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Lowvyn

by lowvyn.com · remote · no sign-in to list tools · v0.1.2 · published by com.lowvyn

Verify Canadian deals, find the same product cheaper across .ca retailers, track CAD price history.

Changes · 1
CompareRegistry entry

8 tools: 1 change things and 7 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 lowvyn https://api.lowvyn.com/mcp

Tools

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

8 tools

Changes things 1Claude Code: ask
  • verify_dealGiven a product (by Lowvyn ID, retailer URL, or a lowvyn.com product URL from another tool's result) and an optional claimed price, return whether the deal is genuine.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
    Given a product (by Lowvyn ID, retailer URL, or a lowvyn.com product URL from another tool's result) and an optional claimed price, return whether the deal is genuine. Compares against Lowvyn's price history and returns a verdict ('real_deal', 'modest_deal', 'average', 'bad_time', 'insufficient_data') plus an explanation. Use this first when a user asks 'is this actually a good price?'. Accepts the id or canonicalUrl from a search_products / intent_search result directly.
Only reads 7Claude Code: allow
  • find_cheaperGiven a product (by Lowvyn ID or retailer URL), return the same physical product on other Canadian retailers with their current prices and savings.Reads text others writeNo findings

    Why it is in this group

    • The name "find_cheaper" says "find": a word for reading.

    What it can reach

    • untrusted-inputThe description's first sentence says "url": it reads web pages, which anyone can write.
    Description, as the server wrote it
    Given a product (by Lowvyn ID or retailer URL), return the same physical product on other Canadian retailers with their current prices and savings. Uses verified UPC matches. Use this when a user wants to know 'can I get this cheaper somewhere else?'.
  • get_categoriesList the product categories Lowvyn covers, with item counts.No findings

    Why it is in this group

    • The name "get_categories" says "get": a word for reading.
    Description, as the server wrote it
    List the product categories Lowvyn covers, with item counts. Useful for narrowing search_products calls.
  • get_price_historyReturn the daily price history for a product as (date, price) pairs, up to N days.No findings

    Why it is in this group

    • The name "get_price_history" says "get": a word for reading.
    Description, as the server wrote it
    Return the daily price history for a product as (date, price) pairs, up to N days. Use this to verify whether a 'sale' is genuine or whether the price has been higher in the past, or to show a price trend in an answer to the user.
  • get_productLook up a product by Lowvyn ID OR retailer URL (amazon.ca / walmart.ca / bestbuy.ca / canadiantire.ca).Reads text others writeNo findings

    Why it is in this group

    • The name "get_product" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe description's first sentence says "url": it reads web pages, which anyone can write.
    Description, as the server wrote it
    Look up a product by Lowvyn ID OR retailer URL (amazon.ca / walmart.ca / bestbuy.ca / canadiantire.ca). Returns title, current price (CAD), Lowvyn Score (0-100), Deal Verdict, and price summary (current / all-time low / all-time high).
  • get_retailersList the Canadian retailers Lowvyn currently tracks, with item counts and last-update timestamps.No findings

    Why it is in this group

    • The name "get_retailers" says "get": a word for reading.
    Description, as the server wrote it
    List the Canadian retailers Lowvyn currently tracks, with item counts and last-update timestamps.
  • search_productsSearch the Canadian product catalogue.No findings

    Why it is in this group

    • The name "search_products" says "search": a word for reading.
    Description, as the server wrote it
    Search the Canadian product catalogue. Filter by category slug, max price (CAD), and retailer. Returns up to 20 matching products with current price and Lowvyn Score. Use this when a user is exploring what is available in a category rather than asking about a specific product. Each result carries an id + canonicalUrl you can pass to get_product, verify_deal, find_cheaper, or get_price_history.

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.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or outbound.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write2
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Looked at Oct 22, 2026, 14:35 UTC, unchanged since Oct 22, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable
yes
HTTP status of an anonymous initialize
200
tools/list served without credentials
yes
Tools that change things, listed without credentials
1
Protocol version
2025-06-18
WWW-Authenticate on 401
not observed
resource_metadata in WWW-Authenticate
none
RFC 9728 protected resource metadata
none
Authorization servers
none
Legacy HTTP+SSE transport
no
Dynamic client registration
not observed
Client ID metadata documents
not observed
  • WarnThe whole server

    The endpoint served tools/list without credentials, and the list has 1 tool that changes things (1 write). Whether a call also works without credentials was not tested: tools are never called.

    Matched text

    https://api.lowvyn.com/mcp: tools/list returned 8 tools to an anonymous client, including verify_deal (write)

    What this check looks for

Install

Pinned to version 0.1.2. Values in angle brackets are yours to fill in.

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

Run in a terminal.

Claude Code permissions

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

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__lowvyn__find_cheaper",
      "mcp__lowvyn__get_categories",
      "mcp__lowvyn__get_price_history",
      "mcp__lowvyn__get_product",
      "mcp__lowvyn__get_retailers",
      "mcp__lowvyn__intent_search",
      "mcp__lowvyn__search_products"
    ],
    "ask": [
      "mcp__lowvyn__verify_deal"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as lowvyn. Review it before you use it.

Capability tags behind 2 rules
  • mcp__lowvyn__find_cheaper untrusted-input
  • mcp__lowvyn__get_product untrusted-input