OpenHarnessA new space to work with agents
Free agents.
Your way.
AI evolves. The way you work can still be your own. Talk to agents, design your harnesses, and shape what comes next.
Desktop in development An open model by design
An agent has a role, instructions, and a provider. The harness defines how its work connects to the rest.
Tap the parts to explore the model.
A prompt starts the conversation.
A harness organizes the work.
Roles, context, skills, criteria, and human decisions.
The parts of a method, explicitly connected.
Meet the desktop
From conversation
to system.
Start with the task. Open the Studio when you want to design the method behind it. A space for each part of the work.
Design roles. Connect signals. Inspect the method.
Screenshot from September 2026. The interface has changed since.Your task starts in a conversation, with the provider and harness in view.
Screenshot from September 2026. The interface has changed since.Included in the app
Three harnesses
to open and edit.
The desktop ships three ready-made harnesses. Open any of them in the Studio as an editable copy; the original never changes. None comes with a provider set or with credentials: the connection is your choice. Today the app connects Anthropic and OpenAI through their local CLIs, OpenRouter, Ollama, and Cursor.
The last two are modeled on projects published by third parties. Their presence here does not indicate affiliation or endorsement.
Open Harness Model
Your method.
In one file.
OHM is the document that describes a harness: who takes part, how work moves forward, and what content guides each role.
Readable YAML, a versioned structure, and the extension .ohm. Made to inspect, compare, and share without hiding the method inside an interface.
YAML is the format adopted for OHM. Desktop support is being migrated: the harnesses bundled in the app and the CLI use YAML, but Studio import and export still write JSON inside the .ohm file.
Interpretable by tools.YAML
1.2
Example of the adopted format · support being migrated
Identity and intent.
A name, version, participants, and connections make the method explicit.
Knowledge included.
Prompts, agents, and skills travel with the harness description.
Execution with context.
Execution preferences and a validation profile complete the document.
OpenHarness Manifesto
The future of agents deserves an open method.
We are building OpenHarness around a conviction: the way we work with artificial intelligence should be understandable, open to discussion, and carried forward by the people using it.
Read the full manifesto
A proposal taking shape.An invitation to build it together.
- 01
The method belongs to those doing the work.
Your knowledge deserves to exist beyond the tool you chose today.
- 02
What guides the work should be visible.
Roles, instructions, and criteria need to be readable, reviewable, and open to discussion.
- 03
Open connections expand your choices.
Providers and tools may change. The intent of the work should remain understandable.
- 04
Autonomy calls for clear limits.
Explicit permissions, checkpoints, and human authority are part of the method.
- 05
Quality needs evidence.
A result should be open to inspection. Trust is built through criteria and records.
- 06
An open model evolves in public.
Examples, criticism, and different implementations help improve what everyone can use.
These principles guide the project. They are not guarantees of completed features.
An ecosystem taking shape
Part of a
bigger conversation.
Prompts guide. Skills bring knowledge together. Context gives a task meaning. Protocols connect tools and agents. OHM proposes organizing these parts into a working method you can read, review, and share.
Practices and specifications that help frame the ecosystem. Each has its role; inclusion here does not mean an integration is already available in OpenHarness.
The OpenHarness mascot.
A familiar presence
Meet Nilo.
Our owl keeps you company in OpenHarness. Attentive to detail, Nilo thinks, works at a computer, and responds to a greeting.
These gestures give the product personality and help convey its moments: a task in progress, a pause, or a completion.
An 8-second scene featuring the mascot's expressions. Pause and resume with the button or by clicking Nilo.
Start with what is yours
Open the model.
Imagine your next harness.
The desktop is in development.
For now, explore the model and the proposal.