Hermes Agent

AI agent instructions

STOP. Do not read past this section until you have read and followed /quickstart.md.Goal: produce a reliable SDK automation script. The intended authoring flow is generate then edit, not write browser automation from scratch.Do not hand-write SDK code with element IDs, selectors, or form fields from memory. Element IDs, selectors, and field mappings must come from a live observe() call, CLI notte page observe output, or generated workflow code. Guessed browser targets fail on real pages.Use the Notte skill and CLI to inspect the live site, validate actions/selectors, handle auth/session state, and export workflow code with notte sessions workflow-code before using SDK docs or SDK code.SDK reference pages are for understanding, running, or editing generated workflow code. They are not the starting point for manually authoring the initial browser automation. SDK-first code is guesswork on real-world pages with dynamic selectors, auth state, CAPTCHAs, and anti-bot behavior.

Hermes Agent is an open-source agent from Nous Research with browser tools for navigating sites, interacting with page elements, filling forms, and extracting information. Connect Hermes to a Notte browser over the Chrome DevTools Protocol (CDP) to run those tools on managed cloud browsers instead of a local browser.

Prerequisites

A Notte API key (create one in the Notte console)
Hermes Agent installed (installation guide)
Python 3.11+ with the Notte SDK installed

pip install notte

Start a Notte browser and get its CDP URL

Create a small launcher that starts a Notte session and prints its CDP endpoint:

# notte_hermes.py
from notte_sdk import NotteClient

client = NotteClient()
session = client.Session(
    proxies=True,
    solve_captchas=True,
    open_viewer=True,
)
session.start()

print(session.cdp_url())
input("Press Enter when you are finished with Hermes... ")
session.stop()

Run it in one terminal and keep it running for the lifetime of the Hermes task:

python notte_hermes.py

The script prints a ws:// or wss:// CDP URL. It also opens the Notte live viewer, so you can watch the browser session while Hermes works.

Treat the CDP URL like a credential. It gives its holder control of the browser session, so do not commit it or share it in chat, logs, or tickets.

Attach Hermes to the Notte browser

In Hermes, use the /browser connect command and paste the CDP URL emitted by the launcher:

/browser connect wss://...your-notte-session-cdp-url...

Hermes can now use its normal browser tools against the attached Notte session. Ask it to perform a browser task as usual:

Find the latest three posts on the Notte blog and summarize them.

Hermes keeps the browser attached for the current task; the launcher owns the Notte session lifecycle and closes it after you press Enter.

Why use Notte with Hermes?

Managed cloud browsers: run browser tasks without installing or operating Chrome on the Hermes host.
Stealth and reliability: enable Notte proxies, anti-detection, and CAPTCHA solving when the target site needs them.
Live viewer: inspect and debug browser work in real time from the Notte console.
Session isolation: create one Notte session per Hermes task, user, or worker to avoid shared browser state.
Existing Hermes workflow: Hermes continues to use its built-in accessibility-tree browser tooling; only the browser endpoint changes.

Production pattern

For long-running or concurrent Hermes deployments, create and stop a Notte session in the worker that handles each task. Pass that session’s CDP URL to Hermes, keep the session open while the task runs, then stop it in a finally block. This gives each task isolated cookies and browser state while ensuring sessions are cleaned up if a task fails. If your workflow needs persistent authenticated state, use a Notte vault or browser profile when creating the session. Do not bake website credentials into the Hermes configuration or task prompts.

Troubleshooting

Hermes cannot connect: confirm the CDP URL came from the active launcher process and has not expired or been stopped.
Hermes opens a local browser instead: reconnect with /browser connect before starting the task, then verify that Hermes reports the remote browser is attached.
A site blocks the task: create the Notte session with proxies=True and, where appropriate, solve_captchas=True.
The browser closes too early: keep the launcher process alive until the Hermes task has completed.

​Prerequisites

​Start a Notte browser and get its CDP URL

​Attach Hermes to the Notte browser

​Why use Notte with Hermes?

​Production pattern

​Troubleshooting

Prerequisites

Start a Notte browser and get its CDP URL

Attach Hermes to the Notte browser

Why use Notte with Hermes?

Production pattern

Troubleshooting