Ping

Check a key before pointing an agent at it: 200 with its scopes, the processing_region where a model reads its memories (null when that region has no model to write with) and region, a label the operator set with REGION (eu when not set), which the service cannot check: not a statement of where the data is. Or 401. No scope is needed. It counts against the request ceiling like every other call: past it, 429 with Retry-After.