Bernstein — Multi-Agent Orchestration

April 29, 2026

Version updated for https://github.com/sipyourdrink-ltd/bernstein to version v1.9.2.

This action is used across all versions by 4 repositories.

Action Type

This is a Composite action.

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Action Summary

Bernstein is a GitHub Action that orchestrates multiple AI coding agents to automate software development tasks. It decomposes a high-level goal into subtasks, assigns them to AI agents, runs tests, and merges successful code, enabling users to achieve working code quickly and efficiently. Its key capabilities include deterministic task orchestration, parallel processing, reproducible runs, and flexibility to integrate with various AI models and providers without vendor lock-in.

What’s Changed

v1.9.2 — per-step CLI override, six new adapters, leaf-node orchestrator delegation

The cooperating-CLI-adapter count goes 31 → 37, plans can mix CLIs between stages, and there’s a separate new “Bernstein orchestrates the orchestrators” delegation track.

Per-step `cli:` in plan files (#965, closes #964)

Plan steps now take a cli: field directly. No more inventing role-shaped wrappers in bernstein.yaml to switch CLIs between stages:

stages:
  - name: red-green-refactor
    steps:
      - { title: Red,      role: backend,  cli: opencode }
      - { title: Green,    role: backend,  cli: opencode }
      - { title: Refactor, role: backend,  cli: opencode }
  - name: review
    steps:
      - { title: Code review, role: reviewer, cli: claude }

Precedence (highest wins): per-step cli: → role_model_policy.<role>.provider → top-level cli: → default adapter. Requested by @smp4 in discussion #962.

Six new cooperating CLI agent adapters (#968)

openhands, open_interpreter, gptme, plandex, aichat, letta_code. Per-adapter install commands, env vars, and CLI invocation flags are documented in docs/adapters/ADAPTER_GUIDE.md. Each adapter mirrors copilot.py (~120 LOC) with three tests apiece.

“Bernstein orchestrates the orchestrators” — leaf-node delegation adapters (#966)

Two adapters that wrap other CLI orchestrators as if each were a single Bernstein agent:

Adapter	Wrapped tool
`composio`	Composio Agent Orchestrator (`@aoagents/ao`)
`ralphex`	umputun/ralphex

Honest framing: leaf-node delegation, not deep meta-orchestration — Bernstein only sees the wrapped tool’s exit code, not its internal sub-agents. Useful when you have an existing workflow built on those tools and want to drop it into one step of a larger Bernstein plan. The README has a new Orchestrator delegation (leaf-node) subsection separating these from the cooperating-CLI count; full write-up on the blog.

Three new comparison pages (#967)

vs. Claude Squad — Go TUI tmux session manager.
vs. claude-flow / Ruflo — Claude Code plugin pack with swarm hooks.
vs. AgentsMesh — self-hosted agent workforce platform.

bernstein-vs-crystal.md also refreshed to describe the actual stravu/crystal product (Electron desktop, deprecated Feb 2026).

Quieter releases (#969)

npm publish failures no longer mark the release deployment as failed. PyPI / GitHub Release / GHCR ship independently while the npm wrapper waits on NPM_TOKEN permissions post-org-transfer.

Bug fixes

catalog: split exact-role threshold from fuzzy threshold (#961). Both were sharing a strict 3-point cutoff that rejected legitimate role matches once an agent had ≥1 cap-word overlap. Exact-role now requires only 1; fuzzy stays at 3.
tests: unbroke two main-CI flakes (#970) — test_quality_endpoint_with_iso8601_timestamps had hardcoded timestamps that aged past the 30-day window; test_heartbeat_idle_threshold_lower_in_evolve_mode needed the same liveness-extension margin its sibling test got in b5da11a6.

Install / upgrade

pipx install --upgrade bernstein
# or
pip install --upgrade bernstein

Full changelog: https://github.com/sipyourdrink-ltd/bernstein/compare/v1.9.1...v1.9.2