In the famous Hadith:
الكيس من دان نفسه وعمل لما بعد الموت والعاجز من أتبع نفسه هواها وتمنى على الله
is the addition الأماني at the end which is found in Jami’us Saghir also part of the Hadith?
This Hadith appears in the following primary sources without the extra part that you are querying:
Sunan Tirmidhi, Hadith: 2577
Sunan Ibn Majah, Hadith: 4260
Musnad Ahmad, vol. 4 pg. 124
Mustadrak Hakim, vol. 1 pg. 57 and vol. 4 pg. 251
Al-Mu’jamul Kabir, Hadith: 7143
Al-Mu’jamus Saghir, vol. 2 pg. 36
Shu’abul Iman, Hadith: 10062
Kitabul Adab of Imam Bayhaqi, Hadith: 991
Kitabuz Zuhd of Imam Ibnul Mubarak, Hadith: 171
Musnad Bazzar, Hadith: 3489
Musnadush Shihab, Hadith: 185
However, latter day Hadith Scholars like ‘Allamah Zabibdi and ‘Allamah Munawi (rahimahumallah) have explicitly stated that this extra does appear in some versions of this Hadith.
(Sharhul Ihya, vol.8 pg.428 and Faydul Qadir, Hadith: 6468)
Furthermore, like you have pointed, ‘Allamah Suyuti (rahimahullah) has cited it in Jami’us Saghir too, while referencing it to the first four sources mentioned above.
It is possible that it was found in some other sources (I later saw it in Musnadul Firdaws, Hadith: 4966) or even in different copies of the above mentioned sources.
And Allah Ta’ala Knows best,
Answered by: Moulana Muhammad Abasoomar