Home / MCP registry index / io.usefulapi/lightspeed-r-series
Lightspeed Retail (R-Series) MCP by usefulapi
io.usefulapi/lightspeed-r-series in the official MCP registry.
Endpoint https://lightspeed-r-series.usefulapi.io/mcp. Source: github.com/m190/usefulapi-mcp.
The registry describes it as: Read Lightspeed R-Series items, stock, sales, customers and POs; create customers and set stock.
We read its 17 tools on 2026-10-26. 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
lightspeedrseries_get_account lightspeedrseries_list_shops lightspeedrseries_list_items lightspeedrseries_get_item lightspeedrseries_list_inventory lightspeedrseries_list_categories lightspeedrseries_list_sales lightspeedrseries_get_sale lightspeedrseries_list_customers lightspeedrseries_get_customer lightspeedrseries_list_vendors lightspeedrseries_list_purchase_orders lightspeedrseries_get_purchase_order lightspeedrseries_list_employees lightspeedrseries_create_customer lightspeedrseries_update_item lightspeedrseries_update_stock
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-usefulapi-lightspeed-r-series)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.
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