This time, it was pianissimo. Without the noisy rallies or vituperative broadsides that marked its last round of labor negotiations, the Metropolitan Opera and two of its biggest unions reached a tentative labor agreement Friday morning, paving the way for its season to open next month.

If the deal is ratified, it will remove the threat of a work stoppage as the company prepares for its first season with the conductor Yannick Nézet-Séguin as its music director. This is a sensitive moment for the Met, which is trying to recover from the firing of James Levine, its longtime former music director, over allegations of sexual misconduct. The Met and Mr. Levine, who has denied the allegations, have sued one another.

But in a break with past practice, neither the Met nor the two unions — Local 802 of the American Federation of Musicians, which represents the orchestra, and the American Guild of Musical Artists, which represents the chorus, singers and stage managers, among others — released the terms of the deal. So it was unclear how it would impact the bottom line of a company that is struggling financially and at the box office.