MCP.Market

WebMCP Demo Store MCP server

online · 100% uptime
by kamatanuj·io.github.kamatanuj/webmcp-store·v1.0.0
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WebMCP demo store: same catalog via MCP tool calls vs DOM scraping. -79% bytes, -42% tokens.

A91/100grade A
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Safety scan
A91/100

full report

Adoption
Growing

0 stars

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If you have run it, two minutes of your experience saves the next person an afternoon.

WebMCP Demo Store tools (5)

write = sends, deletes, buys or posts
  • add_to_cartFree

    Add product to cart (qty default 1).

  • checkoutFree

    Place order for current cart. Returns order id.

  • get_cartFree

    Current cart contents and total.

  • get_product_detailsFree

    Full details of one product by id.

  • search_productsFree

    Search product catalog. Filter by category (mice|laptops|phones), max_price (INR), min_rating, brand substring.

Public scan report

scanner v0.1.10 · 2026-10-28 · same rubric, same numbers if you re-run it

no findings
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 1971ms20/20
  • Tool poisoning5 tool descriptions checked15/15
  • Auth qualityopen endpoint, read-only tools10/15
  • Maintenancelast push 6 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 91/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How WebMCP Demo Store compares

Against every graded E-commerce MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
91/100
higher than 90% of 2,174 E-commerce servers
Tools
5
the typical E-commerce server has 6
Tools that change things
0%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote E-commerce server answers 100%
Response time
772 ms
faster than 17% of 1,527 E-commerce servers

What its tools let an agent do: 4 read · 1 create

Install WebMCP Demo Store in Claude Code, Cursor or VS Code

claude mcp add --transport http webmcp-store https://demowithmcp.converso.work/mcp
Add to Cursor

What the publisher says

From the WebMCP Demo Store repository's README, as published. We do not edit it. Read it on GitHub

WebMCP Demo Store — one-file server, two modes, one benchmark

Same store, same tools, two delivery modes:

  • WebMCP mode — the page exposes its catalog through MCP tool calls (MCP-over-HTTP /mcp, plus Chrome-native document.modelContext), so an agent reads only what the task needs.
  • Plain mode — the same store as an ordinary website; the agent parses full HTML pages, as every agent must today.

Benchmark (150-product catalog, identical tasks): 79% less action bytes, 42% fewer input tokens, 8/8 tasks correct in both modes. DOM mode wins on small catalogs then collapses; WebMCP wins with age. Crossover report: report.html → WebMCPComparisonReport.pdf.

Run it

python3 server.py                    # plain mode      → http://localhost:9501
MCP=1 PORT=9502 python3 server.py    # WebMCP mode     → http://localhost:9502 + /mcp

stdlib-only (http.server, json, uuid, threading) — no pip install, no dependencies.

Live demos

  • plain: https://demonomcp.converso.work
  • WebMCP: https://demowithmcp.converso.work (.well-known/mcp discovery, /mcp endpoint)
  • launch package (deck, whitepaper, reports): https://demowithmcp.converso.work/launch.html

Chrome-native WebMCP test (13 Oct 2026)

Chrome 154 + --enable-features=WebMCP exposes document.modelContext on HTTPS origins (about:blank excluded).

  • Registered the 5-tool store contract via the IMPERATIVE API (registerTool): searchproducts, addtocart, getcart, checkout (server-backed; all fetches in-page).
  • Standard client flow verified: getTools() discovery → executeTool() calls → orders 1017/1018 placed, T2/T4/T8 picks correct (HP Pavilion 14, Razer DeathAdder, OnePlus 12R).
  • 154 build quirks found & worked around:
  1. executeTool(tool, args) requires args as a JSON string (object form throws "Failed to parse input arguments"); return values are JSON strings too — JSON.parse both sides.
  2. Tools can't be re-registered under the same name (InvalidStateError) — reload the page to reset.
  3. Flag/feature name: --enable-features=WebMCP works headless; docs' chrome://flags/#enable-webmcp-testing is the manual path. Note: API is document.modelContext (moved from navigator since July 2026 build).
  • Takeaway: the demo's tool contract is compatible with Chrome's native WebMCP, not just our JSON-RPC shim. When Chrome ships the client agent (Gemini-in-Chrome), the store is already agent-ready.

Repo layout

License

MIT.

Nothing above is checked by us. What we check is on the safety report.

WebMCP Demo Store: common questions

Is WebMCP Demo Store MCP server safe?
Yes, by our scan: it is graded A (91/100). Read the WebMCP Demo Store safety report
How do I install WebMCP Demo Store?
It runs remotely at demowithmcp.converso.work. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does WebMCP Demo Store need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is WebMCP Demo Store maintained?
The last commit was 14 days ago (2026-10-21). The latest release is v1.0.0.
Is WebMCP Demo Store up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of WebMCP Demo Store?
Servers from other publishers that do the same job: Buywhere MCP server, Apify MCP server and Mneme Memory MCP server.
How does WebMCP Demo Store compare with other E-commerce MCP servers?
safety score 91/100 (higher than 90% of 2,174 E-commerce servers); tools 5 (the typical E-commerce server has 6); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to WebMCP Demo Store

Same job from other publishers: the closest match first, then the best rated.

  • Buywhere
    Agent-native product catalog: 300M+ products, 150,000+ stores, deliver_to ranking.
    A
  • Apify
    Extract data from any website with thousands of scrapers, crawlers, and automations on Apify Store ⚡
    A
  • Mneme Memory
    Cross-session memory for AI coding agents via six tools; local-first SQLite store.
    A
  • Heimdall
    Every App Store Connect + StoreKit 2 endpoint. 929 tools in 13 profiles, narrow to 27.
    B
  • COTAL actions (cotal.ai)
    cotal.ai actions: product overview, site search, build log, feedback, Cloud waitlist, updates, calls
    B