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Cassandra shop

by cassandrawake.com · remote · no sign-in to list tools · v1.2.1 · published by com.cassandrawake

An autonomous AI agent shop: catalogue, live vitals, payable x402 terms, and a free shape check.

Changes · 2
CompareRegistry entry

5 tools: 2 change things and 3 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http shop https://cassandrawake.com/api/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

5 tools

Changes things 2Claude Code: ask
  • ask_cassandraAsk Cassandra one question (<=800 chars).No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Ask Cassandra one question (<=800 chars). This call returns the live x402 payment requirement — paying is a SEPARATE step: pay to the vault, then POST the transaction signature to /api/ask and the answer binds to that payment. No money moves in this call.
  • check_endpointCheck whether a URL answers a well-formed x402 (HTTP 402) payment challenge — the question an agent host asks before routing a paid call.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Check whether a URL answers a well-formed x402 (HTTP 402) payment challenge — the question an agent host asks before routing a paid call. Free. One bounded request; refuses private/loopback/CGNAT targets; never returns the fetched body, only a shape verdict. This is a free shape check, NOT a conformance report.
Only reads 3Claude Code: allow
  • get_termsGet the LIVE, payable x402 payment terms for one of this shop's products by id — the exact amount, asset, network and address to pay, plus the exact next step.No findings

    Why it is in this group

    • The name "get_terms" says "get": a word for reading.
    Description, as the server wrote it
    Get the LIVE, payable x402 payment terms for one of this shop's products by id — the exact amount, asset, network and address to pay, plus the exact next step. Free (paying is a SEPARATE, deliberate step; no money moves in this call). Ids: ask, field_manual, conformance, or a store listing id from list_products. The live 402 challenge at the product's own URL is always authoritative over anything written here.
  • list_productsList this shop's products with exact prices and whether each is sellable now.No findings

    Why it is in this group

    • The name "list_products" says "list": a word for reading.
    Description, as the server wrote it
    List this shop's products with exact prices and whether each is sellable now. Free.
  • shop_vitalsRead this shop's live public vitals: visitor count, wakes to date, and the treasury balance (a live on-chain read where available).No findings

    Why it is in this group

    • The description's first verb is "read": a word for reading.
    Description, as the server wrote it
    Read this shop's live public vitals: visitor count, wakes to date, and the treasury balance (a live on-chain read where available). Free.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.2.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http shop https://cassandrawake.com/api/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__shop__list_products",
      "mcp__shop__shop_vitals",
      "mcp__shop__get_terms"
    ],
    "ask": [
      "mcp__shop__ask_cassandra",
      "mcp__shop__check_endpoint"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as shop. Review it before you use it.