SYS.TOOLS
MCP Inspector Online
Free online MCP inspector: connect to any remote MCP server from your browser and test its tools, resources, and prompts. No npx, no install, no sign-up.
WHAT THIS TOOL DOES
Paste the URL of any remote MCP server (Model Context Protocol, the standard that lets AI assistants like Claude and ChatGPT call external tools) and this inspector connects to it, lists everything the server exposes, and lets you call tools with real arguments. It speaks both Streamable HTTP and the older SSE transport, so it works with basically any remote server. Unlike the official MCP Inspector, there is nothing to install: no npx, no Node, no Docker.
I use MCP servers constantly. I built an image generation MCP server and a YouTube analysis MCP server, and debugging them is exactly why this tool exists. If you are new to MCP, my Claude Code guide covers how to wire servers into your setup, and the image-gen-mcp project page shows what a production server looks like.
FREQUENTLY ASKED QUESTIONS
What is an MCP inspector?
An MCP inspector is a debugging tool that connects to a Model Context Protocol server and shows you everything it exposes: tools, resources, and prompts. You can call tools with real arguments and see the raw results, which is how you verify a server actually works before wiring it into Claude, Cursor, or another AI client.
Is this MCP inspector free?
Yes, completely free with no sign-up. You get up to 60 requests per hour, where each connection, tool call, resource read, or prompt fetch counts as one request.
How do I run an MCP inspector without installing anything?
Paste your server's URL into this page and click Connect. The official MCP Inspector requires running npx @modelcontextprotocol/inspector locally with Node installed; this one runs in your browser and works with any publicly reachable Streamable HTTP or SSE server.
What does MCP stand for?
MCP stands for Model Context Protocol, an open standard created by Anthropic that lets AI assistants call external tools, read resources, and use prompts from third-party servers. It is supported by Claude, ChatGPT, Cursor, and most AI coding tools.
Can I inspect MCP servers that require authentication?
Yes, add a bearer token and it is sent as an Authorization header on every request. Interactive OAuth login flows are not supported, and localhost servers can't be reached because the inspector connects from the cloud, so the server must be publicly accessible.
