Preflight – Test your MCP server before submitting to Claude/OpenAI

Name: Preflight – Test your MCP server before submitting to Claude/OpenAI
Availability: InStock
Author: mengjiang

by mengjiang·Apr 23, 2026·4 points·0 comments

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AI Analysis

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Cuts MCP directory rejection wait from 30 days to 15 seconds.

Strengths

•Targets painful directory review wait times with immediate, actionable feedback.
•Checks OAuth PKCE and CORS failures without requiring code access.
•Free and no signup removes friction for developers testing multiple iterations.

Weaknesses

•Only validates live endpoints, so local development errors still slip through.
•Niche utility limited to the small current population of MCP builders.

Post Description

I submitted an MCP server to Claude and OpenAI, got rejected from OpenAI after 4 weeks for a stupid OAuth redirect bug. Fix took an hour. Resubmit wait was another 3 weeks.

Every check they run is something you can test locally in 15 seconds, so I built preflight for everyone to use. FREE.

So: https://m8ven.ai/preflight — paste your URL, get the report. Free, no signup, probes your live endpoint only (doesn't touch your code).

Built this out of M8ven, which I'm working on as an trust layer for the agent economy. Keeping Preflight free because the rejection loop is a stupid tax on people shipping.

Would love to hear failure modes I'm not catching.