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Course Outline

Introduction to DeepSeek Harness

  • Overview of DeepSeek Harness and its position in the ecosystem
  • The "everything is a plugin" design principle
  • Web UI, CLI, and headless operating modes

Setup and Initial Execution

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

Model Setup

  • Configuring the DeepSeek API key
  • Choosing and changing models
  • Incorporating OpenAI-compatible endpoints

Workspaces and Sessions

  • Selecting and changing workspaces
  • The session composer and dialogue flow
  • Reading, modifying, and generating files

Executing Coding Tasks

  • Summarizing repositories and exploring code
  • Running commands and assigning tasks
  • Maintaining a structured task plan

Permissions and Sandboxing

  • Approval and permission policies
  • Restricting file and command access
  • 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 Delegation

  • Creating and forking subagents
  • Product providers for alternative coding agents
  • Distributing work across a session

The Cordis Plugin Model

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

Profiles, Bundles, and Configuration

  • Profiles and bundle layering
  • Adjusting configuration via cordis.patch.yml
  • Examining the booted tree

Core Subsystems

  • The append-only session log
  • Assembly of system prompts and tool schemas
  • The agent loop and turn sequence

Events and Extension Points

  • Session, agent, and capability events
  • Waterfall and interceptor events
  • Aligning behavior with extension points

Plugin Development

  • Registering services on context keys
  • Integrating tools and model adapters
  • Distributing and discovering plugins

SDK, Headless Mode, and Automation

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

Requirements

  • A solid grasp of software development fundamentals
  • Proficiency with the command line 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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