I m building mikrokhoros, an open-source Swift runtime for persistent object worlds. An agent observes a concrete world, acts through bounded tools, receives verified consequences, and leaves a replayable trajectory. It s free to use under Apache-2.0 and is currently pre-release.

The current default world provides Athena, an Objective Board, a Library, a Warehouse, and a Marketplace. I m deciding what belongs in the default world and first examples.

If you build agents, simulations, games, or evaluation environments, I d value specific feedback:

What objects or rules make a world useful on day one?