The four-point plan -- reached during talks on the night of October 2-3 with Prime Minister Nuri al-Maliki -- would create committees in Baghdad and elsewhere to monitor efforts against sectarian violence.
Details still need to be worked out, and some Sunni lawmakers are skeptical Shi'ite leaders will allow security forces to crack down more strongly on Shi'ite militias.
U.S. Ambassador to Iraq Zalmay Khalilzad said under the plan, parties with militias have agreed to take responsibility for the militias' actions.
It comes as a fresh wave of sectarian violence left at least 50 dead across Iraq.
Meanwhile, the U.S. military said eight soldiers were killed on October 2.
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SUNNI, SHI'A: Iraq is riven along sectarian lines, faults that frequently produce violent clashes and are a constant source of tension. Sectarian concerns drive much of Iraqi politics and are the main threat to the country's fragile security environment.