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Python MCP SDK 2.0 update breaks wrapper libraries

By PulseAugur Editorial · [1 sources] ·

The Python MCP SDK recently underwent a major version update to 2.0.0, introducing breaking changes that have affected wrapper libraries. Key modifications include the removal of the `streamablehttp_client` and its context manager yielding only two values instead of three, leading to runtime errors. Additionally, transport-specific keyword arguments like `timeout` and `sse_read_timeout` have been removed from `StreamableHTTPTransport` and must now be set on the `httpx2.AsyncClient`. AI

IMPACT Breaking changes in SDKs can disrupt AI development workflows that rely on these libraries, requiring developers to update dependencies or code.

RANK_REASON The item details a breaking change in a specific software library and its impact on dependent tools, rather than a new release from a frontier AI lab.

Read on dev.to — MCP tag →

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

Python MCP SDK 2.0 update breaks wrapper libraries

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12 / 100
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Tool
The item details a breaking change in a specific software library and its impact on dependent tools, rather than a new release from a frontier AI lab.
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product, infra
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Standard
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Breaking (< 6h)
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · MilkyWay008 ·

    The MCP Python SDK 2.0 broke the wrapper libraries. Here's how to spot it and pin back

    <p>If your MCP tools started failing a few weeks ago and nothing in your own code changed, you're not imagining it.</p> <p>The official Python <code>mcp</code> package shipped 2.0.0 on 2026-07-28. It's a real major version, with public APIs removed and renamed. Latest on PyPI rig…

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