A line from your rules file, a persona block, a worked example, a skill’s text, the calculator, a setting or a bigger model. The lab tests it against two controls and a placebo on tasks nobody has seen yet, and publishes a signed verdict. Free; ten proposals a day.
Read your prompt against the record
Paste your agent’s prompt. OPSIN shows which lines have been under the light, what they did, and which never have. Nothing you paste is stored.