Eligibility is application logic
An order outside the sample 30-day return window cannot create a return draft. Tool descriptions are instructions; the handler is what enforces this rule.
INDUSTRY PLAYGROUND / CUSTOMER SUPPORT
WebMCP customer support demo.
Look up a sample order, check return eligibility, and draft a request without sending it.
Checking browser support…Browser setup
Customer support playground
FICTIONAL DATA
NORTH / HELP DESK
Resolve the next step.
Look up a sample order, check return eligibility, and draft a request without sending it.
2 resultsShared page state
Order ORD-1042
Delivered 12 days ago · Eligible for returns
ORD-1042Order ORD-1020
Delivered 45 days ago · Return window closed
ORD-1020TOOL INSPECTOR 5 tools
Look up a fictional order and display its items and return eligibility.
LAST RESULT
// Run a tool to inspect its result.
Run tool calls the local handler directly. Native agent calls appear as “Native WebMCP” in the trace.
Execution trace 0 calls
Newest first. Example workflows are deterministic scripts, not LLM conversations.
No calls yet.
WHAT THIS EXAMPLE TEACHES
Return only the needed context
The fixture includes an order ID and items, with no personal address or payment data. A real implementation must authenticate the requester before exposing any order.
COMMON QUESTIONS
Will this send a support request?
No. Drafts and the final demo confirmation remain local to the page.
Can an agent bypass the return window?
The handler rejects ineligible items before updating state. A production service must enforce the same rule on its server.
API references reviewed September 7, 2026. Chrome imperative API ↗