UCP Checker & Agent Debugger

Tracking since Apr 17, 2026.

Changelog

• Apr 17, 2026
  description

  See Agent Readiness in Seconds
  
  - Instant manifest detection – Automatically probes /.well-known/ucp on every storefront you visit, showing HTTP status, response time, version metadata, and a quick link to the canonical report on ucpchecker.com.
  
  - Robots & firewall visibility – Instantly see whether GPTBot, Gemini, Claude, Apple Intelligence, or CommonCrawl can reach the store. Any firewall blocks or robots.txt disallows appear right in the badge.
  
  - Zero-click workflow – Green dot = UCP ready. Gray dot = not detected. The popup lets you open the public status page or rerun a live check without leaving the tab.
  
  - Passive data engine – The “Share anonymous uptime stats” toggle (on by default, clearly labeled “Public data only”) crowdsources fresh manifests so the global directory stays current while respecting privacy.
  
  - Developer-friendly defaults – Path-scoped host permissions look only at UCP manifests. No cookies, browsing history, or incognito tabs are touched.
  
  Why install it?
  
  - Shopify/BigCommerce/Magento agencies: verify every storefront before opening DevTools.
  
  - AI platform teams: confirm partner stores expose MCP endpoints and compliant robots policies.
  
  - Growth & BD teams: spot agent-ready brands quickly, then send them their public status report.
  
  Permissions rationale
  
  The extension requests storage, webNavigation, and activeTab, plus host access to https://*/.well-known/ucp*. That scoped host permission is the only path we fetch; no other page content or user data is read. Clicking “View Status” simply opens the public report on ucpchecker.com.
  
  Privacy
  
  - Only public manifest JSON is transmitted, and only when “Share anonymous uptime stats” remains enabled.
  
  - Requests use credentials: "omit" so session cookies or tokens never leave the browser.
  
  - Badge state and timestamps live solely in chrome.storage.local for the popup view.
  
  Support
  
  Need help? Reach out at https://ucpchecker.com/contact and we’ll respond quickly.

  Detect UCP manifests on any store. See capabilities, payments, transports, and spec version — then test with the UCP Playground.                                                                                        
                                                
  Full description:                                                                                           
                                                              
  See what any store supports — instantly.                                                                    
                                            
  UCP Checker detects Universal Commerce Protocol manifests on every storefront you visit. When a manifest is found, the popup shows exactly what the store declares: capabilities (checkout, fulfillment, discount, order), payment handlers (Google Pay, Shopify Card), transport protocols (MCP, Embedded, REST), and the spec version in use.                                                                                            
                                                              
  What you see in the popup:                                                                                  
                                                              
  - Domain status — green dot for UCP ready, grey for not detected
  - Spec version and transport protocols  
  - Capability pills — which commerce features the store supports
  - Payment handler pills — which payment methods are configured                                              
  - One-click links to View Status, Run Check, and Open Playground
                                                                                                                
  Actions from the popup:                                   
                                                                                                                
  - View Status — open the full report on ucpchecker.com                                                      
  - Run Check — trigger a fresh live validation                                                               
  - Open Playground — launch a live AI agent session against the store on ucpplayground.com                   
                                                                                                                
  Who it's for:                               
                                                                                                                
  - E-commerce agencies: verify UCP compliance on client stores without opening DevTools                      
  - AI platform teams: confirm MCP endpoints and capabilities before integration                              
  - Growth & BD teams: identify agent-ready brands and share their public status report                       
  - Developers: check spec version, transports, and capabilities while browsing                               
                                                              
  Privacy & permissions:                                                                                      
                                                              
  - Path-scoped host permissions — only fetches /.well-known/ucp manifest files                               
  - No cookies, browsing history, or page content is read   
  - "Share anonymous uptime stats" toggle crowdsources public manifest data to keep the global directory current. Only public JSON is transmitted with credentials: "omit"                                           
  - All state stored locally in chrome.storage.local
                                                                                                                
  Support: https://ucpchecker.com/contact

Permissions & access

Permissions

storageactiveTabwebNavigation

Host access

https://*/.well-known/ucp*, https://*/.well-known/ucp-manifest*

Screenshots

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