Most of this series treats Hermes as the place its ideas land. Building Your Agentic OS pivots to it, Running the Fleet orchestrates on it, Self-Hosting the Agentic Stack deploys it. What none of them do is sit down and cover Hermes itself, the whole thing, every feature, the way I'd walk a competent developer through a tool they've never run in anger.

That's this guide. Hermes is Nous Research's open-source, self-hosted agent, the one with a built-in learning loop: it writes its own skills from experience, curates its own memory, searches its own past conversations, and builds a deepening model of who you are across sessions. It installs with one command, runs on a five-dollar box or a GPU cluster, talks to whatever model you point it at, and you can message it from Telegram while it works on a cloud VM. That surface is a lot bigger than the rest of the series has needed to show.

So here we go wide instead of deep: install and first contact, the model layer and Nous Portal, the terminal interface, the messaging gateway across six platforms, the six places it can run, the learning loop, context files and personality, tools and toolsets, MCP, scheduled automations, delegation and subagents, the security model, day-two operations, and migrating in from OpenClaw. Where a topic has its own field guide in this series, I point you there instead of repeating it. This is the manual that ties the rest together.

This is a living document and will be updated as Hermes updates.