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Survey finds no public MCP servers fully validate latest protocol era

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A probe tested 78 public MCP servers last week to check their protocol era validation. None of the servers genuinely validated and served the newest 2026-07-28 protocol era with a working session. Most servers silently downgraded clients requesting the newest era, with 85% returning older protocol versions without signaling the downgrade. Some servers echoed client version claims verbatim without validation, creating potential interoperability issues. The probe developer released testing tools to help servers properly validate protocol eras.

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Survey finds no public MCP servers fully validate latest protocol era · ShortSingh