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Waitwhile MCP by usefulapi
io.usefulapi/waitwhile in the official MCP registry.
Endpoint https://waitwhile.usefulapi.io/mcp. Source: github.com/m190/usefulapi-mcp.
The registry describes it as: Read Waitwhile visits, bookings, customers, services and analytics; add, update and cancel visits.
We read its 29 tools on 2026-10-21. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
waitwhile_list_locations waitwhile_get_location waitwhile_list_location_status waitwhile_get_location_status waitwhile_list_visits waitwhile_search_visits waitwhile_get_visit waitwhile_list_booking_slots waitwhile_first_available_slots waitwhile_list_customers waitwhile_search_customers waitwhile_get_customer waitwhile_list_customer_notes waitwhile_list_services waitwhile_get_service waitwhile_list_resources waitwhile_get_resource waitwhile_resources_availability waitwhile_list_data_fields waitwhile_get_data_field waitwhile_list_users waitwhile_list_messages waitwhile_get_message waitwhile_visit_analytics waitwhile_list_audit_entries waitwhile_create_visit waitwhile_update_visit waitwhile_cancel_visit waitwhile_add_customer_note
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-usefulapi-waitwhile)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.