OpenRig

Open source multi-agent harness for coding teams.

A harness wraps a model. A rig wraps your harnesses. Define your agent team in YAML, boot it with one command. Claude Code and Codex in the same rig, managed as one system.

Quick Start

# Install
npm install -g @openrig/cli

# Prepare the machine (attempts tmux, cmux, Claude Code, Codex, tmux defaults — reports what worked)
rig setup

# Boot the conveyor starter rig (4 seats, mixed runtimes)
rig up conveyor

# Open the UI
rig ui open

After the conveyor rig boots, open the UI and click intake.lead in the topology graph. Use Open CMUX to jump into a terminal for that node. If cmux is not available, use the tmux attach command shown in the node detail panel instead.

Launch Walkthrough

The launch path above has been walked end-to-end on fresh macOS VMs. The only thing your agent can't do would be the oauth logins for claude and openai and dealing with permission prompts.

1. Open the conveyor rig

When the UI opens, the explorer is already visible on the left. Click the conveyor rig to load its live topology.

2. Click CMUX on intake.lead

Once the topology loads, go to the intake.lead node and click its CMUX button. That opens the intake terminal directly.

From here, give the intake agent a packet of work and watch it move through planning, build, review, and closeout.

What It Does

OpenRig is a multi-agent harness — it manages the system that coding agents form when you run them together. Not the agents themselves, but the team they create: which sessions are running, how they relate, how to recover after a reboot, and how to stop it from becoming terminal sprawl.

• Define topologies in YAML (RigSpec) with pods, edges, and continuity policies
• Boot everything with rig up — tmux sessions, harnesses, startup files, readiness checks
• See the topology in a live graph with explorer, node detail, and system log
• Discover existing Claude Code and Codex sessions in tmux and adopt them into a managed rig
• Snapshot the full topology on rig down, restore by name with rig up <name>
• Communicate across agents with rig send, rig broadcast, and rig chatroom
• Evolve running topologies with rig expand, rig shrink, rig launch, rig remove

Every agent runs in a tmux session you can attach to, inspect, and work with directly.

Starter Rigs

OpenRig ships with a conveyor starter rig for learning workflow handoff:

rig specs preview conveyor --kind rig

conveyor (rig, pod_aware)
  Starter workflow rig: a station pipeline that can move multiple
  work packets at once, with queue depth acting as natural backpressure.

  Pod: intake (1 member)
    lead — claude-code
  Pod: plan (1 member)
    planner — codex
  Pod: build (1 member)
    builder — claude-code
  Pod: review (1 member)
    reviewer — codex

For a larger human-operated product-development topology, inspect product-team:

rig specs preview product-team

Also ships: implementation-pair, adversarial-review, research-team, and secrets-manager (HashiCorp Vault managed by a specialist agent).

Browse the library: rig specs ls

How It Works

OpenRig is a local daemon + CLI + MCP server + React UI, built on tmux.

CLI / UI / MCP
      |
Hono HTTP daemon
      |
  Domain services (52)
      |
  SQLite + tmux + runtime adapters

• CLI: 40+ commands designed for both humans and agents. Every mutating command ends with what happened, current state, and next action.
• UI: Explorer sidebar, topology graph with pod grouping, node detail panel, system log, chatroom.
• MCP: 17 tools so agents can manage their own topology (rig_up, rig_ps, rig_send, rig_chatroom_send, etc.)
• Runtimes: Claude Code, Codex, and terminal nodes. Adapters for Pi and OpenCode in development.

Key Concepts

• RigSpec: Declarative multi-agent harness definition in YAML. Pods, members, edges, continuity policies, culture file.
• AgentSpec: Reusable agent blueprint with skills, guidance, hooks, profiles, and startup contracts.
• Pod: Bounded context group. Agents in a pod share memory and can maintain each other's context.
• Discovery: rig discover fingerprints existing tmux sessions. rig adopt brings them under management.
• Snapshot/Restore: rig down --snapshot captures full state. rig up <name> restores from latest snapshot. Restore reports per-node outcomes (resumed, fresh, or failed).
• RigBundle: Portable archive with vendored AgentSpecs and SHA-256 integrity. Share topologies across machines.
• Culture: CULTURE.md sets coordination norms for the group. Research rigs get exploratory culture. Implementation rigs get conservative, trust-but-verify culture.

Agent-Managed Software

A rig can package actual software alongside the agents that manage it. The shipped example is secrets-manager: a HashiCorp Vault instance operated by a specialist agent.

rig up secrets-manager
rig env status secrets-manager
rig send vault-specialist@secrets-manager "Check Vault health and report status." --verify

Requires Docker for service-backed rigs.

Requirements

• Node.js 20, 22, or 24 (even-numbered LTS releases; odd releases like 25 lack native addon prebuilds)
• tmux

Optional:

• cmux for Open CMUX node surface controls
• Docker for service-backed rigs and managed apps

Setup and Troubleshooting

• rig setup attempts core machine preparation: tmux, cmux, Claude Code, Codex, and tmux defaults. It reports what it tried and what actually succeeded. If something fails, it gives the local agent enough context to finish the job.
• rig setup --full attempts a broader operator workstation setup (jq, gh) on top of core.
• rig doctor inspects current system health and helps diagnose problems after setup. Use it when something stops working or after machine changes.

Both commands support --json for agent-driven workflows.

Managed runtime boot (during rig up) may modify runtime config for core bootstrap and spec-selected runtime resources. rig setup discloses these paths so agents know what may be changed:

• global Claude: ~/.claude/settings.json for minimal OpenRig command allowlisting
• global Claude state: ~/.claude.json for managed workspace trust and onboarding completion
• project Claude: .claude/settings.local.json for context collector/activity hooks and selected claude_settings_fragment resources
• project Claude MCP: .mcp.json for selected claude_mcp_fragment resources
• global Codex: ~/.codex/config.toml for workspace trust and selected codex_config_fragment resources

Already-running adopted sessions may need restart before they pick up newly written runtime config.

For agents: Ask the user whether they want core setup (rig setup) or the fuller workstation path (rig setup --full) before choosing the invocation. Inspect the result with --json and use rig doctor to finish any remaining machine-specific issues.

Comparison with Claude Managed Agents

Anthropic shipped Claude Managed Agents — a cloud-hosted, Claude-only runtime at $0.08/session-hour. OpenRig is the local side: open source, cross-harness, runs on your machine, costs nothing.

Full comparison

Links

• Website: openrig.dev
• Blog: Why I Built OpenRig
• Docs: openrig.dev/docs
• Open Specification: openrig.dev/specs
• Twitter: @_feralmachine

License

Apache 2.0