Is Lazaretto MCP safe to use?

Lazaretto MCP has no known CVEs as of the latest MCPpedia security scan. Authentication requirements were not detected automatically - check the project's documentation before connecting in a shared environment. Licensed under MIT.

How do I install Lazaretto MCP?

Lazaretto MCP supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What can Lazaretto MCP do?

Lazaretto MCP provides 3 tools: unverified, check_lockfile, find_attestation. See the full tools list on the server page for descriptions and parameters.

What AI clients work with Lazaretto MCP?

Lazaretto MCP is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.

Is Lazaretto MCP actively maintained?

Lazaretto MCP is actively maintained - last commit was 7 days ago. It has 1 GitHub stars.

Lazaretto MCP

Name: Lazaretto MCP
Author: lazaretto-ai

by lazaretto-ai

The Lazaretto MCP server and npm package: a free lockfile malware check, plus full scans of npm packages, agent skills and MCP servers.

1 3 tools GitHub

No known CVEs

MIT license

Actively maintained

Last commit 7d ago

Works with most clients

Transport: stdio, sse, http

3 tools · ~75 tok

Grade A · 0.0% of 200K ctx

MCPpedia last refreshed this data 1d ago

Edit this pageView history

Lazaretto MCP is an MCP server that the Lazaretto MCP server and npm package: a free lockfile malware check, plus full scans of npm packages, agent skills and MCP servers. Its tool list has not been published yet over stdio, sse and http, requires no API key, and scores 73/100 on MCPpedia's security, maintenance and efficiency rubric.

Security

Step 1

Install in your client

Config is the same across clients - only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "lazaretto": {
      "url": "https://lazaretto.dev/mcp?ref=npm",
      "type": "http"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

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[![MCPpedia Score](https://mcppedia.org/api/badge/lazaretto-mcp)](https://mcppedia.org/s/lazaretto-mcp)

Read me

What Lazaretto MCP does

Know what a package or MCP server does before you install or connect it.

Test This Server

This server supports HTTP transport. Be the first to test it - help the community know if it works.

Loading README…

Scored, not listed

Why this score

Five weighted categories - click any category to see the underlying evidence.

Score breakdown

73/100across 5 weighted dimensions

How we score →

0255075100

−27

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

No package registry to scan.

Inventory

Tools (3)

Click any tool to inspect its schema.

~75 tokens total

Community

Reviews

Be the first to review

Have you used this server?

Share your experience - it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Lazaretto MCP safe to use?: Lazaretto MCP has no known CVEs as of the latest MCPpedia security scan. Authentication requirements were not detected automatically - check the project's documentation before connecting in a shared environment. Licensed under MIT.
How do I install Lazaretto MCP?: Lazaretto MCP supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Lazaretto MCP do?: Lazaretto MCP provides 3 tools: unverified, check_lockfile, find_attestation. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Lazaretto MCP?: Lazaretto MCP is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is Lazaretto MCP actively maintained?: Lazaretto MCP is actively maintained - last commit was 7 days ago. It has 1 GitHub stars.

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Community

Discussion

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Has anyone used this with Cursor?How do you handle auth?Any alternatives?

Edit this pageView history

Security

Step 1

Install in your client

Config is the same across clients - only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "lazaretto": {
      "url": "https://lazaretto.dev/mcp?ref=npm",
      "type": "http"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/lazaretto-mcp)](https://mcppedia.org/s/lazaretto-mcp)

Read me

What Lazaretto MCP does

Know what a package or MCP server does before you install or connect it.

Test This Server

This server supports HTTP transport. Be the first to test it - help the community know if it works.

README

lazaretto-mcp

Know what a package or MCP server does before you install or connect it.

Lazaretto checks an npm package, an AI agent skill, or an MCP server for malicious behavior. This is the MCP server for it, so your agent can run the check itself.

Add it

In Claude, the fastest way is the Lazaretto connector in the Claude directory. Open it and add it. The connector needs no sign-in. It also works in ChatGPT, on some plans.

In Claude Code, one command:

claude mcp add --transport http lazaretto "https://lazaretto.dev/mcp?ref=npm"

For any other client, lazaretto.dev/add has the exact steps, and Set it up below covers Claude Code, Cursor, Gemini CLI and Cline. If your client only runs local servers, use npx -y lazaretto-mcp as the command, which needs Node 20 or newer.

ref=npm only tells us this page is where you found it. Leave it off and nothing changes.

Try the free check

In a project with a lockfile, ask your agent:

Use the lazaretto check_lockfile tool to check this project's dependencies.

Or run it in the browser at the free lockfile check, with no account.

What each check reads, and what it does not

The free lockfile check takes each exactly pinned package name and version. It matches them against the OSV and OpenSSF malicious-package advisories, which we sync daily. It does not read the code inside your packages. So it finds a release that has been reported, and it misses a bad release that no one has reported yet. A clean result means nothing matched. It does not prove a package is harmless.

A full scan goes further. A worker with no credentials fetches the package's files, never runs them, and reports what it finds with the file and line. A free key gets 10 scans a day.

This package is a thin front end for the Lazaretto API. It ships no detection logic and only makes HTTPS requests, so you can read it end to end.

Setting this up as an agent, with no other context? Read llms-install.md instead. It is the same information as a straight-line procedure.

Two ways to run it

	Hosted (recommended)	stdio package
Endpoint	`https://lazaretto.dev/mcp?ref=npm`	`npx -y lazaretto-mcp`
Install	nothing	Node 20 or newer
Key goes in	the `X-API-Key` header	the `LAZARETTO_API_KEY` env var
Get a free key in-session	yes, the `get_free_key` tool	no, `curl` the trial endpoint
Find a server for a job	yes, the `find_mcp_servers` tool	no
Reads your lockfile off disk	no, you pass the text	yes, from the working directory
Needs a client that speaks Streamable HTTP	yes	no

Eight tools are on both. Their arguments match except for these:

Tool	stdio package	Hosted
`check_lockfile`, `scan_lockfile_deep`	also take `path`, a lockfile on disk	no `path`
`scan_artifact`	`target_type`	`type`, plus `name` for inline content

The stdio package refuses an argument a tool does not take, and says what it does take.

The hosted server adds two free tools: find_mcp_servers, which finds a server for a job in the official MCP registry, and get_free_key, which mints a free developer key in the session. Pick the hosted one unless your client has no remote-server support, or you want check_lockfile to read the lockfile off disk so a large tree never passes through the model context.

Set it up

Claude Code

Hosted, one command:

claude mcp add --transport http lazaretto "https://lazaretto.dev/mcp?ref=npm"

With a key f

... View full README on GitHub

Loading README…

Scored, not listed

Why this score

Five weighted categories - click any category to see the underlying evidence.

Score breakdown

73/100across 5 weighted dimensions

How we score →

0255075100

−27

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

No package registry to scan.

Inventory

Tools (3)

Click any tool to inspect its schema.

~75 tokens total

Community

Reviews

Be the first to review

Have you used this server?

Share your experience - it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Lazaretto MCP safe to use?: Lazaretto MCP has no known CVEs as of the latest MCPpedia security scan. Authentication requirements were not detected automatically - check the project's documentation before connecting in a shared environment. Licensed under MIT.
How do I install Lazaretto MCP?: Lazaretto MCP supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Lazaretto MCP do?: Lazaretto MCP provides 3 tools: unverified, check_lockfile, find_attestation. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Lazaretto MCP?: Lazaretto MCP is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is Lazaretto MCP actively maintained?: Lazaretto MCP is actively maintained - last commit was 7 days ago. It has 1 GitHub stars.