Short answers, pulled from the story.
The earliest Chinese translation of the Madhyama Agama appeared between 397 and 398 C.E. This specific timeframe marks the survival of a text that likely originated in India centuries earlier.
Scholars organize the Madhyama Agama into exactly 222 discourses across eighteen chapters. These discourses reside within volume 26 of the Taisho Tripiata.
The Pali equivalent known as the Majjhima Nikaya contains only 152 discourses divided into fifteen chapters. This difference in count highlights how different traditions preserved the same core teachings differently.
Translation efforts for the Madhyama Agama began in earnest during 2006 with Marcus Bingenheimer serving as chief editor. Bhikkhu Analayo and Rodney S. Bucknell joined the project as co-editors to assist with the massive undertaking.
The surviving manuscript belongs to the Sarvastivada tradition of early Buddhism. Only this single Chinese translation remains extant today within the Taisho Tripiata.