UI Debugger MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 110 installs a week from npm. Last commit 2 Nov 2026.
Autonomous UI debugging MCP server: an agent drives the browser/desktop, reports bugs + UX issues.
What the code does
We read the source, 3 d ago · rules 995398eba69f
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
const child = spawn(bin, args, { stdio: ['ignore', 'ignore', 'pipe'], signal });
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
This code can reach further than it looks
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add ui-debugger-mcp -e 'OPENAI_API_KEY=<OPENAI_API_KEY>' -- npx -y @developerz.ai/ui-debugger-mcp{
"mcpServers": {
"ui-debugger-mcp": {
"command": "npx",
"args": [
"-y",
"@developerz.ai/ui-debugger-mcp"
],
"env": {
"OPENAI_API_KEY": "<OPENAI_API_KEY>"
}
}
}
}[mcp_servers.ui-debugger-mcp]
command = "npx"
args = ["-y", "@developerz.ai/ui-debugger-mcp"]
env = { OPENAI_API_KEY = "<OPENAI_API_KEY>" }{
"mcpServers": {
"ui-debugger-mcp": {
"command": "npx",
"args": [
"-y",
"@developerz.ai/ui-debugger-mcp"
],
"env": {
"OPENAI_API_KEY": "<OPENAI_API_KEY>"
}
}
}
}{
"servers": {
"ui-debugger-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@developerz.ai/ui-debugger-mcp"
],
"env": {
"OPENAI_API_KEY": "<OPENAI_API_KEY>"
}
}
}
}Put your own value in place of
<OPENAI_API_KEY> (API key for the LLM provider (OpenRouter default)).
The author’s registry entry marks it as required.
Optional settings from the registry entry, left out of the block above:
OPENAI_BASE_URL (Base URL for the LLM provider (defaults to OpenRouter)).
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UI Debugger MCP — questions
Answers built from our own checks of this server.