Eizen
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The Rubin Observatory under the Milky Way

Browser

A browser in every thread, driven by the agent or by you

An agent that can only read code has to guess whether the page looks right. In Eizen it opens the page and checks.

One per thread

Switch threads and the page keeps working

Each thread keeps its own tabs. A thread that is off screen can still load pages, click through them and capture screenshots, so a test in one thread never lands on the page another thread was using. Six stay loaded at a time, and the least recently used one closes first.

Invoice table
On screen
Taking a screenshot of /invoices
Status pills
Off screen
Clicking through the filters
Pre-ship review
Off screen
Reading console errors

Watch it work

A pointer you can follow

As the agent works, a pointer moves across the page, the element it is about to touch gets an outline, and a chip says what it is doing.

InvoicesShipments
http://localhost:4100/
HarborInvoicesShipmentsCarriers
InvoicesNew invoice
INV-20418Northwind Foods$12,840.00late
INV-20431Calder Steel$6,420.50open
INV-20437Ostrava Glass$3,189.00paid
INV-20452Lindqvist Timber$9,774.25open
Claude: clicking New invoiceClaude: reading the first rowClaude: taking a screenshot
1 console error

Two kinds of tab

Real sign-ins for websites and dev tools for localhost

Local pages and websites have different needs, so Eizen opens them differently.

What it isWhat you get
WebsitesA real WebView2 view placed over the panelOAuth, cookies, captchas and logins work as they do in Edge
Local dev pagesA proxied view you can inspectElement picker, tweaks, accessibility checks and error capture
Pages the agent opensA real view at the true addressScreenshots off screen, and a developer view one click away

What the agent can do

It works the page the way you would

A pointer moves across the page as the agent works, with an outline on the element and a chip that says what it is doing.

Open and manage tabs

Goes to a URL, opens more tabs, switches between them.

Read the page

Gets the text and structure of what is showing.

Click, type, press, scroll

Acts on the page the same way a person would.

Take screenshots

Looks at the page, and it works off screen.

Read errors

Console errors and failed requests from the page.

Ask first, if you want

One setting decides whether the agent opens the browser freely or asks.

What you can do

Point at the problem so you can stop describing it

Move over a tool to see it work.

HarborInvoicesShipmentsCarriers
InvoicesNew invoice
INV-20418Northwind Foods$12,840.00late
INV-20431Calder Steel$6,420.50open
INV-20437Ostrava Glass$3,189.00paid
INV-20452Lindqvist Timber$9,774.25open

Sends its selector, markup, source file and a crop to the agent.

HarborInvoicesShipmentsCarriers
InvoicesNew invoice
INV-20418Northwind Foods$12,840.00late
INV-20431Calder Steel$6,420.50open
INV-20437Ostrava Glass$3,189.00paid
INV-20452Lindqvist Timber$9,774.25open

Arrows, boxes and labels, flattened into your message.

New invoice

Drag padding or edit text, then send the exact changes.

1Click New invoice
2Type Calder Steel in Customer
3Press Enter
4TypeError: cents is undefined

Clicks, keys and errors become numbered steps, or a Playwright test.

SeriousStatus pill text contrast is 3.1 to 1
ModerateNew invoice button has no accessible name
MinorTable is missing a caption

Runs axe-core in the page and lists problems by impact.

HarborInvoicesShipmentsCarriers
InvoicesNew invoice
INV-20418Northwind Foods$12,840.00late
INV-20431Calder Steel$6,420.50open
INV-20437Ostrava Glass$3,189.00paid
INV-20452Lindqvist Timber$9,774.25open
HarborInvoicesShipmentsCarriers
InvoicesNew invoice
INV-20418Northwind Foods$12,840.00late
INV-20431Calder Steel$6,420.50open
INV-20437Ostrava Glass$3,189.00paid
INV-20452Lindqvist Timber$9,774.25open

Pin a screenshot and drag a divider against the current page.

Desktop, tablet and phone widths, or capture all three.

Errors

Page errors arrive with your next message

Errors from the page collect in a chip above the composer. Send your message and they go along with it, so the agent starts from the stack trace you were about to paste.

A thread and its browser panel side by side

Open a lane on the repo you were going to work on anyway

The setup checklist handles Claude Code, sign-in and Git, so you won't need a terminal.