-Two lines are maintained and only the newest release of each receives fixes: **2.x** (`main`) gets bug fixes, security fixes, and features; **1.x** ([`v1.x`](https://github.com/modelcontextprotocol/python-sdk/tree/v1.x)) gets critical bug fixes and security fixes. [SECURITY.md](https://github.com/modelcontextprotocol/python-sdk/blob/main/SECURITY.md) has the reporting process. Every release publishes notes on [GitHub Releases](https://github.com/modelcontextprotocol/python-sdk/releases); every breaking change between majors is documented in the [Migration Guide](https://py.sdk.modelcontextprotocol.io/migration/) before it merges; and pull requests that make one carry the `breaking change` label.
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