How to Build Deepseek Harness Plugins

Learn how to build DeepSeek Harness plugins from scratch in this tutorial. I'll walk you through the Cordis plugin framework step-by-step, taking you from environment setup to building 3 fully functional custom AI tools. This guide covers the exact architecture, code, and configurations you need. No prior experience needed, just basic JavaScript/TypeScript knowledge. What We Build in This Tutorial: The Greet Tool: Understanding plugin anatomy Chart Generator: Integrating ECharts to generate .svg files. YouTube Researcher: Fetching video transcripts locally without a Google API key. Model Benchmarker: Running parallel LLM requests to compare cost and latency. ⏱️ Video Chapters: 0:00 - Introduction & Harness Core Concepts 1:30 - Ep 1: Anatomy of a Plugin (The Greet Tool) 14:00 - Previewing the Greet Tool 15:30 - Ep 2: Chart Generator (Headless ECharts) 31:00 - Previewing the Chart Generator Plugin 33:00 - Ep 3: YouTube Transcript Tool 37:20 - Previewing the Youtube Transcript tool 39:30 - Ep 4: Model Benchmarker (Parallel API Execution) 44:00 - Troubleshooting Common Environment Errors 46:00 - Installing Plugins Permanently (Bundles & Profiles) #deepseekharness #harness #harnessengineering #plugins #deepseekai #deepseekcoding