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PREFLIGHT — URL Routing for AI Agents MCP Server

by gsterlingpress Your server? Claim it
answering

PREFLIGHT — URL Routing for AI Agents is answering right now. Last checked 8 min ago. It exposes 2 tools. Last commit 13 Sep 2026.

Choose HTTP, browser, machine endpoint, or avoid before an agent visits an unfamiliar URL.

Uptime history 68 days of history · worst day 96%
68 days agonow
100.0%
Uptime 24h
92 of 92 checks
2
Tools
read from the server
434 ms
Response time
average over 24h
0
Stars
last commit 13 Sep 2026

What changed 13

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 11 August 2026. No other catalogue keeps this.

14 Aug a tool changed version
13 Aug 2 tools changed the parameters they ask for preflight_check, preflight_feedback
13 Aug a tool description was rewritten preflight_check
12 Aug a tool changed version2 times that day
12 Aug 2 tool descriptions were rewritten preflight_check, preflight_feedback
12 Aug a tool changed the parameters it asks for preflight_check
11 Aug 2 tool descriptions were rewritten preflight_check, preflight_feedback
11 Aug a tool changed the parameters it asks for preflight_check
11 Aug a tool changed version
and 1 more, back to 11 August 2026

Nothing serious here today

Today is the operative word: we check PREFLIGHT — URL Routing for AI Agents 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 8 min ago.

run in your terminal
claude mcp add preflight --transport http https://preflight-api-production-01a2.up.railway.app/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "preflight": {
      "url": "https://preflight-api-production-01a2.up.railway.app/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.preflight]
url = "https://preflight-api-production-01a2.up.railway.app/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "preflight": {
      "url": "https://preflight-api-production-01a2.up.railway.app/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "preflight": {
      "url": "https://preflight-api-production-01a2.up.railway.app/mcp"
    }
  }
}

Available tools 2

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

preflight
preflight_check
Before fetching, crawling, scraping, opening, or browser-rendering an unfamiliar http/https URL, call this with the ACTUAL destination URL. Returns the best first route: HTTP, BROWSER, MACHINE_ENDPOINT, or AVOID, plus access/JS/size/cost hints. Do not substitute example.com when a real task URL is available.
preflight_feedback
After following a PREFLIGHT recommendation, report whether the chosen route worked so PREFLIGHT can improve future recommendations.

Endpoints

URLTransportStateLatencyChecked
https://preflight-api-production-01a2.up.railway.app/mcp streamable-http answering 393 ms 8 min ago

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PREFLIGHT — URL Routing for AI Agents — questions

Answers built from our own checks of this server.

What can PREFLIGHT — URL Routing for AI Agents do?
It exposes 2 tools, read directly from the server on our last check. Among them: preflight_check, preflight_feedback. 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 PREFLIGHT — URL Routing for AI Agents working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 434 ms. The bar chart above shows every period we have measured.
How do I connect PREFLIGHT — URL Routing for AI Agents?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does PREFLIGHT — URL Routing for AI Agents need an API key?
No. PREFLIGHT — URL Routing for AI Agents completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is PREFLIGHT — URL Routing for AI Agents?
It answers our handshake in 434 ms on average, which is faster than 28% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is PREFLIGHT — URL Routing for AI Agents open source?
We cannot say either way: written in JavaScript, 0 stars on GitHub and 1 open issue, but we could not determine the licence, and without one the code is not open source by default.