DRIVERS-3431 : Summary of necessary driver changes Drivers should implement this ticket alongside DRIVERS-3262 . Drivers which already implemented DRIVERS-3262 should double-check their prose test implementations are consistent with the updated wording: Metadata appends during vs. after MongoClient initialization. Avoid requiring "DriverInfoOptions.name = null" . Commits for syncing spec/prose tests (and/or refer to an existing language POC if needed) https://github.com/mongodb/specifications/commit/290ee48973ed0dc8a7c54668e35b19cb012e94ed Context for other referenced/linked tickets Client Metadata Update Prose Tests have been updated to clarify when metadata appends are expected to occur during vs.  after MongoClient initialization. Test Case 1 for Prose Test 7 and 8 is "removed" (strikethrough) in order to avoid requiring "DriverInfoOptions.name = null"  despite the DriverInfoOptions specification stating "name" is not an optional field. An exemption is left for drivers whose API may nevertheless permit a null value as an extension.