http://efa.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/toolkits/community-agreements
Many agreements, especially within activist and free and open-source software communities, are under Creative Commons licenses. If you have the resources, there are also for-hire community agreement consultants to guide the writing and approval process. No need to reinvent the wheel, borrowing from pre-existing language can make your agreement more familiar and easy to interpret.