DeepSeek Harness: Building and Extending AI Coding Agents Training Course
DeepSeek Harness (dsh) is an open-source framework from DeepSeek AI designed for the creation and execution of AI coding agents. Leveraging the Cordis plugin framework, it adopts an "everything is a plugin" architecture, meaning that the model adapter, tool registry, session logs, and the agent loop function as interchangeable components that can be configured at startup.
This live, instructor-led training—available either online or on-site—is tailored for software developers and AI engineers who want to utilize DeepSeek Harness to construct, manage, and expand AI coding agents within their own projects.
Upon completion of this course, participants will be equipped to:
- Install DeepSeek Harness, run it, and configure specific models.
- Execute coding tasks via the Web interface or command line.
- Describe the Cordis plugin architecture and its various extension points.
- Create and release custom plugins for the harness.
- Automate harness operations using the SDK and headless mode.
Course Format
- Interactive lectures and group discussions.
- Extensive exercises and practical drills.
- Hands-on implementation within a live laboratory environment.
Customization Options
- Please reach out to us to discuss arrangements for a customized training experience.
Course Outline
Introduction to DeepSeek Harness
- Defining DeepSeek Harness and its role in the ecosystem
- The "everything is a plugin" design philosophy
- Web UI, CLI, and headless operating modes
Setup and Initial Launch
- Node.js prerequisites and package installation
- Starting the Web UI using npx
- Compiling and running from source code
Model Configuration
- Configuring the DeepSeek API key
- Choosing and toggling between different models
- Integrating OpenAI-compatible endpoints
Workspaces and Session Management
- Selecting and navigating between workspaces
- Understanding the session composer and conversation flow
- Reading, modifying, and creating files
Executing Coding Tasks
- Summarizing repositories and traversing codebases
- Executing commands and offloading tasks
- Maintaining an organized task plan
Permissions and Sandboxing
- Defining approval and permission policies
- Restricting access to files and commands
- Utilizing local and remote sandbox backends
Native Tools and Integrations
- Filesystem, terminal, and shell utilities
- Support for the Model Context Protocol
- Integration with the Language Server Protocol
Subagents and Task Delegation
- Creating and forking subagents
- Product providers for alternative coding agents
- Distributing workloads across sessions
The Cordis Plugin Model
- Viewing plugins as services, events, and effects
- Shared context and lifecycle management
- The absence of a privileged core system
Profiles, Bundles, and Settings
- Layering profiles and bundles
- Modifying configuration via cordis.patch.yml
- Reviewing the initialized component tree
Core Subsystems
- The append-only session logging system
- Assembly of system prompts and tool schemas
- Agent loop mechanics and turn progression
Events and Extension Hooks
- Session, agent, and capability-related events
- Waterfall and interceptor event patterns
- Aligning behaviors with specific extension points
Plugin Development
- Registering services under context keys
- Implementing new tools and model adapters
- Publishing and discovering available plugins
SDK, Headless Mode, and Automation
- Controlling the harness from external processes
- Using the TypeScript and Python SDKs
- Automating workflows via CLI and headless mode
Requirements
- A solid grasp of fundamental software development concepts
- Proficiency in using the command line and Git
- Basic knowledge of JavaScript or TypeScript
Target Audience
- Software developers
- AI and machine learning engineers
- DevOps and platform engineers
Open Training Courses require 5+ participants.
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