Harness Beta Open source
DeepSeek Harness
DeepSeek's open-source, plugin-based agent harness, in developer preview.
Get DeepSeek Harness 3 methods
Pricing
The harness is open source and free; model use is billed separately through the DeepSeek API or another configured provider.
- Free Free Open-source (MIT) harness; bring your own provider key
- DeepSeek API Pay as you go Per-token billing; deepseek-flash from $0.15/1M input and $0.60/1M output off-peak See plan ↗
Prices as listed on 19 Oct 2026.
AboutDeepSeek AI
DeepSeek Harness (dsh) is an open-source agent harness from DeepSeek AI built on the Cordis plugin system, where models, tools, skills, sessions, sandboxes and the UI are plugin rows. It runs as a desktop app, a local web UI, a CLI, an SDK or an ACP server, and uses DeepSeek or third-party OpenAI- and Anthropic-compatible providers.
Features Verified 18/20 ✓ yes ✗ no ? not verified What do these mean?
Agents
5/5 verified ✓
Multi-provider
Runs agents from several providers side by side?
yes
✓
ACP
Speaks the Agent Client Protocol?
yes
✓
Parallel agents
Runs several agent sessions at the same time?
yes
✓
Subagents
Can an agent delegate work to child agents?
yes
✓
Custom agents
Can you define your own agent roles?
yes
Workflow
5/6 verified ✓
Plan mode
Has an explicit plan / approve-before-edit step?
yes
✓
Worktrees
Keeps parallel work in separate git worktrees?
yes
✗
Checkpoints
Can you rewind code and chat to an earlier turn?
no
?
Diff review
Includes a built-in diff or review screen?
not verified
✗
PR integration
Opens and tracks pull requests from the session?
no
✓
Automations
Can it start agent runs on a schedule or event?
yes
Integrations
5/5 verified ✓
MCP
Connects to MCP servers and their tools?
yes
✓
Skills
Can you add reusable skills or commands?
yes
✓
Hooks
Can your own scripts run on agent events?
yes
✗
Issue tracker
Can it pull work from GitHub or Linear issues?
no
✓
Browser preview
Can the agent open and drive a web browser?
yes
Access & safety
3/4 verified ✓
Remote access
Can you follow or control sessions from another device?
yes
?
Cloud sandbox
Runs work in a hosted sandbox rather than on your machine?
not verified
✓
Local sandbox
Does it sandbox what agents can do locally?
yes
✓
Headless / API
Can you run it from scripts, CI, or your own code?
yes
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