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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
 14 Hours

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