Principle Explain the Number skill: what it does and how to install it

What it does. Examines a measured result by finding its limiting resource or code path from profiles or system counters, then checking alternatives such as errors, cached work, noise or untuned settings. It records the run count, result spread and limiter alongside the number, and points performance checks to a benchmark procedure.

When to use it. Before trusting, reporting or acting on a speedup, regression, throughput, latency or evaluation result. It also applies when the evidence lacks a run count, spread or named limiter.