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Zero of 78 public MCP servers validate latest protocol era

By PulseAugur Editorial · [1 sources] ·

A recent probe of 78 public MCP servers revealed that none of them genuinely validate and serve the latest protocol era. A significant majority, 55%, defaulted to an older protocol version, and 85% silently downgraded clients requesting the newest era without any indication. A small subset of servers were found to blindly echo the client's requested protocol era, effectively lying about their support and posing an interoperability hazard for clients that rely on specific protocol features. AI

IMPACT Highlights potential interoperability issues in distributed systems that rely on protocol versioning.

RANK_REASON Analysis of a specific protocol's implementation across multiple servers. [lever_c_demoted from research: ic=1 ai=0.4]

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Zero of 78 public MCP servers validate latest protocol era

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Analysis of a specific protocol's implementation across multiple servers. [lever_c_demoted from research: ic=1 ai=0.4]
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Pennyforge ·

    Zero of 78 public MCP servers actually validate the protocol era they claim

    <p>Last week I published a probe for a quiet MCP failure: a server that compiles, passes its tests and answers the Inspector while silently downgrading newer protocol clients (<a href="https://github.com/modelcontextprotocol/typescript-sdk/issues/2977" rel="noopener noreferrer">t…

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