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Older MCP servers fail with Pydantic 2.14 due to removed function

By PulseAugur Editorial · [1 sources] ·

Older versions of MCP servers (specifically, versions below 1.10) are encountering startup failures when attempting to use Pydantic version 2.14. This issue arises because Pydantic 2.14 removed the internal `eval_type_backport` function, which these older MCP servers rely on. The solution involves pinning the Pydantic version to below 2.14 in the uvx configuration for these servers. After applying this fix, users should verify that each server successfully initializes. AI

IMPACT This is a technical issue related to software dependencies and does not have a direct impact on AI operations or development.

RANK_REASON This item details a specific software dependency conflict and its resolution, which is a common issue in software development tooling.

Read on dev.to — MCP tag →

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

Older MCP servers fail with Pydantic 2.14 due to removed function

How we ranked this

Signal score
2 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
This item details a specific software dependency conflict and its resolution, which is a common issue in software development tooling.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
infra, product
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Low
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Breaking (< 6h)
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Full methodology in our editorial standards.

COVERAGE [1]

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

    Why uvx MCP servers fail with Pydantic 2.14

    <blockquote> <p>📝 Originally published (in Japanese) at <a href="https://forge.workstyle.tech/blog/pydantic-214-breaks-old-mcp-servers/?utm_source=devto&amp;utm_medium=crosspost&amp;utm_campaign=pydantic-214-breaks-old-mcp-servers" rel="noopener noreferrer">forge.workstyle.tech</…

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