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Bernstein icon

Bernstein

Open-source multi-agent orchestrator for CLI coding agents (Claude Code, Codex, Cursor, Aider, Gemini CLI and 13 more) with a deterministic Python scheduler.

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AI Tools & Services, Development

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  •  1,404 Stars
  •  177 Forks
  •  263 Open Issues
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Bernstein was added to AlternativeTo by alex_chernysh on and this page was last updated .

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What is Bernstein?

Bernstein is an open-source (Apache 2.0) multi-agent orchestrator that runs 18 CLI coding agents in parallel on the same codebase — Claude Code, Codex, Cursor, Aider, Gemini CLI, OpenAI Agents SDK, Amp, Cody, Continue, Goose, Kilo, Kiro, Ollama, OpenCode, Qwen, IaC, Cloudflare Agents, plus a generic wrapper for any CLI tool.

Unlike LLM-driven orchestrators (CrewAI, AutoGen, LangGraph), Bernstein's coordinator is deterministic Python. One LLM call upfront decomposes the goal into a task graph; after that, scheduling, worktree isolation, quality gates, and HMAC-chained audit replay are all code. Every run is bit-identically replayable.

Key features:

  • 18 CLI agent adapters, BYOK (bring your own API keys)
  • Git worktree isolation per agent — parallel edits without collisions
  • Janitor verifies outputs against quality gates (tests pass, files exist, lints clean) before merging to main
  • HMAC-chained audit trail for reproducible, auditable runs
  • MCP (Model Context Protocol) server mode + A2A protocol support
  • Cost-aware model routing with contextual bandit (~50% API spend reduction on internal benchmarks)
  • Optional cloud execution on Cloudflare Workers
  • File-based state in .sdd/ — survives restarts, supports concurrent workers
  • Prometheus metrics, OpenTelemetry exporter, Grafana dashboards

Install: pipx install bernstein (also pip, uv, brew, dnf copr, npx bernstein-orchestrator).