Preflight

Health and quality monitoring for the MCP ecosystem.

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What it can do

  • Preflight Check: Check the current health status of any MCP server. Returns real-time status (healthy/degraded/down/auth_required/payment_required/malformed), latency, uptime, and tool count. Call thi
  • Preflight Leaderboard: Get the current reliability leaderboard for all monitored MCP servers. Shows status, latency, and tool count. Ranked: healthy → degraded → auth_required → malformed → down.
  • Preflight Schema Changes: See recent schema changes across monitored MCP servers — which tools were added, removed, or had breaking parameter changes, and when.

What data it sees

Do you need an account

No: the server works without sign-in

Health and quality monitoring for the MCP ecosystem. Check any server's reliability before your agent depends on it.

Preflight monitors 18,000+ MCP servers every 10 minutes, tracking uptime, latency, schema stability, and description quality. Three tools:

  • preflight_check — real-time health status, latency, uptime, and quality score for any MCP server
  • preflight_leaderboard — the most and least reliable servers this week
  • preflight_schema_changes — what changed in a server's tool schema and when

Why use it: agents that call unreliable tools fail silently and waste tokens. A one-call preflight check prevents that. Think of it as SSL for tool calls — verify before you trust.

How to connect

How to connect Preflight to Claude

The server address to paste into Claude settings:

https://preflight--mthoburn.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect Preflight to ChatGPT

The server address to paste into ChatGPT settings:

https://preflight--mthoburn.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect Preflight to Cursor

The server address to paste into Cursor settings:

https://preflight--mthoburn.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (3)

Raw names from tools/list. Only developers need these.

preflight_checkCheck the current health status of any MCP server. Returns real-time status (healthy/degraded/down/auth_required/payment_required/malformed), latency, uptime, and tool count. Call this before your agent relies on an external tool to avoid silent failures.
preflight_leaderboardGet the current reliability leaderboard for all monitored MCP servers. Shows status, latency, and tool count. Ranked: healthy → degraded → auth_required → malformed → down.
preflight_schema_changesSee recent schema changes across monitored MCP servers — which tools were added, removed, or had breaking parameter changes, and when.