The country has praised an agreement between a five-nation commission and Iran as historic.
The Ministerio de Relaciones Exteriores y Culto said that that agreement will represent a first solid step toward an enduring solution.
Under the deal reached in Geneva early Sunday, Iran must limit its enrichment of uranium and freeze reactor construction.
Representatives from Germany, China, The United States, The United Kingdom and Russia negotiated the deal with Iran.
Costa Rica noted that it is a member of the International Atomic Energy Organization and that it will support the monitoring and verification of the Iranian nuclear program.
The deal drew strong criticism from Israel and silence from its main Gulf rival, Saudi Arabia.
Israel and Saudi Arabia have long feared Iran will divert nuclear activities to make atomic weapons that could threaten their interests. Iran says its nuclear program is peaceful.
In return for Iran’s concessions, the United States and five other world powers agreed to ease some international sanctions on Iran’s economy.
Israeli Prime Minister Benjamin Netanyahu told the Israeli Cabinet the Geneva agreement is an historic mistake that makes the world a much more dangerous place.
Israel wants more sanctions on Iran and a complete dismantling of its nuclear facilities.
Israeli leaders see a nuclear-armed Iran as a threat to their nation’s existence due to Iran’s frequent calls for Israel’s demise. Netanyahu said Israel will “not allow Iran to have a nuclear weapons capability.”
President Barack Obama offered reassurance late Saturday, saying Washington’s commitment to Israel and to its Gulf partners will “remain firm.” He also said those nations have “good reason to be skeptical about Iran’s intentions.”
In an interview with CNN, Secretary of State John Kerry said the deal with Iran will make Israel “safer” because it is designed to expand the amount of time Iran would need to make a nuclear weapon.