Quanta Intellect — Tools for the AI agent era
Vessel Browser
A browser built for AI assistants

Let your AI use the web
while you stay in control

Vessel lets an AI assistant open websites, click buttons, fill forms, remember sessions, and show every step in a real browser you can supervise.

Install Vessel Free See Premium Options View Source

Free open-source core. Premium adds saved sessions, vision, page-change history, credential vaults, and longer agent workflows.

$ npm i @quanta-intellect/vessel-browser
Open Source · MIT
MCP-Native
Linux, Windows & Mac
80+ Agent Tools
60 stars
10K+ NPM downloads
MIT licensed
See It In Action

Watch Vessel complete a real web task

One prompt. Vessel searches Powell’s, chooses books, and adds them to a cart in a visible browser — so you can see exactly what the agent is doing.

2 min 53 sec
powells.com
5 books → cart
Visible and supervisable
What Vessel Helps With

Web tasks your AI can actually finish

Normal browsers are made for people clicking one step at a time. Vessel gives AI assistants a browser workspace where they can read, click, remember, and ask for your help when it matters.

Research and summarize websites

Ask an AI to browse real pages, collect useful information, compare options, and bring back a clean summary instead of dumping tabs on you.

Research

Fill forms and handle repetitive clicking

Let your assistant click through websites, fill fields, extract tables, and complete tedious browser steps while you keep the final say.

Web Tasks

Stay logged in and continue later

Save browser sessions, tabs, cookies, highlights, bookmarks, and checkpoints so your AI does not have to start from scratch every time.

Memory

Watch, approve, undo, or redirect

Vessel is visible by default. See what the agent is doing, pause risky steps, approve sensitive actions, and roll back if something goes sideways.

Control

Monitor pages for changes

Track important pages and let Vessel surface what changed, so your AI can help watch products, docs, dashboards, listings, or research sources.

Monitoring

Teach Vessel custom skills

Create reusable instructions for repeatable web tasks — research flows, shopping routines, site-specific steps, or anything your agent should remember how to do.

Custom Skills

Plug into your own AI setup

Use Vessel with the built-in chat or connect it to an MCP-compatible agent harness. Bring your own model keys, local models, or OpenAI-compatible endpoint.

BYOK + MCP
How It Works

Simple on the surface, technical underneath

The homepage stays plain: Vessel is a browser your AI can use while you supervise. Under the hood, it is a local Chromium runtime with MCP tools, persistent state, page intelligence, custom skills, checkpoints, and approval controls.

AI Assistant / Agent
Your AI asks to use the web
Built-in chat, Hermes, Claude/Codex-style harnesses, or any MCP-compatible agent
Structured browser actions
Navigate, click, type, extract, diff, undo, save sessions, and restore checkpoints
Page understanding
The agent sees clean page context: forms, buttons, tables, overlays, and important text
MCP
Vessel Runtime
MCP server
Receives tool calls from agents, validates them, and routes them safely
Browser Engine
Chromium with persistent state and session management
Agent-friendly layer
Semantic hints, contextual tools, workflow state, page-change snapshots, and undo points
IPC
You
Watch what happens
A visible browser and sidebar show what the agent is doing in real time
Approve risky steps
Pause, approve, deny, or redirect actions before the agent goes too far
Undo and recover
Restore named checkpoints or roll back before the last mutating action
Bring Your Own Keys

Use the AI stack you already trust

Vessel can run as a browser tool for an outside agent, or as a built-in chat assistant. Use OpenAI, Ollama, Mistral, Gemini, OpenRouter, llama.cpp, or any OpenAI-compatible endpoint.

MCP Server Mode

External agent harness controls the browser via Model Context Protocol

Integrated Chat

Built-in sidebar assistant reads the page, uses browser tools, multi-turn history

Anthropic OpenAI Ollama llama.cpp Mistral xAI Google Gemini OpenRouter Custom OAI-Compatible
Vessel Browser hero view
Integrated chat assistant · Supervisor sidebar · View full size
Design Philosophy

For builders who want the details

Vessel still exposes the lower-level agent primitives when you need them: contextual tools, semantic hints, workflow state, macros, and progressive disclosure for complex browser automation.

  • 1

    Contextual Tool Surfacing

    On a login form, the agent only sees login-relevant tools

  • 2

    Semantic Action Hints

    Elements annotated with workflow context and step progress

  • 3

    Flow State Persistence

    Workflow state maintained across page navigations

  • 4

    Composable Macros

    Login, search, checkout — common patterns as single actions

  • 5

    Progressive Disclosure

    Tools revealed by layer — core, navigation, intelligence, diagnostic

core snapshot · click · type
navigation scroll · back · forward
interaction select · hover · submit
intelligence extract · read_page · wait_for
state session · checkpoint · bookmark
diagnostic console · network · inspect
Get Started

Up and running in seconds

Four ways to install. Pick whichever fits your workflow.

Option 1
npm
Install globally via npm on Linux, Windows, or Mac. Nightly releases — just npm update -g to stay current.
$ npm install -g @quanta-intellect/vessel-browser
$ vessel-browser
Option 2
AppImage
Single file, no dependencies. Download and run. Manual updates required.
$ chmod +x Vessel-*.AppImage
$ ./Vessel-*.AppImage
Option 3
Source
Clone and build from source. Full control. For contributors and power users.
$ curl -fsSL https://raw.githubusercontent.com/
  unmodeled-tyler/vessel-browser/
  main/scripts/install.sh | bash
Option 4
Snap Store
Install from the Snap Store. Auto-updates included. Available on any Linux distro with snapd.
Get it from the Snap Store
Pricing

Start free. Upgrade when your AI needs more room to work

The free version is a real browser for AI-assisted web work. Premium adds the tools that make longer, messier, and more private workflows practical.

Free
$0 / forever

Best for trying Vessel, connecting an agent, and handling everyday browser tasks.

Install Free
  • ✓AI can navigate, read pages, click, type, scroll, and use forms
  • ✓Visible browser window with action undo and human supervision
  • ✓Bookmarks, persistent highlights, autofill profiles, custom skills, and browsing history
  • ✓Ad blocking, private browsing, clear browsing data, and domain policies
  • ✓Changed badge for pages Vessel has seen before
  • ✓50 tool calls per conversation turn
  • ✓MIT-licensed open-source core
Premium
From $5.99 / month

Plan options, trials, and billing are shown in app

Best for saved sessions, private accounts, visual pages, page monitoring, and longer agent workflows.

Install, Then Upgrade In App
  • ✓Saved sessions so agents can stay logged in and resume work later
  • ✓Screenshot and vision tools for pages that are hard to read from text alone
  • ✓What Changed timeline with page-change history and timestamps
  • ✓Workflow tracking for multi-step research, shopping, and automation tasks
  • ✓Credential vaults with blind-fill logins, TOTP support, consent dialogs, and audit logs
  • ✓Obsidian capture for turning useful pages into notes and research memory
  • ✓DevTools and table extraction for debugging, structured data, and messy websites
  • ✓Up to 1,000 tool calls per conversation turn for longer tasks
Plain English: Free is enough to see what Vessel is, let an AI use the browser, and teach it custom skills for repeatable tasks. Premium is for the workflows where you want the AI to remember sessions, inspect visual pages, monitor changes, use private accounts safely, and keep working longer.