WebMCP Inspector

About

If you're building for the AI-first web, you already know the problem — there's no reliable way to see what WebMCP tools your site is actually exposing, whether they're valid, or how an AI agent would interact with them.

WebMCP Inspector fixes that.

What does this extension do?
WebMCP (Web Model Context Protocol) is the new W3C standard shipping in Chrome 146 that lets AI agents discover and use tools on websites. Think of it as the bridge between your site and every AI assistant, browser agent, or automated workflow that tries to interact with it.

This extension gives you a full developer console for that layer - right inside Chrome.

What you get:
Audit Tab
Run a 15-point compliance check on any page in seconds. It covers HTTPS, llms.txt, robots.txt AI access, /.well-known/webmcp manifest, navigator.modelContext, window.ai availability, declarative attributes, Open Graph, schema.org, and more. Every failed check tells you exactly how to fix it.

Tools Tab
See every WebMCP tool registered on the page — both imperative (JavaScript) and declarative (HTML attributes). Expand any tool to inspect its full JSON schema, fill in parameters, and run it directly from the panel. No copy-pasting, no guesswork.

Monitor Tab
A live event stream that captures every tool registration, invocation, result, and context update as it happens. Click any event to see the full payload. Useful when tools are registered dynamically or you need to trace exactly what fired during a user interaction.

AI Chat Tab
Connect your own Gemini, OpenAI, Anthropic, or local Ollama instance. Ask the AI to explain what tools are available, call a tool on your behalf, or analyse the page's WebMCP readiness — using the actual tools it finds, not a simulation.

Settings Tab
Bring your own API keys. Supports Google Gemini, OpenAI GPT, Anthropic Claude, and Ollama for fully local usage. All keys are stored locally on your machine — nothing leaves your browser except your own API calls.

Export Reports
Export the full inspection report as a JSON file using the Export Full Report as JSON button. This allows developers to save, share, or analyse WebMCP validation results outside the extension.

Who is this for?
- Web developers implementing WebMCP on their sites or apps
- Frontend engineers testing tool registration and invocation flows
- Full-stack teams debugging why an AI agent isn't picking up their tools
- Agencies auditing client sites for AI-agent compatibility
- Anyone building AI-integrated web experiences who needs to see what's actually happening under the hood

How to get started:
1. Enable the WebMCP testing flag at chrome://flags/#enable-webmcp-testing
2. Install the extension and navigate to any page
3. Click the WebMCP Inspector icon in your toolbar
4. Hit Scan — your results are ready in under a second

Built by WebMCPWorld Team — the team behind webmcpworld.com and the WebMCP Validator.