OpenClaw
Coming soon.
Open HarnessMaintained by MifuneRun coding agents in a sandbox, not on your machine.
Open Harness connects one repository to an isolated, persistent Docker workspace. Bring your preferred coding agent, keep its toolchain off your host, then self-host it or choose Mifune-managed Open Harness Cloud.
Need hands-on help? Explore Mifune engineering supportMIT licensed · one repo / one sandbox · no host toolchains
open-harness-flow.mifune
Repository connectedOne project linked to its workspace
Sandbox isolatedPersistent Docker environment; tools stay off host
Agent launchedYour preferred coding CLI runs inside the sandbox
Operator choosesMifune-managed Cloud or self-hosted
Sandbox
Isolated
Coding agent
Your choice
MIFUNE OPEN SOURCE
Open infrastructure, built in public.
Explore Open Harness and related Mifune agent projects on GitHub. Read the code, inspect how the pieces work, and evaluate the projects for your workflow.
openharness
mifunedev/openharness
An open, isolated Docker workspace for running coding agents with your preferred harness.
TypeScript(opens in a new tab)orchestra
mifunedev/orchestra
Steerable harnesses for DeepAgents and multi-agent automation.
Python(opens in a new tab)a2a-langgraph
mifunedev/a2a-langgraph
Agent-to-agent protocol experiments built on LangGraph for interoperable, conversational AI workers.
Python(opens in a new tab)SUPPORTED HARNESSES
Pick your agent.
Claude Code, Codex, and Pi ship preinstalled. OpenCode, DeepAgents, Hermes, and Grok Build are opt-in image installs. Switch between them inside the sandbox — or add your own by editing the Dockerfile.
Claude Code
Anthropic's terminal coding agent.
(opens in a new tab)
Codex
OpenAI's CLI coding agent.
(opens in a new tab)OpenCode
Terminal agent with OpenAI OAuth support.
(opens in a new tab)Pi
A lightweight, customizable agent.
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DeepAgents
LangChain's multi-provider terminal agent.
(opens in a new tab)Hermes
Nous Research's self-improving agent CLI.
(opens in a new tab)Grok Build
xAI's terminal coding agent and CLI.
(opens in a new tab)
T3 Code
Browser UI over Claude/Codex/OpenCode (port 3773).
(opens in a new tab)
Open HarnessOPEN SOURCE · MAINTAINED BY MIFUNEPORTABLE AGENT HARNESS
One repo. One sandbox.
Open Harness is the portable layer between your repository and your coding agent. The repository defines one isolated, persistent Docker workspace, so the agent gets a consistent environment and your machine stays clean.
Isolation by default
Keep one project and its toolchain in one Docker sandbox instead of installing project dependencies on your host.
Local or remote
Use the same persistent workspace locally or on a remote VM, with your preferred coding agent inside it.
Worktrees for parallel work
Use isolated git worktrees for parallel branches and delegated work without mixing their working directories.
Open Harness options
Managed Cloud first. Self-host when you want control.
Choose Mifune-managed Open Harness Cloud or operate the MIT-licensed project yourself. Cloud customers can add Mifune engineering support when adoption needs hands-on help.
Open HarnessCLOUD · MANAGED BY MIFUNERecommended · Managed by Mifune
Open Harness Cloud
Give coding agents an isolated, persistent Open Harness workspace while Mifune operates the managed environment.
- Persistent workspace for coding agents
- Environment operated by Mifune
- Start in the Mifune Cloud Console
Open HarnessOPEN SOURCE · MAINTAINED BY MIFUNESelf-hosted · Maintained by Mifune
Open Harness Open Source
Inspect, adapt, and operate the MIT-licensed Open Harness workspace yourself, locally or on a remote VM.
- Claude Code, Codex, Pi, and other opt-in CLIs
- Local or remote Docker workspace
- Isolated git worktrees for parallel branches
Common questions
Open Harness, clearly explained.
What the workspace does, who operates it, and how Mifune can help.
Open Harness is an MIT-licensed, isolated, persistent Docker workspace for coding agents. It keeps one project and its toolchain in one sandbox and supports Claude Code, Codex, Pi, and other opt-in agent CLIs.
Open Harness keeps project toolchains off your host and gives coding agents a workspace that persists between sessions. It can run locally or on a remote VM; remote agents can work unattended or on schedules and can be reachable over Slack. Isolated git worktrees support parallel branches and delegation.
Mifune maintains the open-source Open Harness project, operates Open Harness Cloud as the managed path, and offers forward-deployed engineering support to Cloud customers.
With Open Harness Cloud, Mifune operates the managed environment. With open source, your team can inspect and adapt Open Harness, then operate it locally or on a remote VM. Choose based on who should own the environment and review each destination for path-specific details.
Forward-deployed support is optional for Open Harness Cloud customers who want Mifune engineers alongside their team to plan, implement, integrate, troubleshoot, or hand off a Cloud deployment.
Open console.mifune.dev for the managed Cloud path. Visit github.com/mifunedev/openharness and read the docs at oh.mifune.dev for the self-hosted path. Email [email protected] to discuss engineering support for Cloud.
CLOUD · DEPLOYMENT
Discuss your Open Harness deployment.
Tell us how your team plans to run coding agents. We’ll use the details to discuss Open Harness Cloud and, for Cloud customers, optional hands-on deployment support.
- A persistent, isolated workspace for your coding agents
- A Mifune-managed Open Harness Cloud option
- Optional hands-on deployment support for Cloud customers
Tell us about your deployment
Share enough context for a useful first reply.