What does a test execution tool primarily do?

A test execution tool is primarily designed to run tests and evaluate the actual outcomes against the expected results. This function is crucial for determining if the software behaves as intended. When utilizing such a tool, testers can automate the execution of test cases, record the outputs, and compare those outputs to predefined expectations. This evaluation process helps in identifying discrepancies and bugs in the software under test, thereby facilitating efficient defect detection and ensuring that the application meets its requirements.

The other options represent important aspects of the testing process but do not directly define the main function of a test execution tool. Monitoring the overall test process involves tracking various elements of testing, which is more aligned with test management tools. Creating detailed reports typically falls under the capabilities of reporting tools or test management systems that compile and present data from executed tests. Determining test levels pertains to the initial stages of testing where decisions are made about the scope and depth of testing, rather than the execution itself.