Agents are a group of characters in The Matrix franchise. They are sentient computer programs carefully disguised like average-looking human males, displaying a high-level of artificial intelligence.
Agents are representatives within the Matrix fictional universe. They are guardians within the computer-generated world of the Matrix, protecting it from anyone or anything (most often Redpills) that could reveal it as a false reality or threaten it in any other way.
Agents also hunt down and terminate any rogue programs, such as The Keymaker, which no longer serve a purpose to the overall Machine objective. They physically appear human, but have a tendency to speak and act in highly precise and mechanical ways.