Question

when is the 25th amendment meant to be invoked?
when congress agrees that the president has overstepped the bounds of their office
when the president is incapacitated, or otherwise unfit to perform their duties
when the president wishes to take a vacation

Explanation:

The 25th Amendment to the U.S. Constitution addresses presidential succession and disability. Its core purpose is to provide a framework for transferring power when the president cannot fulfill their duties due to incapacitation (e.g., illness, injury) or unfitness, ensuring continuity of government. The other options do not align with its intent: overstepping office bounds relates to impeachment, and vacation does not require invoking the amendment.

Answer:

when the president is incapacitated, or otherwise unfit to perform their duties