Jev Ultrafast MCP

Hand browser work off to a server-side agent: read the page as a table, act, then verify. Its README documents 10 tools, including browser_open, browser_observe, browser_act. It runs locally over stdio via the published package.

People who work with browser automation, chrome devtools protocol and agent tools and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-23 · ★ 19 · #65 OF 290 MAINTAINED BROWSER AUTOMATION · VERIFIED 2026-09-30

MIT · Python servers · how we verify → /methodology

01 · Install Jev Ultrafast MCP

before you install - you'll need

JEVMCP_HEADLESS

Environment variables documented in the project's README - it lists which are required and which have defaults.

Claude Code

claude mcp add jiawei686-jev-ultrafast-mcp -- uvx jev-ultrafast-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "jiawei686-jev-ultrafast-mcp": {
      "command": "uvx",
      "args": [
        "jev-ultrafast-mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

repo age created 2026-09-19 - young repo, little track record yet

license MIT - declared in the repository

pypi package jev-ultrafast-mcp - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.jiawei686 is GitHub-verified and matches the repo owner

03 · What Jev Ultrafast MCP can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

With this server connected, an agent can open a URL in its own tab, and return the element table, list, open, switch and close tabs, and list the live browser sessions.

The 10 tools it gives your agent

Extracted from the project's README - what jev-ultrafast-mcp lets an agent do.

browser_open: - Open a URL in its own tab, and return the element table
browser_observe: - Re-read the page: a delta, or the full table on demand
browser_act: - Run a list of ops in one round trip, then return a delta
browser_assert: - Deterministic checks on the page, with no model judgement
browser_macro: - Record a flow once, then replay it with zero model calls
browser_goal: - Hand the whole task over: the decision model drives the page
browser_tabs: - List, open, switch and close tabs
browser_sessions: - List the live browser sessions
browser_close: - Tear a session down
browser_doctor: - Self-check: which browser was found, and whether it answers

Latest releases

v0.1.5 · 2026-09-20

0.1.5 - the release the registry would accept · The release that makes the registry entry submittable. 0.1.4 could not be: the registry proves · ownership of a PyPI package by finding a marker line in the package's…

04 · Who maintains Jev Ultrafast MCP

jev-ultrafast-mcp is maintained by jiawei686. It's the only MCP server we track from this author; the repo dates to Sep 2026.

05 · Facts

repository: github.com/jiawei686/jev-ultrafast-mcp
website: https://github.com/jiawei686/jev-ultrafast-mcp
category: browser automation - ranked #65 of 290 actively-maintained browser automation servers as of 2026-09-30.
release cadence: 1 release in the last 90 days (latest 2026-09-20)
registry: io.github.jiawei686/jev-ultrafast-mcp (active, first published 2026-09-19)
packages: pypi:jev-ultrafast-mcp

06 · Jev Ultrafast MCP FAQ

Is Jev Ultrafast MCP still maintained?

Yes - as of 2026-09-30, its last commit was 2026-09-23 and it shipped 1 release in the last 90 days. We re-verify nightly.

What can Jev Ultrafast MCP do?

With this server connected, an agent can open a URL in its own tab, and return the element table, list, open, switch and close tabs, and list the live browser sessions.

How do I install Jev Ultrafast MCP?

Run `uvx jev-ultrafast-mcp`. The README documents one environment variable (JEVMCP_HEADLESS) to set first. You can also paste the ready-made client config above.

Does Jev Ultrafast MCP run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Jev Ultrafast MCP

Alternatives to Jev Ultrafast MCP

Maintained browser automation servers if Jev Ultrafast MCP isn't the fit.

Pairs well with

Servers that cover what Jev Ultrafast MCP doesn't - only shown when the pairing reason fits the companion.

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