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Course Outline

Overview of DeepSeek Harness

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

Setup and Initial Execution

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

Model Setup

  • Configuring the DeepSeek API key
  • Selecting and switching between models
  • Integrating OpenAI-compatible endpoints

Workspaces and Sessions

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

Executing Coding Tasks

  • Summarizing repositories and navigating codebases
  • Running commands and delegating tasks
  • Managing and maintaining task plans

Permissions and Sandbox Environment

  • Defining approval and permission policies
  • Restricting file and command access
  • Configuring 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

Sub-agents and Task Delegation

  • Creating and forking sub-agents
  • Product providers for integrating other coding agents
  • Distributing work across sessions

The Cordis Plugin Model

  • Plugins defined 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
  • Modifying configuration via cordis.patch.yml
  • Reviewing the boot process tree

Core Subsystems

  • The append-only session log structure
  • Assembly of system prompts and tool schemas
  • Understanding the agent loop and turn flow

Events and Extension Points

  • Handling session, agent, and capability events
  • Managing waterfall and interceptor events
  • Aligning behavior with specific extension points

Plugin Development

  • Registering services under specific context keys
  • Incorporating tools and model adapters
  • Releasing and discovering plugins

SDK, Headless Mode, and Automation

  • Controlling the harness from external processes
  • Utilizing TypeScript and Python SDKs
  • Implementing CLI and headless automation

Requirements

  • A solid grasp of software development basics
  • Proficiency with command-line tools and Git
  • Familiarity with JavaScript or TypeScript

Target Audience

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

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