Faiz Mohammad is best known for his books on Afghan history. During Habib Ullah's reign, he accepted two commissions to write a comprehensive history of Afghanistan covering events from the time of Ahmad Shah down through the reign of Habib Ullah Khan. The first was a history of Afghanistan entitled "Tohfat ul-Habib" (Ḥabib's gift) in honor of the amir, but Habib Ullah Khan deemed the finished work unacceptable and ordered Faiz Mohammad to start over. The revised version is the three-volume history of Afghanistan entitled Siraj al-Tawarikh (Lamp of Histories), an allusion to the amir's honorific “Lamp of the Nation and Religion” (Siraj al-mella waʾl-din). There were also problems in publishing it, the third volume never being completely printed. It is thought that the process of publishing the third volume lasted several years and only ended after Habib Ullah Khan's death. Some say the publication on the third volume was halted at page 1,240 for unspecified reasons. Habib Ullah Khan's successor, Aman Ullah Khan, was initially interested in the work and typesetting resumed in the mid-1920s, but when the amir reviewed the material in it on Anglo-Afghan relations, he reportedly changed his mind, and ordered all published but still incomplete copies of the third volume taken from the press and burned. Despite this reaction, Faiz Mohammad continued work on his chronicle. The manuscript of the remainder of the third volume is widely believed to have been finished, and the autograph was reportedly turned over to the Afghan archives by Faiz Mohammad's son. Volumes devoted to Habib Ullah Khan and Aman Ullah Khan may also have been written. A "farman" issued by the latter announced that Faiz Mohammad had been ordered to complete the "Siraj" and then begin work on a chronicle of the reign of Aman Ullah Khan to be entitled "Tarikh-e Asr-e Amaniya". There is some evidence to suggest he did indeed carry out these commissions, although nothing more was ever published.