DeepSeek Harness (DSH)

Open-source agent framework where every capability is an installable npm plugin

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About DeepSeek Harness (DSH)

DeepSeek Harness (DSH) is an open-source agent framework released by DeepSeek in August 2026. Its core concept is that every tool, capability, and integration is implemented as an npm plugin rather than being built into the core system. This plugin-based architecture allows users to add only the functionality they need, reducing bloat and enabling customization. DSH is positioned as an alternative to proprietary agent frameworks like Claude Code, offering an open-source option with community-driven extensions. The framework supports both headless and web-based agent operations, with a verification process that tests plugin installation, loading, and execution before marking them as verified. Users interact with DSH through a web interface, configuring models, workspaces, and tasks via a local server running on port 3080. The project includes a growing directory of over 7,794 plugins, with 2,033 verified through a multi-level testing process that includes live execution checks.

Key features

Everything-is-a-plugin architecture
npm-based plugin ecosystem
Headless and web agent execution modes
Verified plugin directory with L1–L4 testing
Local web interface for configuration
Workspace and task management
Model configuration via Settings panel
Scene packs with verified plugin setups

Use cases

Building custom agent workflows with specific plugin combinations
Testing and auditing plugins before integration into production
Developing and debugging agent tasks in a controlled environment

Pros

Plugin-based architecture for modular and lightweight agent setup
Open-source framework with community-driven extensions and audits
Supports both headless and web-based agent operations
Verified plugin directory with real installation and execution tests
Local web interface for configuration and task management

Cons

Requires DeepSeek API key for model access, which is a paid service
Developer-preview status may indicate instability or incomplete features
Limited to English and Chinese language support on the website

Frequently asked questions about DeepSeek Harness (DSH)

What is DeepSeek Harness (DSH)?

DeepSeek Harness (DSH) is an open-source agent framework released by DeepSeek in August 2026. Its defining concept is that every capability, tool, or integration is implemented as an npm plugin rather than being built into the core system.

Is DeepSeek Harness free to use?

DeepSeek Harness itself is open-source and free to use. However, the underlying DeepSeek API (such as V4-Pro) is a paid service with pricing determined by DeepSeek.

How does DSH differ from Claude Code?

Architecturally, DSH follows an everything-is-a-plugin model where capabilities are npm packages, while Claude Code relies on MCP servers. DSH offers an open-source alternative with a plugin-based ecosystem.

What does 'verified' mean for plugins in DSH?

A 'verified' plugin in DSH has passed a multi-level testing process, including real installation, loading, and execution checks. This goes beyond simple manifest validation to ensure functionality.

How do I get started with DeepSeek Harness?

To get started, install DSH using the command 'npx @deepseek-ai/dsh web', then open http://127.0.0.1:3080 in a browser. Enter your DeepSeek API key, configure the model, choose a workspace, and begin running tasks.

Does DSH support both headless and web-based agent operations?

Yes, DSH supports both headless and web-based agent operations. Web-only plugins undergo additional testing via live web profiles and browser CDP checks.