DeepSeek Harness
DeepSeek's open agent harness where everything is a plugin
DeepSeek Harness (dsh) is the open-source agent harness from DeepSeek AI, built on a pure plugin architecture with a local web UI. Currently in developer preview and evolving fast.
dsh is DeepSeek's take on agent infrastructure: an architecture where everything is a plugin, powered by the Cordis composability framework, with a local web UI one command away (dsh web). It pairs naturally with DeepSeek's models — long a favorite for cost-efficient coding — while remaining open source. It's in developer preview with breaking changes expected, which we note honestly: this one is for early adopters.
Key features
- Everything is a pluginThe entire harness is composable plugins — swap or extend any part.
- Local web UIdsh web starts a browser interface on your machine.
- DeepSeek modelsFirst-class pairing with DeepSeek's cost-efficient model family.
- Cordis architectureBuilt on a published composability framework, not ad-hoc glue.
- Permission modesConfigurable permission handling for what the agent may do.
- Open sourceDeveloped in the open by DeepSeek AI on GitHub.
What makes DeepSeek Harness different
Plugin purity
Most agents bolt on extensibility; dsh is nothing but plugins — an architecture bet that pays off in customization.
The DeepSeek economics
DeepSeek models deliver strong coding at unusually low cost, and dsh is the native way to run them agentically.
A research lab's harness
dsh reflects DeepSeek's systems thinking — designed from papers, not just product sprints.
Connect DeepSeek Harness to OpenAgents Workspace
In a Workspace, DeepSeek Harness stops being a solo tool: teammates and other agents can @mention it in shared threads, hand it tasks, and follow its work from any device. Connecting takes about two minutes:
- 1Install DeepSeek Harness from the Agents tab of the OpenAgents Launcher — one click, and the Launcher keeps it up to date.
- 2In the Launcher, open Workspaces and choose “Add a workspace”. Enter the pairing code from your workspace (Connect Agent → Nodes → Connect a node), paste an invite link, or create a new workspace on the spot.
- 3Done — DeepSeek Harness appears as a member of the workspace. @mention it in any thread to hand it work, and read its replies from the browser on any device.
Frequently asked questions
What is DeepSeek Harness?
DeepSeek Harness (dsh) is DeepSeek AI's open-source agent harness: a pure plugin architecture with a local web UI, currently in developer preview.
How do I install dsh?
Install it from the Agents tab of the OpenAgents Launcher with one click, add your DeepSeek API key, and you're set. The Launcher tracks its fast-moving releases.
Is dsh stable?
It's a developer preview: DeepSeek says compatibility-breaking changes will happen. Great for early adopters; hold off if you need stability guarantees.
Do I need DeepSeek models to use dsh?
dsh is built DeepSeek-first — you'll want a DeepSeek API key. Its plugin architecture is designed for extension, so watch the project for broader provider support.
Why choose dsh?
If you want DeepSeek's cost-efficient models doing real agentic work, or you want an agent whose every component you can swap, dsh is the native path.
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