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Mcpreflight MCP Server

local only

Mcpreflight runs on your own machine — the client starts it, so there is no endpoint to ping. 616 installs a week from npm. Last commit 7 Nov 2026.

Read-only preflight for any MCP or x402 endpoint: handshake, tool schemas, 402 drift.

Installs per day peak 210 · avg 37 · +1644% w/w
a month agotoday
616
Installs / week
npm · @eidonze/mcpreflight
0
Stars
4 open issues
7 Nov 2026
Last commit
from GitHub
MIT
License
JavaScript

What the code does

We read the source, 1 h ago · rules 995398eba69f

Evidence

Things with no honest explanation: a promise that contradicts the code, code that runs at install time while hiding what it does, data leaving the machine.

    const child = spawn(process.execPath, [cliPath, ...args, '--json'], { stdio: ['ignore', 'pipe', 'pipe'] });
Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

    const child = spawn(process.execPath, [cliPath, ...args, '--json'], { stdio: ['ignore', 'pipe', 'pipe'] });

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

We found things in this code

Code changes quietly between releases, and nobody reads the diff of a dependency. We do, on every release — watch Mcpreflight and you get told the day something new turns up.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add mcpreflight -- npx -y @eidonze/mcpreflight
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "mcpreflight": {
      "command": "npx",
      "args": [
        "-y",
        "@eidonze/mcpreflight"
      ]
    }
  }
}
~/.codex/config.toml
[mcp_servers.mcpreflight]
command = "npx"
args = ["-y", "@eidonze/mcpreflight"]
.cursor/mcp.json
{
  "mcpServers": {
    "mcpreflight": {
      "command": "npx",
      "args": [
        "-y",
        "@eidonze/mcpreflight"
      ]
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "mcpreflight": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@eidonze/mcpreflight"
      ]
    }
  }
}

Alternatives to Mcpreflight

same job, measured the same way
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M
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Execute bias-drift-monitor-mcp
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Premium agentic endpoint for bias-drift-monitor-mcp.

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DCC-MCP Core
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Agent control plane for DCC and engine hosts: one MCP endpoint, one tool contract.

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Mcpreflight — questions

Answers built from our own checks of this server.

Why is there no uptime for Mcpreflight?
Mcpreflight runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package @eidonze/mcpreflight was installed 616 times last week.
How do I connect Mcpreflight?
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 runs locally, so the command pulls @eidonze/mcpreflight straight from npm; nothing to host, nothing to sign up for.
How many people use Mcpreflight?
The npm package @eidonze/mcpreflight was installed 616 times in the last week. Week over week that is +1644%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Mcpreflight open source?
Yes — it is published under the MIT licence, written in JavaScript, 0 stars on GitHub and 4 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.