hermes-agent/website/docs/user-guide/features/browser.md

title	description	sidebar_label	sidebar_position
Browser Automation	Control browsers with multiple providers, local Chrome via CDP, or cloud browsers for web interaction, form filling, scraping, and more.	Browser	5

Browser Automation

Hermes Agent includes a full browser automation toolset with multiple backend options:

• Browserbase cloud mode via Browserbase for managed cloud browsers and anti-bot tooling
• Browser Use cloud mode via Browser Use as an alternative cloud browser provider
• Firecrawl cloud mode via Firecrawl for cloud browsers with built-in scraping
• Camofox local mode via Camofox for local anti-detection browsing (Firefox-based fingerprint spoofing)
• Local Chrome via CDP — connect browser tools to your own Chrome instance using /browser connect
• Local browser mode via the agent-browser CLI and a local Chromium installation

In all modes, the agent can navigate websites, interact with page elements, fill forms, and extract information.

Overview

Pages are represented as accessibility trees (text-based snapshots), making them ideal for LLM agents. Interactive elements get ref IDs (like @e1, @e2) that the agent uses for clicking and typing.

Key capabilities:

• Multi-provider cloud execution — Browserbase, Browser Use, or Firecrawl — no local browser needed
• Local Chrome integration — attach to your running Chrome via CDP for hands-on browsing
• Built-in stealth — random fingerprints, CAPTCHA solving, residential proxies (Browserbase)
• Session isolation — each task gets its own browser session
• Automatic cleanup — inactive sessions are closed after a timeout
• Vision analysis — screenshot + AI analysis for visual understanding

Setup

:::tip Nous Subscribers If you have a paid Nous Portal subscription, you can use browser automation through the Tool Gateway without any separate API keys. Run hermes model or hermes tools to enable it. :::

Browserbase cloud mode

To use Browserbase-managed cloud browsers, add:

# Add to ~/.hermes/.env
BROWSERBASE_API_KEY=***
BROWSERBASE_PROJECT_ID=your-project-id-here

Get your credentials at browserbase.com.

Browser Use cloud mode

To use Browser Use as your cloud browser provider, add:

# Add to ~/.hermes/.env
BROWSER_USE_API_KEY=***

Get your API key at browser-use.com. Browser Use provides a cloud browser via its REST API. If both Browserbase and Browser Use credentials are set, Browserbase takes priority.

Firecrawl cloud mode

To use Firecrawl as your cloud browser provider, add:

# Add to ~/.hermes/.env
FIRECRAWL_API_KEY=fc-***

Get your API key at firecrawl.dev. Then select Firecrawl as your browser provider:

hermes setup tools
# → Browser Automation → Firecrawl

Optional settings:

# Self-hosted Firecrawl instance (default: https://api.firecrawl.dev)
FIRECRAWL_API_URL=http://localhost:3002

# Session TTL in seconds (default: 300)
FIRECRAWL_BROWSER_TTL=600

Camofox local mode

Camofox is a self-hosted Node.js server wrapping Camoufox (a Firefox fork with C++ fingerprint spoofing). It provides local anti-detection browsing without cloud dependencies.

# Install and run
git clone https://github.com/jo-inc/camofox-browser && cd camofox-browser
npm install && npm start   # downloads Camoufox (~300MB) on first run

# Or via Docker
docker run -d --network host -e CAMOFOX_PORT=9377 jo-inc/camofox-browser

Then set in ~/.hermes/.env:

CAMOFOX_URL=http://localhost:9377

Or configure via hermes tools → Browser Automation → Camofox.

When CAMOFOX_URL is set, all browser tools automatically route through Camofox instead of Browserbase or agent-browser.

Persistent browser sessions

By default, each Camofox session gets a random identity — cookies and logins don't survive across agent restarts. To enable persistent browser sessions, add the following to ~/.hermes/config.yaml:

browser:
  camofox:
    managed_persistence: true

Then fully restart Hermes so the new config is picked up.

:::warning Nested path matters Hermes reads browser.camofox.managed_persistence, not a top-level managed_persistence. A common mistake is writing:

# ❌ Wrong — Hermes ignores this
managed_persistence: true

If the flag is placed at the wrong path, Hermes silently falls back to a random ephemeral userId and your login state will be lost on every session. :::

What Hermes does

• Sends a deterministic profile-scoped userId to Camofox so the server can reuse the same Firefox profile across sessions.
• Skips server-side context destruction on cleanup, so cookies and logins survive between agent tasks.
• Scopes the userId to the active Hermes profile, so different Hermes profiles get different browser profiles (profile isolation).

What Hermes does not do

• It does not force persistence on the Camofox server. Hermes only sends a stable userId; the server must honor it by mapping that userId to a persistent Firefox profile directory.
• If your Camofox server build treats every request as ephemeral (e.g. always calls browser.newContext() without loading a stored profile), Hermes cannot make those sessions persist. Make sure you are running a Camofox build that implements userId-based profile persistence.

Verify it's working

1. Start Hermes and your Camofox server.
2. Open Google (or any login site) in a browser task and sign in manually.
3. End the browser task normally.
4. Start a new browser task.
5. Open the same site again — you should still be signed in.

If step 5 logs you out, the Camofox server isn't honoring the stable userId. Double-check your config path, confirm you fully restarted Hermes after editing config.yaml, and verify your Camofox server version supports persistent per-user profiles.

Where state lives

Hermes derives the stable userId from the profile-scoped directory ~/.hermes/browser_auth/camofox/ (or the equivalent under $HERMES_HOME for non-default profiles). The actual browser profile data lives on the Camofox server side, keyed by that userId. To fully reset a persistent profile, clear it on the Camofox server and remove the corresponding Hermes profile's state directory.

VNC live view

When Camofox runs in headed mode (with a visible browser window), it exposes a VNC port in its health check response. Hermes automatically discovers this and includes the VNC URL in navigation responses, so the agent can share a link for you to watch the browser live.

Local Chrome via CDP (/browser connect)

Instead of a cloud provider, you can attach Hermes browser tools to your own running Chrome instance via the Chrome DevTools Protocol (CDP). This is useful when you want to see what the agent is doing in real-time, interact with pages that require your own cookies/sessions, or avoid cloud browser costs.

:::note /browser connect is an interactive-CLI slash command — it is not dispatched by the gateway. If you try to run it inside a WebUI, Telegram, Discord, or other gateway chat, the message will be sent to the agent as plain text and the command will not execute. Start Hermes from the terminal (hermes or hermes chat) and issue /browser connect there. :::

In the CLI, use:

/browser connect              # Connect to Chrome at ws://localhost:9222
/browser connect ws://host:port  # Connect to a specific CDP endpoint
/browser status               # Check current connection
/browser disconnect            # Detach and return to cloud/local mode

If Chrome isn't already running with remote debugging, Hermes will attempt to auto-launch it with --remote-debugging-port=9222.

:::tip To start Chrome manually with CDP enabled, use a dedicated user-data-dir so the debug port actually comes up even if Chrome is already running with your normal profile:

# Linux
google-chrome \
  --remote-debugging-port=9222 \
  --user-data-dir=$HOME/.hermes/chrome-debug \
  --no-first-run \
  --no-default-browser-check &

# macOS
"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome" \
  --remote-debugging-port=9222 \
  --user-data-dir="$HOME/.hermes/chrome-debug" \
  --no-first-run \
  --no-default-browser-check &

Then launch the Hermes CLI and run /browser connect.

Why --user-data-dir? Without it, launching Chrome while a regular Chrome instance is already running typically opens a new window on the existing process — and that existing process was not started with --remote-debugging-port, so port 9222 never opens. A dedicated user-data-dir forces a fresh Chrome process where the debug port actually listens. --no-first-run --no-default-browser-check skips the first-launch wizard for the fresh profile. :::

When connected via CDP, all browser tools (browser_navigate, browser_click, etc.) operate on your live Chrome instance instead of spinning up a cloud session.

Local browser mode

If you do not set any cloud credentials and don't use /browser connect, Hermes can still use the browser tools through a local Chromium install driven by agent-browser.

Optional Environment Variables

# Residential proxies for better CAPTCHA solving (default: "true")
BROWSERBASE_PROXIES=true

# Advanced stealth with custom Chromium — requires Scale Plan (default: "false")
BROWSERBASE_ADVANCED_STEALTH=false

# Session reconnection after disconnects — requires paid plan (default: "true")
BROWSERBASE_KEEP_ALIVE=true

# Custom session timeout in milliseconds (default: project default)
# Examples: 600000 (10min), 1800000 (30min)
BROWSERBASE_SESSION_TIMEOUT=600000

# Inactivity timeout before auto-cleanup in seconds (default: 120)
BROWSER_INACTIVITY_TIMEOUT=120

Install agent-browser CLI

npm install -g agent-browser
# Or install locally in the repo:
npm install

:::info The browser toolset must be included in your config's toolsets list or enabled via hermes config set toolsets '["hermes-cli", "browser"]'. :::

Available Tools

browser_navigate

Navigate to a URL. Must be called before any other browser tool. Initializes the Browserbase session.

Navigate to https://github.com/NousResearch

:::tip For simple information retrieval, prefer web_search or web_extract — they are faster and cheaper. Use browser tools when you need to interact with a page (click buttons, fill forms, handle dynamic content). :::

browser_snapshot

Get a text-based snapshot of the current page's accessibility tree. Returns interactive elements with ref IDs like @e1, @e2 for use with browser_click and browser_type.

• full=false (default): Compact view showing only interactive elements
• full=true: Complete page content

Snapshots over 8000 characters are automatically summarized by an LLM.

browser_click

Click an element identified by its ref ID from the snapshot.

Click @e5 to press the "Sign In" button

browser_type

Type text into an input field. Clears the field first, then types the new text.

Type "hermes agent" into the search field @e3

browser_scroll

Scroll the page up or down to reveal more content.

Scroll down to see more results

browser_press

Press a keyboard key. Useful for submitting forms or navigation.

Press Enter to submit the form

Supported keys: Enter, Tab, Escape, ArrowDown, ArrowUp, and more.

browser_back

Navigate back to the previous page in browser history.

browser_get_images

List all images on the current page with their URLs and alt text. Useful for finding images to analyze.

browser_vision

Take a screenshot and analyze it with vision AI. Use this when text snapshots don't capture important visual information — especially useful for CAPTCHAs, complex layouts, or visual verification challenges.

The screenshot is saved persistently and the file path is returned alongside the AI analysis. On messaging platforms (Telegram, Discord, Slack, WhatsApp), you can ask the agent to share the screenshot — it will be sent as a native photo attachment via the MEDIA: mechanism.

What does the chart on this page show?

Screenshots are stored in ~/.hermes/cache/screenshots/ and automatically cleaned up after 24 hours.

browser_console

Get browser console output (log/warn/error messages) and uncaught JavaScript exceptions from the current page. Essential for detecting silent JS errors that don't appear in the accessibility tree.

Check the browser console for any JavaScript errors

Use clear=True to clear the console after reading, so subsequent calls only show new messages.

browser_cdp

Raw Chrome DevTools Protocol passthrough — the escape hatch for browser operations not covered by the other tools. Use for native dialog handling, iframe-scoped evaluation, cookie/network control, or any CDP verb the agent needs.

Only available when a CDP endpoint is reachable at session start — meaning /browser connect has attached to a running Chrome, or browser.cdp_url is set in config.yaml. The default local agent-browser mode, Camofox, and cloud providers (Browserbase, Browser Use, Firecrawl) do not currently expose CDP to this tool — cloud providers have per-session CDP URLs but live-session routing is a follow-up.

CDP method reference: https://chromedevtools.github.io/devtools-protocol/ — the agent can web_extract a specific method's page to look up parameters and return shape.

Common patterns:

# List tabs (browser-level, no target_id)
browser_cdp(method="Target.getTargets")

# Handle a native JS dialog on a tab
browser_cdp(method="Page.handleJavaScriptDialog",
            params={"accept": true, "promptText": ""},
            target_id="<tabId>")

# Evaluate JS in a specific tab
browser_cdp(method="Runtime.evaluate",
            params={"expression": "document.title", "returnByValue": true},
            target_id="<tabId>")

# Get all cookies
browser_cdp(method="Network.getAllCookies")

Browser-level methods (Target.*, Browser.*, Storage.*) omit target_id. Page-level methods (Page.*, Runtime.*, DOM.*, Emulation.*) require a target_id from Target.getTargets. Each stateless call is independent — sessions do not persist between calls.

Cross-origin iframes: pass frame_id (from browser_snapshot.frame_tree.children[] where is_oopif=true) to route the CDP call through the supervisor's live session for that iframe. This is how Runtime.evaluate inside a cross-origin iframe works on Browserbase, where stateless CDP connections would hit signed-URL expiry. Example:

browser_cdp(
  method="Runtime.evaluate",
  params={"expression": "document.title", "returnByValue": True},
  frame_id="<frame_id from browser_snapshot>",
)

Same-origin iframes don't need frame_id — use document.querySelector('iframe').contentDocument from a top-level Runtime.evaluate instead.

browser_dialog

Responds to a native JS dialog (alert / confirm / prompt / beforeunload). Before this tool existed, dialogs would silently block the page's JavaScript thread and subsequent browser_* calls would hang or throw; now the agent sees pending dialogs in browser_snapshot output and responds explicitly.

Workflow:

1. Call browser_snapshot. If a dialog is blocking the page, it shows up as pending_dialogs: [{"id": "d-1", "type": "alert", "message": "..."}].
2. Call browser_dialog(action="accept") or browser_dialog(action="dismiss"). For prompt() dialogs, pass prompt_text="..." to supply the response.
3. Re-snapshot — pending_dialogs is empty; the page's JS thread has resumed.

Detection happens automatically via a persistent CDP supervisor — one WebSocket per task that subscribes to Page/Runtime/Target events. The supervisor also populates a frame_tree field in the snapshot so the agent can see the iframe structure of the current page, including cross-origin (OOPIF) iframes.

Availability matrix:

Backend	Detection via pending_dialogs	Response (browser_dialog tool)
Local Chrome via /browser connect or browser.cdp_url	✓	✓ full workflow
Browserbase	✓	✓ full workflow (via injected XHR bridge)
Camofox / default local agent-browser	✗	✗ (no CDP endpoint)

How it works on Browserbase. Browserbase's CDP proxy auto-dismisses real native dialogs server-side within ~10ms, so we can't use Page.handleJavaScriptDialog. The supervisor injects a small script via Page.addScriptToEvaluateOnNewDocument that overrides window.alert/confirm/prompt with a synchronous XHR. We intercept those XHRs via Fetch.enable — the page's JS thread stays blocked on the XHR until we call Fetch.fulfillRequest with the agent's response. prompt() return values round-trip back into page JS unchanged.

Dialog policy is configured in config.yaml under browser.dialog_policy:

Policy	Behavior
must_respond (default)	Capture, surface in snapshot, wait for explicit browser_dialog() call. Safety auto-dismiss after browser.dialog_timeout_s (default 300s) so a buggy agent can't stall forever.
auto_dismiss	Capture, dismiss immediately. Agent still sees the dialog in browser_state history but doesn't have to act.
auto_accept	Capture, accept immediately. Useful when navigating pages with aggressive beforeunload prompts.

Frame tree inside browser_snapshot.frame_tree is capped to 30 frames and OOPIF depth 2 to keep payloads bounded on ad-heavy pages. A truncated: true flag surfaces when limits were hit; agents needing the full tree can use browser_cdp with Page.getFrameTree.

Practical Examples

Filling Out a Web Form

User: Sign up for an account on example.com with my email john@example.com

Agent workflow:
1. browser_navigate("https://example.com/signup")
2. browser_snapshot()  → sees form fields with refs
3. browser_type(ref="@e3", text="john@example.com")
4. browser_type(ref="@e5", text="SecurePass123")
5. browser_click(ref="@e8")  → clicks "Create Account"
6. browser_snapshot()  → confirms success

Researching Dynamic Content

User: What are the top trending repos on GitHub right now?

Agent workflow:
1. browser_navigate("https://github.com/trending")
2. browser_snapshot(full=true)  → reads trending repo list
3. Returns formatted results

Session Recording

Automatically record browser sessions as WebM video files:

browser:
  record_sessions: true  # default: false

When enabled, recording starts automatically on the first browser_navigate and saves to ~/.hermes/browser_recordings/ when the session closes. Works in both local and cloud (Browserbase) modes. Recordings older than 72 hours are automatically cleaned up.

Stealth Features

Browserbase provides automatic stealth capabilities:

Feature	Default	Notes
Basic Stealth	Always on	Random fingerprints, viewport randomization, CAPTCHA solving
Residential Proxies	On	Routes through residential IPs for better access
Advanced Stealth	Off	Custom Chromium build, requires Scale Plan
Keep Alive	On	Session reconnection after network hiccups

:::note If paid features aren't available on your plan, Hermes automatically falls back — first disabling keepAlive, then proxies — so browsing still works on free plans. :::

Session Management

• Each task gets an isolated browser session via Browserbase
• Sessions are automatically cleaned up after inactivity (default: 2 minutes)
• A background thread checks every 30 seconds for stale sessions
• Emergency cleanup runs on process exit to prevent orphaned sessions
• Sessions are released via the Browserbase API (REQUEST_RELEASE status)

Limitations

• Text-based interaction — relies on accessibility tree, not pixel coordinates
• Snapshot size — large pages may be truncated or LLM-summarized at 8000 characters
• Session timeout — cloud sessions expire based on your provider's plan settings
• Cost — cloud sessions consume provider credits; sessions are automatically cleaned up when the conversation ends or after inactivity. Use /browser connect for free local browsing.
• No file downloads — cannot download files from the browser