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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
 14 Hours

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