Unclear Which submodule conditions make the check refuse a plugin is not stated.
What
When Claude Code installs a plugin, it first downloads (clones) the plugin's code. It now runs a check on the plugin's submodules after that download. A submodule is a separate code repository included inside another one.
If the check returns an error, the install is reported as a failure with the message "plugin submodule check refused the clone". Before, a finished download counted as a success straight away.
Why
This is a safety step. A plugin whose submodules fail the check no longer installs quietly. If a plugin that used to install now stops with this message, its submodules are the cause.
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Which submodule conditions make the check refuse a plugin is not stated.