DeepSeek Harness: Building and Extending AI Coding Agents Training Course
DeepSeek Harness (dsh) is an open-source framework developed by DeepSeek AI, designed for constructing and executing AI coding agents. Built upon the Cordis plugin framework, it employs an "everything is a plugin" architecture, ensuring that key components such as the model adapter, tool registry, session log, and agent loop are modular and replaceable at startup.
This instructor-led live training, available both online and on-site, is tailored for software developers and AI engineers looking to leverage DeepSeek Harness to create, manage, and expand AI coding agents within their own projects.
Upon completion of this training, participants will be equipped to:
- Install and operate DeepSeek Harness while configuring various models.
- Manage coding tasks via the Web UI and command-line interface.
- Understand the Cordis plugin architecture and its specific extension points.
- Create and release custom plugins tailored for the harness.
- Automate harness operations using the SDK and headless mode.
Course Structure
- Engaging lectures and interactive discussions.
- Extensive exercises and practical application opportunities.
- Hands-on implementation within a live laboratory environment.
Course Customisation Options
- Please contact us to discuss and arrange customised training solutions.
Course Outline
Introduction to DeepSeek Harness
- Overview of DeepSeek Harness and its role in the ecosystem
- The "everything is a plugin" design philosophy
- Web UI, CLI, and headless operational modes
Installation and Initial Setup
- Node.js requirements and package installation
- Launching the Web UI using npx
- Building and executing from source code
Model Configuration
- Configuring the DeepSeek API key
- Selecting and switching between different models
- Integrating OpenAI-compatible endpoints
Workspaces and Sessions
- Selecting and navigating between workspaces
- Understanding the session composer and conversation flow
- Reading, editing, and generating files
Executing Coding Tasks
- Summarising repositories and navigating codebases
- Running commands and delegating tasks
- Maintaining and tracking task plans
Permissions and Sandbox
- Managing approval and permission policies
- Restricting file and command access
- Configuring local and remote sandbox backends
Built-in Tools and Integrations
- Filesystem, terminal, and shell utilities
- Support for the Model Context Protocol
- Integration with the Language Server Protocol
Subagents and Delegation
- Creating and forking subagents
- Utilising product providers for other coding agents
- Delegating work across multiple sessions
The Cordis Plugin Model
- Plugins functioning as services, events, and effects
- Shared context and lifecycle management
- The rationale behind the absence of a privileged core
Profiles, Bundles, and Configuration
- Layering profiles and bundles
- Patching configuration via cordis.patch.yml
- Inspecting the initialised system tree
Core Subsystems
- The append-only session log
- Assembly of system prompts and tool schemas
- The agent loop and turn-based flow
Events and Extension Points
- Session, agent, and capability events
- Waterfall and interceptor event handling
- Aligning behaviour with specific extension points
Plugin Development
- Registering services using context keys
- Implementing custom tools and model adapters
- Publishing and discovering available plugins
SDK, Headless Mode, and Automation
- Controlling the harness from external processes
- Utilising TypeScript and Python SDKs
- Automating workflows via CLI and headless mode
Requirements
- A solid grasp of software development fundamentals
- Practical experience with command-line tools and Git
- Basic proficiency in 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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