Legacy Command Deprecation
At the beginning of April of 2022, Discord will treat the access of message contents to bots as "privileged intent". In this article you can read more about that. Even though an application will be submitted to Discord so that shinpuru will be able to read message content, which is essentially necessary for some of it's features, command parsing has been completely migrated to the new "Slash Command" (actually called Application Command) system.
Because maintaining two different versions of command implementations is twice as time consuming as maintaining a single implementation (wow mafs), the legacy command implementation is now marked as 'deprecated' and will be fully removed in future versions after the 1st of April 2022.
Because registering application commands on a guild requires a new OAuth2 scope, you simply need to re-invite the bot to your guild.
First, you need to kick the bot from your guild. No worries, all guild specific settings are still stored in the database and will persist after re-inviting as usual. Now, go to the web interface of shinpuru and attach /invite to the URL.
Example: https://shnp.de/invite
You can simply type / to a chat channel and then you will get presented a list of usable commands with useful information and help texts. Also, you can go to the Commands section in the web interface where you have a list of all commands and their usage information.
The same list is also available as wiki page.