DeepSeek Harness: Building and Extending AI Coding Agents Training Course
DeepSeek Harness (dsh) serves as an open-source agent framework from DeepSeek AI, designed for the creation and execution of AI coding agents. Operating on the Cordis plugin framework, it adopts an "everything is a plugin" architecture where key components—such as the model adapter, tool registry, session log, and agent loop—are modular and configurable at startup.
This instructor-led, live training session (available online or on-site) is tailored for software developers and AI engineers looking to leverage DeepSeek Harness to construct, manage, and extend AI coding agents within their own projects.
Upon completion of this training, participants will be equipped to:
- Install and execute DeepSeek Harness, including model configuration.
- Manage coding tasks via the Web UI and command line interface.
- Describe the Cordis plugin architecture and its various extension points.
- Create and distribute custom plugins for the harness.
- Automate harness operations using the SDK and headless mode.
Training Format
- Interactive lectures and group discussions.
- Extensive practical exercises and drills.
- Live-lab implementation sessions for hands-on practice.
Customization Options
- Contact us to arrange a customized training program to suit your specific needs.
Course Outline
Introduction to DeepSeek Harness
- Defining DeepSeek Harness and its role in the ecosystem
- The "everything is a plugin" design principle
- Overview of Web UI, CLI, and headless modes
Setup and Initial Launch
- Node.js prerequisites and package installation
- Starting the Web UI using npx
- Compiling and running from source code
Model Setup
- Configuring the DeepSeek API key
- Selecting and switching between models
- Integrating OpenAI-compatible endpoints
Workspaces and Sessions
- Managing and switching between workspaces
- Using the session composer and dialogue flow
- File operations: reading, editing, and generation
Executing Coding Tasks
- Repository summarization and code navigation
- Command execution and task delegation
- Maintaining and updating task plans
Permissions and Sandbox Environment
- Defining approval and permission policies
- Restricting file and command access
- Implementing local and remote sandbox backends
Native Tools and Integrations
- Filesystem, terminal, and shell utilities
- Support for Model Context Protocol
- Integration with Language Server Protocol
Subagents and Delegation Strategies
- Creating and forking subagents
- Product providers for external coding agents
- Distributing work across a session
The Cordis Plugin Architecture
- Plugins functioning as services, events, and effects
- Understanding shared context and lifecycle
- The rationale behind the absence of a privileged core
Profiles, Bundles, and Settings
- Layering profiles and bundles
- Modifying configuration via cordis.patch.yml
- Examining the initialized configuration tree
Core System Components
- The append-only session logging mechanism
- Assembly of system prompts and tool schemas
- Flow of the agent loop and turns
Events and Extension Capabilities
- Handling session, agent, and capability events
- Managing waterfall and interceptor events
- Aligning behaviors with specific extension points
Plugin Development
- Registering services under context keys
- Incorporating new tools and model adapters
- Distributing and locating plugins
SDK, Headless Mode, and Automation
- Controlling the harness from external processes
- Utilizing TypeScript and Python SDKs
- Automating via CLI and headless operations
Requirements
- A solid grasp of fundamental software development concepts
- Proficiency with command-line tools 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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