DeepSeek Harness: Building and Extending AI Coding Agents Training Course
DeepSeek Harness (dsh) serves as an open-source framework developed by DeepSeek AI, facilitating the creation and execution of AI coding agents. Leveraging the Cordis plugin framework, it adopts an "everything is a plugin" architectural model where critical components such as the model adapter, tool registry, session log, and agent loop are fully interchangeable and can be configured upon initialization.
This instructor-led, live training session, available either online or on-site, is specifically designed for software developers and AI engineers looking to leverage DeepSeek Harness for building, managing, and extending AI coding agents within their own projects.
Upon completing this training, participants will be equipped to:
- Install and execute DeepSeek Harness, including the configuration of models.
- Manage coding tasks via the Web UI and command-line interface.
- Articulate 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.
Course Format
- Engaging lectures paired with interactive discussions.
- Extensive exercises and practical application.
- Hands-on implementation within a live-lab environment.
Customization Options for the Course
- For tailored training requirements, please reach out to us to discuss arrangements.
Course Outline
Introduction to DeepSeek Harness
- Overview of DeepSeek Harness and its role in the ecosystem
- The design philosophy of "everything is a plugin"
- Exploration of Web UI, CLI, and headless modes
Installation and Initial Setup
- Node.js prerequisites and package installation
- Starting the Web UI using npx
- Building and executing from source code
Model Configuration
- Configuring the DeepSeek API key
- Selecting and switching between models
- Integrating OpenAI-compatible endpoints
Workspaces and Sessions
- Selecting and switching between workspaces
- Understanding the session composer and conversation flow
- Reading, editing, and generating files
Executing Coding Tasks
- Summarizing repositories and navigating codebases
- Executing commands and delegating tasks
- Maintaining structured task plans
Permissions and Sandbox Environment
- Approval workflows and permission policies
- Restricting file and command access
- Local and remote sandbox backends
Integrated Tools and Protocols
- Filesystem, terminal, and shell utilities
- Support for the Model Context Protocol
- Integration with the Language Server Protocol
Subagents and Task Delegation
- Spawning and forking subagents
- Product providers for other coding agents
- Distributing work across a session
The Cordis Plugin Architecture
- Plugins defined as services, events, and effects
- Shared context and lifecycle management
- Reasons for the absence of a privileged core
Profiles, Bundles, and Configuration
- Layering profiles and bundles
- Modifying configuration via cordis.patch.yml
- Inspecting the initialized component tree
Core Subsystems
- The append-only session log mechanism
- Assembly of system prompts and tool schemas
- Agent loop mechanics and turn flow
Events and Extension Points
- Session, agent, and capability events
- Waterfall and interceptor event handling
- Aligning behavior with specific extension points
Plugin Development
- Registering services on context keys
- Incorporating tools and model adapters
- Publication and discovery of plugins
SDK, Headless Operation, and Automation
- Controlling the harness from external processes
- Utilizing the TypeScript and Python SDKs
- Automation via CLI and headless modes
Requirements
- A solid grasp of software development fundamentals
- 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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