Harness Engineering

Build the layer that turns a model into an agent — the loop, the prompt, the tool surface, the sandbox, subagents and compaction. One course, 10 lessons.

Free, but it needs an account. Your progress is saved, so you can stop on the train and pick up on the sofa.

What's included

• 01Building a HarnessAssemble a working agent harness from scratch in Python: the loop, a versioned system prompt, a tool surface, a sandbox and permission modes, hooks, subagents, compaction, and the traces that let you debug it.10 lessons · ~110 min