The US-Russia agreement came after lengthy talks in Moscow between US Secretary of State John Kerry, Russian President Vladimir Putin and his Foreign Minister Sergei Lavrov.
"This is the first hopeful news concerning that unhappy country in a very long time," Brahimi said of Syria in a statement.
"The statements made in Moscow constitute a very significant first step forward. It is nevertheless only a first step," said the veteran Algerian diplomat who an aide has been mulling resignation over the apparent absence of a political track to resolve the brutal civil war.
"It is equally important that the entire region mobilises in the support of the process," it added.
The latest moves came as the United Nations said efforts were under way to secure the release of four Filipino peacekeepers seized by gunmen on the Golan Heights.
Kerry and Lavrov announced the agreement at a Moscow news conference.
"We agreed that Russia and the United States will encourage both the Syria government and opposition groups to find a political solution," Lavrov said.
Lavrov and Kerry said they hoped they could convene an international conference by the end of May to build on the Geneva accord agreed by world powers last June for a peaceful solution in Syria.
The Geneva agreement, which was never implemented, set out a path toward a transitional government without ever spelling out the fate of President Bashar al-Assad.
The six-point accord -- negotiated by the last UN-Arab League envoy to Syria Kofi Annan -- "should be the road map... by which the people of Syria can find their way to the new Syria and in which the bloodshed, the killing, the massacres can end", Kerry said.
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