No mutual agreement is needed. Either player can decide to claim a draw by threefold repetition (§9.2) or 50 moves (§9.3). The only difference with the fivefo

No mutual agreement is needed. Either player can decide to claim a draw by threefold repetition (§9.2) or 50 moves (§9.3). The only difference with the fivefold repetition and 75 move rules (§9.6) is that those draws are automatic. https://handbook.fide.com/chapter/E012018 https://handbook.fide.com/chapter/E012018