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Tooling

Develop, test, and serve missions outside Cosmos with the sbs command line tool and the cosmos_dev dev package (a browser mock GUI, headless testing, and a web-page server). None of this ships inside a mission — it's for building and debugging.

The mock is for testing only — not an engine replacement

The mock GUI and headless runner approximate the engine so you can test missions offline. They are not a reimplementation of Cosmos, and 100% parity is not a goal — some behaviors are approximated or absent by design. Please don't open issues or feature requests for more engine parity; if something must behave exactly like the engine, verify it in Cosmos.