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Jackrabbit Class MCP by usefulapi

io.usefulapi/jackrabbit-class in the official MCP registry. Endpoint https://jackrabbit-class.usefulapi.io/mcp. Source: github.com/m190/usefulapi-mcp.

The registry describes it as: Read Jackrabbit Class beta data, create students and add class waitlist entries.

We read its 24 tools on 2026-11-01. 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.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

Claude Code

claude mcp add --transport http jackrabbit-class https://jackrabbit-class.usefulapi.io/mcp

Cursor: ~/.cursor/mcp.json

{
  "mcpServers": {
    "jackrabbit-class": {
      "url": "https://jackrabbit-class.usefulapi.io/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"jackrabbit-class","type":"http","url":"https://jackrabbit-class.usefulapi.io/mcp"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which.

Let Claude Code check servers as it adds them

With the free lazaretto-guard plugin installed, when Claude Code adds a server for you or writes one into an MCP config, the plugin reads the server's tools first and asks you if one of our rules matches. Install it, restart Claude Code, then ask it to run the command above.

Install lazaretto-guard

claude plugin marketplace add jamesdfinance-dev/lazaretto-plugins
claude plugin install lazaretto-guard@lazaretto-plugins

Tools it advertises

jackrabbit_get_organization jackrabbit_get_custom_field_labels jackrabbit_list_options jackrabbit_list_families jackrabbit_get_family jackrabbit_list_archived_families jackrabbit_list_contacts jackrabbit_get_contact jackrabbit_list_authorized_contacts jackrabbit_list_students jackrabbit_get_student jackrabbit_list_staff jackrabbit_get_staff_member jackrabbit_list_classes jackrabbit_get_class jackrabbit_get_class_roster jackrabbit_list_class_listings jackrabbit_list_enrollments jackrabbit_get_enrollment jackrabbit_list_attendance jackrabbit_list_waitlist_entries jackrabbit_get_franchise_revenue_summary jackrabbit_create_student jackrabbit_create_waitlist_entry

Tool changes

We compare every full read of this server with the one before. No change in what its tools say has been seen since we started keeping this record on 2026-10-30.

Fingerprint of its tools at our last full read (2026-11-01): f2cf42fc4f44da7f. A client can hash the tools it is served the same way and compare; the full value and a hash per tool are in this page as JSON.

Run this server? Show the check in your README

The badge reflects the latest weekly read:

Markdown

[![MCP tool check](https://lazaretto.dev/mcp-registry/io-usefulapi-jackrabbit-class/badge.svg)](https://lazaretto.dev/mcp-registry/io-usefulapi-jackrabbit-class)

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.