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Update the v2 status banner and pin spawned environments to the running SDK version (#2834)
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Max 2026-06-11 09:41:19 +01:00 • committed by GitHub
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@ -18,8 +18,9 @@
> [!NOTE]
> **This README documents v1.x of the MCP Python SDK (the current stable release).**
>
> For v1.x code and documentation, see the [`v1.x` branch](https://github.com/modelcontextprotocol/python-sdk/tree/v1.x).
> For the upcoming v2 documentation (pre-alpha, in development on `main`), see [`README.v2.md`](README.v2.md).
> **v2 is in alpha.** Pre-releases are published to PyPI as `2.0.0aN` and can be installed with an explicit pin, for example `pip install mcp==2.0.0a1`. See [`README.v2.md`](README.v2.md) for the v2 documentation and the [migration guide](docs/migration.md) for what's changed. We're targeting a beta on 2026-06-30 and a stable v2 on 2026-07-27. If your package depends on `mcp`, add a `<2` upper bound to your version constraint (for example `mcp>=1.27,<2`) before the stable release lands.
>
> For v1.x code and documentation, see the [`v1.x` branch](https://github.com/modelcontextprotocol/python-sdk/tree/v1.x). v1.x is in maintenance mode and continues to receive critical bug fixes and security patches.
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## Table of Contents