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Python MCP servers break en masse after SDK upgrade

By PulseAugur Editorial · [1 sources] ·

A weekly automated check of Python MCP servers revealed that 19% of them, totaling 932 packages, failed to start due to an SDK upgrade. The issue stems from the release of MCP SDK version 2.0.0, which changed module names and broke compatibility with packages that did not specify a version bound for the MCP dependency. While a simple fix of pinning the dependency to a version less than 2 resolves the issue for 88% of affected servers, a significant portion of these packages have outdated registry entries, meaning the actual number of broken projects may be lower than reported. AI

IMPACT This SDK upgrade issue highlights the fragility of package ecosystems and the importance of dependency management for AI development tools.

RANK_REASON The item describes a tool (mcpcost) used to test the compatibility of Python packages with an SDK upgrade, detailing the process and findings.

Read on dev.to — MCP tag →

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

Python MCP servers break en masse after SDK upgrade

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35 / 100
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Tool
The item describes a tool (mcpcost) used to test the compatibility of Python packages with an SDK upgrade, detailing the process and findings.
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High
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Breaking (< 6h)
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COVERAGE [1]

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

    I install every PyPI server in the MCP registry each week. 932 of them stop on the same SDK upgrade

    <p>Once a week a job of mine installs every Python MCP server in the official registry, starts it, and asks it for its tools. There are 4,881 of them. In the newest run <strong>2,200 started. 932 did not, and all 932 fail for the same reason</strong>: they were written for versio…

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