WASHINGTON — In January 2003, 10 months into the Central Intelligence Agency’s secret prison program, the agency’s chief of interrogations sent an email to colleagues saying that the relentlessly brutal treatment of prisoners was a train wreck “waiting to happen and I intend to get the hell off the train before it happens.” He said he had told his bosses he had “serious reservations” about the program and no longer wanted to be associated with it “in any way.”

The bitter infighting in the C.I.A. interrogation program was only one symptom of the dysfunction, disorganization, incompetence, greed and deception described in a summary of the Senate Intelligence Committee’s report. In more than 500 pages, the summary, released on Tuesday, paints a devastating picture of an agency that was ill equipped to take on the task of questioning Al Qaeda suspects, bungled the job and then misrepresented the results.

On Tuesday morning, the C.I.A. acknowledged problems in the early months of the program but suggested that they had been fixed. “The study as a whole leads the reader to believe that the management shortcomings that marked the initial months persisted throughout the program, which is historically inaccurate,” the agency said.