Seahaven is an open-source Python framework for building synthetic worlds: working copies of your agent tools, realistic enough that the agent cannot tell the difference. It is used for RL and evaluation environments.
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Each instance is its own SQLite database, copied from a fixture in milliseconds and thrown away at the end.
Fixtures freeze states such as small_startup or big_co once and reuse them, so the same fixture, clock and seed give the same run.
seahaven serve hosts hundreds of world instances per process at thousands of requests per second.
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