Description is whatever an index board was created with. Absent on a forge board: this projection takes the repository's name and nothing else about the repository.
ID is the board's opaque handle, and it is NOT how you address it — Key is. Its shape says which source answered: a forge board's is the repository's full name ("hanzoai/cloud"), an index board's a minted "prj_" id.
UpdatedAt is when the board record last changed, in unix seconds — the BOARD, not the work on it, so filing an issue does not move it. 0 on a forge board.