CAIRO — The African Union envoy to Sudan and protest leaders said on Saturday that the pro-democracy movement and the governing military council had finalized a power-sharing agreement announced last month.

The envoy, Mohamed el-Hassan Lebatt, said they agreed on a constitutional declaration outlining the division of responsibilities for a three-year transition to elections. He did not provide further details or say when the agreement would be signed.

But Sudan’s state-run SUNA news agency quoted the protest leader Omar al-Dagir as saying the agreement would be signed on Sunday. Protest leaders also confirmed the development.

The document, which outlines the powers and the relationships between the branches of the transitional government, comes after weeks of protracted negotiations brokered by the African Union and neighboring Ethiopia amid sporadic bouts of violence in the capital, Khartoum, and other cities.