I will unite
Bondsmith oaths are focused on unity, unification, and bringing others together. However, this is a loose theme, as there are so few Bondsmiths—and the three sources of their powers are so different in personality—that the oaths can end up taking a variety of different shapes, depending on the situation.
Anyone can become a Bondsmith, subject to persuading one of the three spren who grant Bondsmith powers. Those powers tend to work differently for one Bondsmith than another, and even those Surges they share with other Orders tend to work differently for Bondsmiths.
The Bondsmiths are unusual in that there are never more than three full members. Historically, they worked to resolve disputes and help set up functioning governments. Even though there can only be three full members, there were times that some Bondsmiths did take squires. Beyond that, many of the retinues that protected the Bondsmiths were considered members of the Order–going so far as to swear oaths, even though they didn’t have a spren and never would. Some even called this the most pure form of being a Radiant, because these were oaths sworn not in the name of gaining powers, but simply for the good of the oaths themselves.
Bondsmiths are generally the heart and soul of the Radiants, the most protected and highly regarded of the Orders, capable of doing incredible things with the nature of oaths, bonds, and power. The Order, including the aforementioned squires and attendants, tends to attract the peacemakers of the world, those who want to bring people together rather than divide them.