We call them chicken ladders and yours look a lot nicer than mine. My old one at our place was 2x2 with 2x3 steps. It stayed after used for installation of the steel for chimney cleaning until the middle of winter when the snow on roof unloaded and broke it into 2 ft long pieces.
Next one was a 25 ft ladder with wheel added to the top so they could roll up without scratching steel. A bracket was added at the bottom to catch the bottom rung. Worked great albeit too short until I added a shed roof extension preventing my bracket from being mounted.
Next version has yet to come. I cleaned the chimney while there was a deep pack of snow to walk on last year.