vessel-browser

Overview

Vessel Browser is an open-source chromium-based browser designed specifically for autonomous agents. It provides durable state management, MCP protocol integration, and a visible supervisory UI that keeps humans in the loop during agent operations. The browser features named sessions, pinned tabs, editable bookmarks, checkpoints, and structured page visibility to support long-running agent workflows. It's compatible with agent harnesses like Hermes Agent and OpenClaw.

Try asking AI

After installing, here are 5 things you can ask your AI assistant:

• undo_last_action

  Restore browser to the session snapshot before the last agent action

  Try:Undo the last actionTry:Go back to before the last change
• flow_start

  Begin tracking a named multi-step workflow for visibility

  Try:Start a research workflowTry:Begin a data collection process
• flow_advance

  Mark progress in a tracked workflow

  Try:Mark the research step as completeTry:Advance to the next workflow stage
• extract_content

  Extract page content with structured visibility context

  Try:Get the main article contentTry:Extract product details from this page
• highlight_elements

  Add visual markers to specific page elements

  Try:Highlight the main form fieldsTry:Mark the checkout button
• dismiss_popup

  Explicitly close common popups and consent overlays

  Try:Close the cookie consent popupTry:Dismiss the newsletter signup
• auto_fill_form

  Fill form fields using saved profiles

  Try:Fill in my shipping addressTry:Use my work profile for this form
• navigate_to

  Open a URL in the current browser tab

  Try:Go to https://example.comTry:Navigate to the shopping cart
• create_bookmark

  Save current page with structured agent metadata

  Try:Bookmark this product page for laterTry:Save this research article
• take_screenshot

  Capture full page image for visual analysis

  Try:Screenshot the entire pageTry:Take a picture of this dashboard
• create_checkpoint

  Save browser state with name and notes for recovery

  Try:Checkpoint before checkoutTry:Save state before form submission
• search_bookmarks

  Find bookmarks by title, content, or metadata

  Try:Find articles about AITry:Search for saved product pages

Note: Tools inferred from descriptions throughout the README, as there was no dedicated 'Tools' section. The MCP server functionality is described but without explicit tool names or signatures.

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Installation

{
  "mcpServers": {
    "vessel-browser": {
      "command": "vessel-browser",
      "args": ["--mcp"]
    }
  }
}

FAQ

What is Vessel Browser?

Vessel is a chromium-based browser built specifically for autonomous agents, providing persistent state, MCP control, and a visible supervisory UI for human oversight.

How does Vessel integrate with MCP servers?

Vessel exposes MCP tools that allow external agent harnesses to control the browser, manage sessions, interact with pages, and maintain state across operations.

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