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Course Outline

Introduction to DeepSeek Harness

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

Installation and Initial Setup

  • Node.js prerequisites and package installation
  • Launching the Web UI using npx
  • Building and executing from source code

Model Configuration

  • Setting the DeepSeek API key
  • Selecting and toggling between different models
  • Integrating OpenAI-compatible endpoints

Workspaces and Sessions

  • Selecting and switching between workspaces
  • Utilizing the session composer and managing conversation flow
  • Reading, modifying, and generating files

Executing Coding Tasks

  • Summarizing repositories and navigating codebases
  • Running commands and delegating tasks
  • Maintaining a structured task plan

Permissions and Sandboxing

  • 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 Task Delegation

  • Spawning and forking subagents
  • Using product providers for other coding agents
  • Distributing work across a session

The Cordis Plugin Model

  • Plugins functioning as services, events, and effects
  • Shared context and lifecycle management
  • The absence of a privileged core

Profiles, Bundles, and Configuration

  • Managing profiles and bundle layering
  • Modifying configuration via cordis.patch.yml
  • Inspecting the booted component 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 events
  • Mapping behaviors to specific extension points

Plugin Development

  • Registering services on context keys
  • Adding tools and model adapters
  • Publishing and discovering plugins

SDK, Headless Mode, and Automation

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

Requirements

  • A solid grasp of software development fundamentals
  • Practical experience using the command line and Git
  • Basic proficiency in JavaScript or TypeScript

Target Audience

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

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