Does Public Browser require an API key?

No. The MCP server and its CLI work without credentials; only the optional Jev example loop needs a Jev key or gateway access.

Can Jev drive the browser without an LLM?

Yes. The Node library and Python script APIs run the same tool handlers as the MCP server, so a Jev loop can call view_page and click directly; the README example uses a text model only to write literal form values.

How do I install Public Browser in Claude Code?

Run `claude mcp add --scope user public-browser -- npx -y public-browser@latest`, then fully quit and reopen Claude Code; `/mcp reconnect` is not enough because Claude Code reads the mcpServers config only at session start. The first tool call auto-launches Chrome visibly.

What runtime does Public Browser need?

Node.js 20 or newer, and Chrome. It talks to Chrome directly over the DevTools Protocol, with no Playwright dependency, no extension bridge and no shell command per step, and it is distributed on npm as `public-browser`.

How do I use one of my own Chrome profiles?

List profiles with `npx public-browser profiles`, then launch with the `--profile` flag, the `PUBLIC_BROWSER_PROFILE` environment variable, or the `configure_session({ profile })` MCP tool called before any browser interaction. Bookmarks, history, extensions and Chrome's own Google sign-in carry over, but on macOS current Chrome does not load the profile's site cookies through the wrapper.

Does it expose a debugging port on my machine?

Not for a real Chrome profile: it is driven over `--remote-debugging-pipe`, so nothing listens on a TCP port and other programs cannot take over the browser. The flip side is that `--attach` and the Script API's `page.cdp` escape hatch do not work with a real profile.

Is there a way to drive it without an LLM?

Yes. A Node library (`createSession()`) and a Python client (`pip install publicbrowser`) expose the same tool handlers as the MCP server, which the README frames as a fit for decision models like Jev. Adding `--script` to the MCP args enables the parallel Python Script API.

CommunityJev Agents & MCP

Public Browser

MCP server that lets Claude Code, Cursor and other clients drive Chrome over the DevTools Protocol, exposing an accessibility-tree menu of stable refs. Its example Jev loop has Jev pick browser actions from that menu, and the README reports about a third fewer tokens and a quarter fewer tool calls in a blind benchmark.

See highlights

Open github.com

Stars: 18
Language: TypeScript
License: MIT
Published by: Community
Last verified: Oct 2026

Silbercue/public-browser

User repository on GitHub

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Lets Claude Code and Cursor drive Chrome. Blind benchmark vs agent-browser: -33% tokens, -33% cost, -24% tool calls, +48% speed, 30/30. Direct CDP, a11y-tree refs, server-side plan executor. MIT, no paid tier.

Forks: 0
Last pushed: Updated Sep 2026

Repo stats from the GitHub API, cached Oct 2026.Homepage

About this project

Lets Claude Code, Cursor and any MCP client drive Chrome. In a blind benchmark on a 30-test page, five runs each, Public Browser 3.0 passed 30/30 in every run and used a median of 3.0M session tokens where agent-browser 0.38.1 used 4.5M — a third fewer tokens, a third less cost, a quarter fewer tool calls and 48% faster (261 s against 386 s) (Benchmarks, including where it loses). Measured 2026-09-23/24 with Claude Code 2.1.281, driver Claude Opus 5 and Chrome 153; agent-browser ran through its CLI with its…

Quoted from the project's README. Read the full README.

Tagscommunity mcp browser-automation typescript

Works forJev for Tool calling Jev for Verification

Used inJev for Software & DevTools

Languages: TypeScript
Platforms: MCP Browser
Capabilities: Open sourceRuns locally

Highlights

Installs via npx -y public-browser@latest; requires Node 20 or later.
README benchmark: 30/30 tests, 3.02M vs 4.53M session tokens, 79 vs 104 tool calls, 261 s vs 386 s.
examples/jev-loop.mjs drives six benchmark cards through Jev choice decisions: 6/6 twice, 23 and 21 Jev calls.
Uses direct CDP with no Playwright dependency; ships 2,700+ TypeScript and 280+ Python tests.

Watch out

MIT licensed. The benchmark compares one vendor scenario on the author's own 30-test page, and profile mode does not carry site logins on macOS.

Questions about this entry

Short answers drawn from the linked project or page.

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Hacker News: Show HN: Agent Chaperone screens tool calls and results with Jev before the agent sees them.

sepehrsafari5 pointsShow HN: Agent Chaperone – Screen AI agent tool calls and results with JevRead the thread on Hacker News

X: jev-review: a local-first score loop for coding agents

Reddit: One command to wire Jev into Claude Code, Claude Desktop, and Codex.

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