Configure here.