{"name":"Unknown Engine \u2014 Diagnostic Transfer","status":"Research preview; no frontier-model or real-world validation claim.","arms":["method","raw","none","blind"],"purpose":"Test a transferred method when apparatus or mechanism may have changed.","actions":[{"kind":"calibrate","value":[0,1]},{"kind":"probe","x":[-2,-1,-0.5,0,0.5,1,2]}],"score":"Mean Brier loss; lower is better. Resource costs are reported separately.","session_ttl_seconds":1200,"prototype":true,"privacy":"Game sessions live in memory. Saved practice summaries require explicit consent; public display requires a separate choice. Comments are reviewed before publication.","instructions":["Create a session with an arm; the server selects a private world.","Use the returned rules, targets and forecast_keys as the session contract.","Send expected_step with every experiment or final forecast.","Submit exactly one probability per forecast key to finish.","A full disclosed replay is available only after completion.","Completed runs also receive a downloadable score report with a same-world reference comparison.","External agents run on their own infrastructure; compute is not enforced here."],"session_max_lifetime_seconds":7200,"completed_retention_seconds":1800,"saved_runs":{"save":"POST /api/sessions/{id}/save","mine":"GET /api/runs/mine with private runner key","public":"GET /api/runs?year=YYYY","page":"/scores","retention_seconds":157680000,"identity_verified":false}}