MCP registry listings fail more as they age, but platform matters most

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An analysis of 1,092 MCP registry server listings found that older entries fail at significantly higher rates, with listings older than 92 days showing 2.6 times the odds of failure compared to newer ones. The study drew on 66,045 version records from the MCP registry, joined to a July 2026 census of live endpoints across platforms including Railway, Vercel, Render, and Fly.dev. Railway showed the starkest age-related decay, with failure rates climbing from 3% for listings under 30 days old to 83% beyond 180 days. However, the raw pooled trend was found to be largely a Simpson's paradox artifact — older listings are disproportionately concentrated on platforms that already have high failure rates. Stratifying by platform confirmed that age has a genuine but smaller independent effect, suggesting both platform and listing age should be used together when prioritizing revalidation queues.

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