PREFLIGHT MCP

PREFLIGHT provides routing intelligence for AI agents before they visit a URL. It recommends the cheapest likely route to try first among HTTP, BROWSER, MACHINE_ENDPOINT, or AVOID. The server exposes tools to check URL accessibility and provide feedback to improve future recommendations based on aggregated success or failure evidence.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Community listingStreamable HTTPNo sign-inEndpoint checked 2026-11-06Published by GSterlingPress

MCP endpoint (Streamable HTTP)

https://preflight-api-production-01a2.up.railway.app/mcp

Vendor documentation

What its tools do

2 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Read-only (1)

preflight_check

Can change data (1)

preflight_feedback

2 of 2 have a description · 2 of 2 declare behavior hints · 1 of 2 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

Passed Endpoint answered the live check · Nov 6, 2026, 3:15 PM UTC
Availability 1 of 1 checks passed in 30 days

What you can do with it

Decide whether to use HTTP, browser, or machine endpoint before fetching an unfamiliar URL
Report route success or failure to improve future routing recommendations
Avoid wasteful fetching by checking access signals and estimated token size first

Source and maintenance

Community listingRegistry 0.7.6

mcp-registry: io.github.GSterlingPress/preflight@0.7.6 Source repository Project website

Maintenance checked: Nov 6, 2026, 2:37 PM UTC

Protocol and capabilities

Server: PREFLIGHT 0.7.5
MCP protocol negotiated in check: 2025-11-25
Tools: 2 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

When a task requires visiting an unfamiliar http/https URL, call preflight_check BEFORE the first fetch, browser, crawl, or scrape attempt. Pass the ACTUAL destination URL from the task. PREFLIGHT is a cheap routing decision, not the fetch itself: it returns HTTP, BROWSER, MACHINE_ENDPOINT, or AVOID. Do not use example.com when a real destination is available. Use preflight_feedback after the attempt when possible.

Tools

2 advertised

preflight_check — Check URL Before Fetching

Advertised by the server during the last successful anonymous check.

Advertised read-onlyOpen-world

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_check input schema

{
  "type": "object",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "format": "uri",
      "description": "Actual absolute http/https destination URL from the current task. Use before the first fetch or browser request."
    }
  },
  "additionalProperties": false
}

preflight_check annotations

{
  "title": "Check URL Before Fetching",
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}

preflight_feedback — Report PREFLIGHT Outcome

Advertised by the server during the last successful anonymous check.

After following a PREFLIGHT recommendation, report whether the chosen route worked so PREFLIGHT can improve future recommendations.

preflight_feedback input schema

{
  "type": "object",
  "required": [
    "url",
    "route",
    "outcome"
  ],
  "properties": {
    "url": {
      "type": "string",
      "format": "uri"
    },
    "route": {
      "enum": [
        "HTTP",
        "BROWSER",
        "MACHINE_ENDPOINT",
        "AVOID"
      ],
      "type": "string"
    },
    "outcome": {
      "enum": [
        "success",
        "failure"
      ],
      "type": "string"
    },
    "latencyMs": {
      "type": "number",
      "maximum": 300000,
      "minimum": 0
    }
  },
  "additionalProperties": false
}

preflight_feedback annotations

{
  "title": "Report PREFLIGHT Outcome",
  "readOnlyHint": false,
  "openWorldHint": false,
  "idempotentHint": false,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (2 of 2 answered).

2026-11-06: 1 of 1 checks answered
2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 1132 ms
95th percentile latency: 1132 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 6, 2026, 3:15 PM UTC · probe · passed · 1132 ms · metadata changed · 2 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http preflight-mcp-railway https://preflight-api-production-01a2.up.railway.app/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add preflight-mcp-railway --url https://preflight-api-production-01a2.up.railway.app/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable preflight-mcp-railway in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "preflight-mcp-railway": {
      "url": "https://preflight-api-production-01a2.up.railway.app/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "preflight-mcp-railway": {
      "type": "streamableHttp",
      "url": "https://preflight-api-production-01a2.up.railway.app/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start preflight-mcp-railway and inspect its tools.

VS Code configuration

{
  "servers": {
    "preflight-mcp-railway": {
      "type": "http",
      "url": "https://preflight-api-production-01a2.up.railway.app/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http preflight-mcp-railway https://preflight-api-production-01a2.up.railway.app/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.

Claude Desktop configuration

https://preflight-api-production-01a2.up.railway.app/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "preflight-mcp-railway": {
      "serverUrl": "https://preflight-api-production-01a2.up.railway.app/mcp"
    }
  }
}

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