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Course Outline

Introduction to DeepSeek Harness

  • Defining DeepSeek Harness and its role in the ecosystem
  • The "everything is a plugin" design philosophy
  • Web UI, CLI, and headless operating modes

Setup and Initial Launch

  • Node.js prerequisites and package installation
  • Starting the Web UI using npx
  • Compiling and running from source code

Model Configuration

  • Configuring the DeepSeek API key
  • Choosing and toggling between different models
  • Integrating OpenAI-compatible endpoints

Workspaces and Session Management

  • Selecting and navigating between workspaces
  • Understanding the session composer and conversation flow
  • Reading, modifying, and creating files

Executing Coding Tasks

  • Summarizing repositories and traversing codebases
  • Executing commands and offloading tasks
  • Maintaining an organized task plan

Permissions and Sandboxing

  • Defining approval and permission policies
  • Restricting access to files and commands
  • 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
  • Product providers for alternative coding agents
  • Distributing workloads across sessions

The Cordis Plugin Model

  • Viewing plugins as services, events, and effects
  • Shared context and lifecycle management
  • The absence of a privileged core system

Profiles, Bundles, and Settings

  • Layering profiles and bundles
  • Modifying configuration via cordis.patch.yml
  • Reviewing the initialized component tree

Core Subsystems

  • The append-only session logging system
  • Assembly of system prompts and tool schemas
  • Agent loop mechanics and turn progression

Events and Extension Hooks

  • Session, agent, and capability-related events
  • Waterfall and interceptor event patterns
  • Aligning behaviors with specific extension points

Plugin Development

  • Registering services under context keys
  • Implementing new tools and model adapters
  • Publishing and discovering available plugins

SDK, Headless Mode, and Automation

  • Controlling the harness from external processes
  • Using the TypeScript and Python SDKs
  • Automating workflows via CLI and headless mode

Requirements

  • A solid grasp of fundamental software development concepts
  • Proficiency in using the command line and Git
  • Basic knowledge of JavaScript or TypeScript

Target Audience

  • Software developers
  • AI and machine learning engineers
  • DevOps and platform engineers
 14 Hours

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