Something I saw made me investigate these two words.

Problem:
These two words are not quite synonyms but are sometimes used as synonyms.

Explanation:
“Intent” is both a noun and an adjective. “Intention” is only a noun.

“Intent” as an adjective means earnest, steadfast, focused, or concentrated.

“Intent” as a noun is sometimes used as a synonym for “intention”; however, the former is stronger than the latter.

“Intent” as a noun means deliberateness. “Intention” means anticipated outcome.

Solution:
Use “intention” when talking about actions that one proposes to take. Use “intent” when talking about aim or purpose or when you need the adjective.