Question 1

Where does the claim of 27 to 198 times cheaper come from?

Accepted Answer

From the repository's own benchmark script, which runs three live tasks, searching Wikipedia and opening an article, filling seven fields of a test order form without submitting, and opening the comments on a Hacker News story, through the same loop and page element list, changing only who answers each step's questions. A session mode makes the comparison models run the way Claude Code and Codex actually run them.

Question 2

Can it really buy something, and what stops it?

Accepted Answer

Not without you. Clicks that buy, pay, send, post or delete stop and wait for confirmation, as does a Comment, Reply or Send button sitting next to a text box holding text, because it would publish what was typed. DONE only counts when an independent goal check agrees, and three actions without a visible change end the run. For fully automatic runs you can switch confirmation off with JBC_CONFIRM_IRREVERSIBLE=0.

Question 3

Do I have to pay them, and what leaves my machine?

Accepted Answer

Your choice of who pays for the Jev calls: your own OpenRouter key, prepaid credits from the site at roughly five times OpenRouter's price, or any compatible endpoint such as TypeSafe direct. What is sent is a numbered list of visible buttons, links and fields with roles, labels, values and nearby card text; password and file fields are never listed. Per-task costs in their examples run from fractions of a cent to a few cents.

Question 4

Is there an extension, or does it only drive its own browser?

Accepted Answer

Both. By default the server opens its own Chrome window through Playwright with a separate profile that keeps logins, so nothing touches your everyday tabs. Extension mode loads the extension folder unpacked and drives your normal Chrome with your profile and open tabs, using trusted input. That extension also carries a relay for cloud apps that cannot start a local process, which is off by default.

Question 5

How many tools does the browser control MCP server expose?

Accepted Answer

21, including browser_navigate, browser_click, browser_type, browser_read, browser_screenshot, browser_record, and browser_tabs, plus jev_task, jev_find, and jev_check.

Question 6

What happens at a browser control stop gate?

Accepted Answer

Clicks that buy, pay, send, post, or delete stop for confirmation, as does a Comment, Reply, or Send button next to a text box holding text. For fully automatic runs, JBC_CONFIRM_IRREVERSIBLE=0 turns that off.

Question 7

What does Jev return for each browser step?

Accepted Answer

An element number that code maps back to a node it tagged itself; the answer never becomes a selector, coordinates, or code. Jev is asked for the operation, the best target of every operation, and whether the goal is already met.

Jev Browser Control

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