Build & extend
This tutorial creates a minimal Harness plugin and loads it into the Web UI. Start from a repository checkout that has completed the run-from-source path.
This tutorial adds a greet tool to the Web UI. Complete Your first plugin first and keep its scratch-plugin directory.
Accept configuration supplied through cordis.yml.
The previous tutorials loaded a local plugin through a --patch overlay. This tutorial packages it as an installable bundle, installs it into a profile with dsh plugin add, and explains the layer order that determines the composed configuration. It assumes the dsh CLI is installed. Complete plugin configuration first.
To use a fresh source checkout instead, complete the run-from-source section, keep this tutorial’s hello-plugin directory at the repository root, and run the remaining dsh ... commands from there as pnpm dsh .... See source execution for build and launcher behavior.
This page has two parts: a concept reference for the three-role capability pattern, followed by an advanced tutorial that builds one capability. Complete the basic plugin path and services tutorial first.
This guide connects a new LLM provider to Harness.