For refineCollectionShardKey:

1. Should be a command on mongos in a file named cluster_refine_collection_shard_key.cpp in src/mongo/s/commands to match our convention
2. Forwards its arguments to the config server primary by sending _configsvrRefineCollectionShardKey using the config shard from the shard registry with an idempotent retry policy
3. Invalidates the routing table entry for the given namespace through the catalog cache

For _configsvrRefineCollectionShardKey:

1. Should be a command on the config server in a file named configsvr_refine_collection_shard_key.cpp in src/mongo/db/s/config to match our convention
2. Returns success always

Both should inherit from TypedCommand, not BasicCommand.