A more thorough explanation:

A summary of argument is a brief statement that outlines the main points of an argument or case. It is usually presented at the beginning of a legal document or court proceeding, and serves as an introduction to the argument that will be presented.

In a court case involving a dispute over a contract, the summary of argument might state:

This case involves a breach of contract claim by the plaintiff against the defendant. The plaintiff alleges that the defendant failed to fulfill their obligations under the contract, resulting in damages to the plaintiff. The defendant disputes these claims and argues that they fulfilled their obligations under the contract.

This summary of argument outlines the main points of the case, including the parties involved, the nature of the dispute, and the positions of each party.

In a legal brief arguing for a change in a law, the summary of argument might state:

This brief argues for a change in the current law regarding gun control. The current law has been shown to be ineffective in preventing gun violence, and a new approach is needed. This brief proposes a new law that would require background checks for all gun purchases, and would ban the sale of certain types of weapons.

This summary of argument outlines the main points of the brief, including the issue being addressed, the problems with the current law, and the proposed solution.

Overall, a summary of argument is a useful tool for presenting a clear and concise overview of an argument or case, and can help to focus the reader's attention on the key issues at hand.