test-in-the-consumer-context

Run a check where the thing that depends on it runs — same user, shell, environment, working directory, and privileges — before believing its verdict, and place a check only where it can actually observe its subject. Use before reporting that a command, credential, path, or tool works or fails for something other than your own session, and before siting a check in CI, a hook, or a scheduled job. Not for proving a check can fail at all (verify-the-instrument) and not for checking a claimed capability limit against primary sources (research-the-limit) — this is specifically about the check running somewhere its consumer is not.