bernstein is an open-source python orchestrator for cli coding agents. it decomposes a goal into tasks, picks a model and a cli agent (claude code, codex, gemini cli, aider, plus 40+ more adapters), isolates each task in a git worktree, runs lint, type-check and tests (plus an optional security scan and cross-model review), and merges only the worktrees that pass. the orchestrator itself is deterministic python, not an llm, so scheduling and routing spend zero model tokens. state lives in .sdd/ on disk; there is no server to provision. apache 2.0, python 3.12+, install with pipx install bernstein. source: https://github.com/sipyourdrink-ltd/bernstein.
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