Quick overview
Drop a directory into ~/.hermes/plugins/ with a plugin.yaml and Python code: Start Hermes - your tools appear alongside built-in tools. The model can call them immediately.
From the official Hermes Agent documentation.
~/.hermes/plugins/my-plugin/
├── plugin.yaml # manifest
├── __init__.py # register() — wires schemas to handlers
├── schemas.py # tool schemas (what the LLM sees)
└── tools.py # tool handlers (what runs when called)