The final report of a presidential commission studying American intelligence failures regarding illicit weapons includes a searing critique of how the C.I.A. and other agencies never properly assessed Saddam Hussein’s political maneuverings or the possibility that he no longer had weapon stockpiles, according to officials who have seen the report’s executive summary.

The report also proposes broad changes in the sharing of information among intelligence agencies that go well beyond the legislation passed by Congress late last year that set up a director of national intelligence to coordinate action among all 15 agencies.