agree vs Mandatory

Some examples from the web:

• Various professional bodies should agree on common property valuation standards.
• Holders may also agree on switching right-of-occupancy apartments.
• But they agree that the list of people who knew Hodges was alive short.
• But most scientists agree on the final chapter.
• We likewise agree on air inside buildings.
• All educated people agree on that.
• And for once the witnesses agree.
• Most doctors agree it's untreatable.
• I think my girl Danica would agree.
• Look, we both agree Victor was sloppy.
• A sentiment with which you clearly agree.
• Carrie's fiancé doesn't agree.
• You know we never agree on anything.
• Reckon Mabel would agree, Mr Farnon.
• Apparently, your staff doesn't agree.
• Pretty sure the judge will agree.
• We've chosen to agree that monogamy is unrealistic.
• And even the people of Rome agree...
• And for each remaining drawing to agree.
• I completely agree about the power of unexpressed passion.

Some examples from the web:

• The Mandatory Marriage Act got passed today.
• Mandatory for services with an explicit geographic extent.
• Mandatory CO2 targets for cars and vans
• Mandatory appointment of a statutory auditor.
• Mandatory membership of animal health service.
• Mandatory education in Argentina is divided in three phases.
• Mandatory statutory provisions, in particular retention periods, remain unaffected.
• Mandatory if the rating was withdrawn during the reporting period.
• Mandatory field "Contributor" is empty.
• Mandatory contributions will finance core activities and administrative costs.
• Mandatory Messenger upgrades are nothing new.
• Mandatory activities in laboratory require active participation, relational skills, full individual involvement.
• Mandatory three-day sentences for all repeat graffiti thugs.
• Mandatory psych evaluations for the entire agency.
• But then, basically, it becomes Mandatory to have a car.
• Next law: Mandatory bow ties on all dogs.
• Mandatory vaccination of animals is less effective in rural areas.
• One of the models implemented is Mandatory Access Control model.
• Mandatory departure cleaning fee: 100 €
• Section II Mandatory public offers to buy Article 105 General provisions 1.