The ArgumentHelpText attribute can now be applied to the record type itself
to display help text at the top of the --help output, before field descriptions.
This enables better documentation of command-line argument parsers.
Features:
- Type-level help text appears before argument list
- Multiline help text is supported
- Backward compatible with existing code
- Help text appears in both --help and error messages
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Co-authored-by: Claude <noreply@anthropic.com>
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