The future National Security Council of the incoming Carter administration met for more than two hours here yesterday in the absence of the U.S. foreign policy agenda for 1977 and beyond.

The meeting in the third floor NSC conference room in the Executive Office Building was presided over by Vice President-elect Walter F. Mondale. The session, marked on the calendars of some incomeing high officials simply as "National Security Coucil," was authorized in advance by Carter and announced by his press spokesman in Plains, Ga.

Informed sources said there was discussion of priorities and schedules for the new administration across a broad range of the problems it will inherit form the Frod administration on Jan. 20.

These include U.S. relations with the Soviet Union regarding strategic armanents and other matters, a Western-Japanese summit conference on the world's economy proposed for April by French President Valery Giscard d'Estaing, the Arab-Israeli dispute and related Middle East matters, U.S. negotiations with Panama on a new canal treaty and with Greece, Turkey and the Philippines on U.S. military bases, and the current negotiations in Southern Africa aimed at a transition from white minority rule.

Mondale sat at the head of a T-shaped table to reside over the meeting, aided by incoming White House national security adviser Zbigniew Brzezinski, who brought the agenda.

On many of the topics, Secretary of State-designate Cyrus R. Vance spoke up first as the person who will have principal responsibility for diplomatic planning and execution, it was reported.

Others who participated in the meeting were Secretary of Defense-designate Harold Brown and his deputy, Charles W. Duncan Jr.; Central Intelligence Agency Director-designate [TEXT OMITTED FROM SOURCE] dor to the United Nations-designate nate Charles L. Schultz; Deputy Secretary of State-designate Warren will be deputy national security adviser.

The high officials-to-be were armed with thick, black-bound briefing books snow moved in just a little faster than produced by transition staff aides and the government bureaucracy.

With no formal responsibility for policy and no international crises on the horizon, the "mock NSC meeting" - as one official called it - was described as largely a get-acquainted session. "Session's Happiness" gas the message chalked on the blackboard.

In a related development, Lucy Wilson Benson, who was selected Tuesday to become under secretary of state for security assistance, said a planned reorientation of State Department functions will give her office jurisdiction over such problems as agriculture and population problems.

Created to deal primarily with foreign military assistance, the job may eventually be renamed under secretary for transnational policy or under secretary for global affairs, Benson said.