The standoff ended in 1990, when Mr Habre was toppled by the Libyan-backed Idriss Deby.
Up until last year, Chad's President Idriss Deby provided Mr Bozize with his personal guards, she said.
Chadian President Idriss Deby announced his forces would not be sticking around for a protracted guerrilla war with the radical Islamic insurgents.
King Idriss was at least a unifying figure for a country that had not long been unified and had been independent only since 1951.
On Monday, the Security Council did pass a resolution condemning the rebel advance and calling for governments to extend support to President Idriss Deby.
Chad President Idriss Deby, who attended the signing ceremony, said the deal would allow Mr Bozize to complete his mandate, which expires in 2016.
The announcement follows Friday's declaration by Chadian President Idriss Deby that his troops had also killed Abdelhamid Abou Zeid, another top rebel leader in Mali.
Chad, which has been ruled by Idriss Deby since 1990, has been ranked by Transparency International as one of the most corrupt countries in the world.
"It seems impossible to us to recognise a man who has appointed himself, " said Chadian President Idriss Deby following the emergency summit hosted in Chad's capital, N'Djamena.
Confusion continues to surround the fate of both Abou Zeid and Mokhtar Belmokhtar, but Chad's President Idriss Deby appeared on television on Monday evening to insist that both men were dead.
BBC: Islamist commander Abou Zeid's death in Mali 'probable'
After this session, the first round table will take place, moderated by Moussa Idriss Ndele, President of the Pan African Parliament, and Mezri Haddad, Ambassador and Permanent Delegate of Tunisia to UNESCO.
UNESCO: Detailview | United Nations Educational, Scientific and Cultural Organization
Salim Idriss, a general with the rebel Free Syrian Army, said Wednesday that his forces were outgunned by Hezbollah fighters and appealed to the international community for heavy weapons to help his fighters in Qusayr.
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