DeepSeek Harness: Building and Extending AI Coding Agents Training Course
DeepSeek Harness (dsh) is an open-source framework developed by DeepSeek AI, designed to facilitate the creation and execution of AI coding agents. Utilizing the Cordis plugin framework, it adopts an "everything is a plugin" architecture. In this model, the model adapter, tool registry, session log, and agent loop are all modular components that can be replaced or configured during the startup process.
This live, instructor-led training (available online or onsite) is tailored for software developers and AI engineers looking to leverage DeepSeek Harness to develop, manage, and extend AI coding agents within their projects.
Upon completion of this training, participants will be equipped to:
- Install and execute DeepSeek Harness, as well as configure the underlying models.
- Manage coding tasks via the Web UI and command-line interface.
- Describe the Cordis plugin architecture and identify its key extension points.
- Create and release custom plugins for the harness environment.
- Automate harness operations using the SDK and headless mode.
Course Structure
- Interactive lectures and facilitated discussions.
- Extensive exercises and practical application.
- Hands-on implementation within a live lab setting.
Customization Options
- Please contact us to discuss arrangements for a tailored training experience.
Course Outline
Introduction to DeepSeek Harness
- Overview of DeepSeek Harness and its role in the ecosystem
- The "everything is a plugin" architectural philosophy
- Web UI, CLI, and headless operational modes
Setup and Initial Launch
- Node.js dependencies and package installation
- Starting the Web UI using npx
- Compiling and running from the source code
Model Setup
- Configuring the DeepSeek API key
- Choosing and switching between models
- Incorporating OpenAI-compatible endpoints
Workspaces and Sessions
- Selecting and changing active workspaces
- Using the session composer to manage conversation flow
- Performing file reading, editing, and generation tasks
Executing Coding Tasks
- Summarizing repositories and navigating codebases
- Running commands and delegating specific tasks
- Maintaining and updating task plans
Permissions and Sandbox Environment
- Defining approval and permission policies
- Restricting file and command access
- 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
- Using product providers for external coding agents
- Distributing work across a session
The Cordis Plugin Architecture
- Plugins defined as services, events, and effects
- Shared context and lifecycle management
- The absence of a privileged core component
Profiles, Bundles, and Configuration
- Layering profiles and bundles
- Modifying configuration via cordis.patch.yml
- Reviewing the boot tree structure
Core Subsystems
- The append-only session logging mechanism
- Assembly of system prompts and tool schemas
- The agent loop and turn-based processing flow
Events and Extension Points
- Session, agent, and capability events
- Waterfall and interceptor event handling
- Linking behaviors to specific extension points
Plugin Development
- Registering services using context keys
- Incorporating new tools and model adapters
- Publishing and locating available plugins
SDK, Headless Mode, and Automation
- Controlling the harness from external processes
- Utilizing TypeScript and Python SDKs
- Implementing CLI and headless automation workflows
Requirements
- A solid grasp of fundamental software development concepts
- Practical experience with command-line tools and Git
- Familiarity with basic 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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