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.
We read the source, 1 h ago · rules 995398eba69f
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'] });
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.
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.
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.
claude mcp add mcpreflight -- npx -y @eidonze/mcpreflight
{
"mcpServers": {
"mcpreflight": {
"command": "npx",
"args": [
"-y",
"@eidonze/mcpreflight"
]
}
}
}
[mcp_servers.mcpreflight]
command = "npx"
args = ["-y", "@eidonze/mcpreflight"]
{
"mcpServers": {
"mcpreflight": {
"command": "npx",
"args": [
"-y",
"@eidonze/mcpreflight"
]
}
}
}
{
"servers": {
"mcpreflight": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@eidonze/mcpreflight"
]
}
}
}
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Answers built from our own checks of this server.