"An t-òrd agad."

Translation: Your hammer.

[Cyndi408482]

In this instance, why is there a t- before ord?

[silmeth]

Because òrd is a masculine word starting with a vowel, and masc. nouns starting in a vowel get a t- prefixed after the article an the. It’s described in the tips and notes about the masculine definite article.

[ScottishSteph]

would "òrd agad" not mean "your hammer" as well?

[silmeth]

No, òrd agad doesn’t make any sense on its own, in isolation. But you could use those words in a sentence, eg. tha òrd agad you have a hammer, lit. a hammer is at you.

An t-òrd agad is a self-contained phrase meaning your hammer, similar to English the hammer of yours, the hammer you have.