To also jump in here, regarding tools the agents had access to function signatures (i.e tool docstrings, input and output types) and for each tool a small "manual", which described what the tool does, how it affects the game state and a small number of examples where using this tool would be useful (for instance, how to use place_entity_next_to to put an inserter next to an existing chest)

Overall as Jack said, no post-training was done at all but all agents had a complete API description (tools, entities, research) in their context so the results indicate to some level how well can modern agents use a completely OOD API with decent level of documentation