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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" 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
 14 Hours

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Price per participant

Provisional Upcoming Courses (Require 5+ participants)

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