Zero for Hermes Agent

How to install Zero in Hermes Agent and keep it up to date.

Requires Hermes Agent v2026.6.19 or newer (hermes --version).

Install

From the terminal

hermes plugins install officialzeroxyz/zero-plugins/plugins/zero-hermes/hermes --force --enable

This installs and enables the Zero plugin (hooks, the /zero command, and the Zero skill) from this repository.

Start a new Hermes session, then use /zero or ask Hermes: "Help me set up and test Zero." It walks you through signing in with zero auth login — a device-code login persisted to ~/.zero, shared with every other Zero install on the machine.

If you run Hermes in an ephemeral environment where a session can't persist to disk, add the Zero MCP server instead and authorize through it:

hermes mcp add zero --url https://mcp.zero.xyz --auth oauth

Staying up to date

• The Zero runner (the zero CLI) updates at the start of each session.

• To update the plugin itself, re-run the install command — with --force it replaces the installed copy with the latest:

  hermes plugins install officialzeroxyz/zero-plugins/plugins/zero-hermes/hermes --force --enable
  

  Note: hermes plugins update zero does not work for this plugin — Hermes installs it from a repo subdirectory, which keeps no .git folder to pull from. The --force reinstall above is the update path.