@neilmayhew
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The --help option says:

Usage:
  appstream-generator <subcommand> [OPTION...] - AppStream Generator.

AppStream Metadata Generator

Subcommands:
  process [SUITE]      - Process new metadata for the given distribution suite.
  cleanup              - Cleanup old metadata and media files.
  remove-found [SUITE] - Drop all valid processed metadata and hints.

Help Options:
  -h, --help       Show help options

Application Options:
  --version        Show the program version
  --verbose        Show extra debugging information
  -w|--workspace   Define the workspace location

So [SUITE] is shown as being optional for process and remove-found. However, if SUITE is omitted, process and remove-found say:

Invalid number of parameters: You need to specify a suite name.