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Free Tool

WebMCP Readiness
Checker

35+ checks across 5 categories. Copy-paste fix code for every issue. Side-by-side competitor benchmarking. No signup required.

35 checks vs. 5
Free fix code vs. $49/mo
Real benchmarking vs. generic

How it works

01

Paste any URL

Any public URL — homepage, product page, checkout flow. Optionally add a competitor URL for side-by-side comparison.

02

35+ WebMCP checks run

Declarative API, Imperative API, Form Hygiene, Security, and Discoverability — scored 0–100 with severity levels.

03

Get fix code you can paste

Every issue comes with copy-paste code — the exact HTML attributes and JavaScript to make your site agent-ready.

Why this one

Check depth 35 vs. 5
Whistle
Others
Categories covered 5 vs. 2
Whistle
Others
Fix code generation Free vs. $49/mo
Whistle
Others

Others require a paid plan for fix code. Whistle includes it free.

Competitor benchmarking
Whistle
Others

No other free tool lets you benchmark against a competitor URL.

What gets checked

Declarative API ▾
toolname attributes
tooldescription
toolparamdescription
toolautosubmit
submit buttons
input types
stable name/id
select options
Imperative API ▾
navigator.modelContext
registerTool() calls
tool names & descriptions
inputSchema validation
readOnlyHint
requestUserInteraction
Form Hygiene ▾
input labels
semantic HTML
accessible names
heading hierarchy
ARIA landmarks
Security ▾
no API keys in scripts
no secrets in tool defs
readOnlyHint annotations
user consent flows
HTTPS consistency
Content Security Policy
Discoverability ▾
robots.txt AI crawlers
.well-known/mcp.json
MCP manifest meta tag
JSON-LD structured data
llms.txt reference
social meta tags
Competitor Benchmarking
Copy-Paste Fix Code Generation

FAQ

What is WebMCP? ▾

WebMCP is a W3C web standard that lets websites expose their functionality as structured tools for AI agents. Instead of screen-scraping, agents interact with your site through typed, schema-driven tool contracts. Available in Chrome 146 Canary, expected in stable Chrome H2 2026.

Why should I care about WebMCP readiness? ▾

As AI-mediated browsing grows, sites that are agent-readable will be preferred over those that require scraping. WebMCP readiness is the “responsive design moment for AI” — early adopters compound an advantage as agent traffic increases.

How is this different from other checkers? ▾

35+ WebMCP-specific checks (vs. 5 from alternatives). Free copy-paste fix code (competitors charge $49/mo). Real competitor benchmarking, not generic scores.

Does it check external JavaScript files? ▾

Currently we check inline scripts and HTML attributes. External JS bundles (webpack/vite output) are not analyzed yet — this is a planned enhancement.

Is my data stored? ▾

No. All analysis runs on our servers during the scan and results are streamed directly to your browser. We don’t store URLs, scan results, or any page content.

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Ready to make your site AI-agent ready?

Whistle AI monitors your WebMCP readiness continuously and alerts you when scores drop.

Get early access →