UI Debugger MCP

AI coding agents (Claude, etc.) are great at writing code. They're bad at knowing if the UI actually works. For backend code there are unit and integration tests. For UI, a human still has to open the app, log in, click around, and report what's broken. That human-in-the-loop is slow, boring, and the main bottleneck when an entire product is built by AI.

People who work with browser automation, cdp and openrouter and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-09-17 · ★ 2 · #104 OF 255 MAINTAINED BROWSER AUTOMATION · VERIFIED 2026-09-18

MIT · TypeScript servers · how we verify → /methodology

01 · Install UI Debugger MCP

before you install - you'll need

Set OPENAI_API_KEY, OPENAI_BASE_URL before connecting.

Claude Code

claude mcp add developerz-ai-ui-debugger-mcp -- npx -y @developerz.ai/ui-debugger-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "developerz-ai-ui-debugger-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@developerz.ai/ui-debugger-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

license MIT - declared in the repository

npm package @developerz.ai/ui-debugger-mcp - the @developerz.ai scope differs from the repo owner (developerz-ai); confirm it's the project's official package

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

03 · What UI Debugger MCP can do

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

Latest releases

v1.9.0 · 2026-09-05

Added · The per-repo config is read from .dz/ui-debugger/ui-debugger-mcp.json first, falling back to the root .ui-debugger-mcp.json. A repo that has consolidated its agent config under .dz/ now boots the tool instead…

v1.8.0 · 2026-07-31

[1.8.0] - 2026-07-30 · Changed · A managed android run is headless by default. The adapter used to spawn · emulator @avd -port <p> and nothing else, which opens a window on a desktop · and fails to boot at all on a box…

v1.7.0 · 2026-07-27

[1.7.0] - 2026-07-27 · Two ways a run went wrong before it started: the project was still held by a run · nobody could name any more, or the driver had never been told that this app's · empty tables are the point.…

04 · Who maintains UI Debugger MCP

ui-debugger-mcp is maintained by developerz-ai. It's the only MCP server we track from this author; the repo dates to Jun 2026.

05 · Facts

repository: github.com/developerz-ai/ui-debugger-mcp
website: https://github.com/developerz-ai/ui-debugger-mcp#readme
category: browser automation - ranked #104 of 255 actively-maintained browser automation servers as of 2026-09-18.
release cadence: 10+ releases in the last 90 days (latest 2026-09-05)
registry: io.github.developerz-ai/ui-debugger-mcp (active, first published 2026-07-24 · 10 versions)
packages: npm:@developerz.ai/ui-debugger-mcp

06 · UI Debugger MCP FAQ

What is UI Debugger MCP?

Is UI Debugger MCP still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-17 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

How do I install UI Debugger MCP?

Run `npx -y @developerz.ai/ui-debugger-mcp`. The README documents 2 environment variables (OPENAI_API_KEY, OPENAI_BASE_URL) to set first. Set OPENAI_API_KEY, OPENAI_BASE_URL before connecting. You can also paste the ready-made client config above.

Does UI Debugger MCP run locally?

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

07 · Alternatives to UI Debugger MCP

Alternatives to UI Debugger MCP

Maintained browser automation servers if UI Debugger MCP isn't the fit.

Pairs well with

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

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