The phrase "agreeing on a protocol" is correct and usable in written English.
It can be used when discussing the process of reaching a mutual understanding or consensus on a set of rules or procedures.
Example: "After several meetings, we finally reached a point of agreeing on a protocol for the project."
Alternatives: "reaching a consensus on a protocol" or "establishing a protocol agreement".
Governments and treatment sites from the five participating countries agreed on a sound study protocol, and the INCANT trial is now underway as planned.
Still, it has been only within the last few weeks that the two departments agreed on a protocol governing such investigations.
The Nationals' guidelines for increasing innings after surgery appear logical, but the careers of Strasburg and Giolito might need to play out before the industry agrees on a protocol for how many innings a pitcher should work as he recovers from the procedure.
Before the start of the clinical phase, the 3 treating therapists agreed on a protocol of therapeutic exercises (type; dosage; progression).
Although all teams met in June 2011 and agreed on a protocol, the time it took to receive institutional review board approval as well as contact all necessary key informants within the following 3 months proved overly optimistic.
Indeed, the international community agreed on a 'Detection Protocol' in 1990 that sets out the steps that a research group should take in the event of a contact.
Penny points out that the international community has yet to agree on a Reply Protocol because there are widely differing views on whether such a course of action would be beneficial or dangerous for humanity.
New York City's Police and Fire Departments agreed on a new protocol for responding to a variety of life-or-death emergencies, putting to rest a long-running dispute.
America under both Bill Clinton and George Bush has shunned a new international criminal court, the treaty for which has been ratified by 70 other countries, and the Bush administration has pulled out of efforts to agree on a verification protocol for the Biological Weapons Convention.
