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Notary MCP Server

by clawhard Your server? Claim it
answering

Notary is answering right now. Last checked 13 min ago. It exposes 1 tools.

Check npm and PyPI packages exist before install: versions, age, downloads, look-alikes.

Uptime history 22 hours of history
22 hours agonow
100.0%
Uptime 24h
82 of 82 checks
1
Tools
read from the server
131 ms
Response time
average over 24h
open, no key
Access
streamable-http

Nothing serious here today

Today is the operative word: we check Notary every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.

run in your terminal
claude mcp add notary --transport http https://notary.clawhard.com/mcp
Settings → Connectors → Add custom connector, then paste this address
https://notary.clawhard.com/mcp
~/.codex/config.toml
[mcp_servers.notary]
url = "https://notary.clawhard.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "notary": {
      "url": "https://notary.clawhard.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "notary": {
      "type": "http",
      "url": "https://notary.clawhard.com/mcp"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

notary
notary_check_packages
Use when the user or an agent is about to install or import npm or PyPI packages: before npm install or pip install, when adding lines to package.json or requirements.txt, or when a package name came from an AI answer, a tutorial or memory and may be invented. Looks each name up in the live registry and returns whether it exists, the latest version, whether a pinned version exists, weekly downloads, first and last publish dates, deprecation or yanked status, install-time scripts, whether the name is one or two typed characters from a well-known package, and real similar packages when the name does not exist. Example: {"packages":[{"ecosystem":"npm","name":"@anthropic/mcp-client"},{"ecosystem":"pypi","name":"requests","version":"2.32.3"}]}. Up to 10 packages per call; versions must be exact, not ranges. Not a malware or vulnerability scan: "ok" means it exists and nothing looked wrong.

Endpoints

URLTransportStateLatencyChecked
https://notary.clawhard.com/mcp streamable-http answering 125 ms 13 min ago

Alternatives to Notary

same job, measured the same way
Attestari
by attestari

Attestari's verdict on an npm or PyPI package version, asked before an agent installs it.

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ExactGround
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Check npm/PyPI packages exist and that a function or method exists in an exact package version.

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Presend MCP Server
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Look up npm and PyPI packages: versions, descriptions, and metadata. No key required.

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Pkgtruth
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Catches hallucinated and slopsquatted npm and PyPI packages before an agent installs them.

67 installs/wk local only
PackageGuard
by dankaten

x402-gated safety checker for npm/PyPI packages before you npm install / pip install.

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HALLUX
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Check that a package, module or DOI exists before an agent installs, imports or cites it.

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Cairn Commons (read-only)
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Read-only: look up checked dependency bugs and check versions before installing. No account.

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Notary — questions

Answers built from our own checks of this server.

What can Notary do?
It exposes 1 tools, read directly from the server on our last check. Among them: notary_check_packages. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Notary working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 82 of 82 checks got a reply (100.0%), average response time 131 ms. The bar chart above shows every period we have measured.
How do I connect Notary?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Notary need an API key?
No. Notary completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Notary?
It answers our handshake in 131 ms on average, which is faster than 86% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.