DeepSeek Harness: Building and Extending AI Coding Agents Training Course
DeepSeek Harness (dsh) is an open-source agent framework developed by DeepSeek AI, designed to facilitate the construction and execution of AI coding agents. Underpinned by the Cordis plugin framework, it adopts an "everything is a plugin" architecture. This design ensures that key components, including the model adapter, tool registry, session log, and agent loop, are fully replaceable and can be configured during the boot process.
This instructor-led live training, available online or on-site, is tailored for software developers and AI engineers who intend to leverage DeepSeek Harness to build, operate, and extend AI coding agents within their own projects.
Upon completing this training, participants will be equipped to:
- Install and execute DeepSeek Harness, along with configuring various models.
- Manage coding tasks via the Web UI and the command line interface.
- Describe the Cordis plugin architecture and its specific extension points.
- Create and release custom plugins for the harness.
- Automate harness operations through the SDK and headless mode.
Course Structure
- Interactive lectures and facilitated discussions.
- Extensive exercises and practical drills.
- Hands-on implementation within a live lab environment.
Customization Options
- For tailored training requirements, please contact us to make the necessary arrangements.
Course Outline
Introduction to DeepSeek Harness
- Overview of DeepSeek Harness and its role in the ecosystem
- The "everything is a plugin" design principle
- Web UI, CLI, and headless operational modes
Setup and Initial Execution
- 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 swapping between models
- Integrating OpenAI-compatible endpoints
Workspaces and Session Management
- Selecting and changing active workspaces
- Utilizing the session composer and managing conversation flow
- Reading, modifying, and generating files
Executing Coding Tasks
- Summarizing repositories and navigating codebases
- Executing commands and delegating specific tasks
- Maintaining and updating task plans
Permissions and Sandbox Environments
- Managing 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 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 work across a single session
The Cordis Plugin Model
- Defining plugins as services, events, and effects
- Understanding shared context and lifecycle management
- Rationale for the absence of a privileged core
Profiles, Bundles, and Configuration
- Managing profiles and bundle layering
- Modifying configuration via cordis.patch.yml
- Reviewing the booted configuration tree
Core System Components
- The append-only session logging mechanism
- Assembly of system prompts and tool schemas
- Managing the agent loop and turn processing
Events and Extension Points
- Handling session, agent, and capability events
- Working with waterfall and interceptor events
- Aligning behaviour with specific extension points
Plugin Development
- Registering services using context keys
- Implementing new tools and model adapters
- Releasing and locating plugins
SDK, Headless Operation, and Automation
- Controlling the harness from external processes
- Utilising the TypeScript and Python SDKs
- Automating workflows via CLI and headless mode
Requirements
- A solid grasp of fundamental software development concepts
- Proficiency with 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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