# MCP Python SDK v1.28.1

- Product: MCP Python SDK (https://whatsnew.fyi/product/mcp-python-sdk)
- Vendor: Anthropic
- Date: 2026-06-26
- Version: v1.28.1
- Original notes: https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.28.1
- Permalink: https://whatsnew.fyi/product/mcp-python-sdk/releases/v1.28.1

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — Buffer per-request StreamableHTTP streams and store priming event before dispatch
- **changed** — Set Development Status classifier to Production/Stable
- **added** — Support TransportSecuritySettings in the WebSocket server transport

##### What's Changed
* [v1.x] Buffer per-request StreamableHTTP streams; store priming event before dispatch by @maxisbey in https://github.com/modelcontextprotocol/python-sdk/pull/2948
* [v1.x] Set Development Status classifier to Production/Stable by @maxisbey in https://github.com/modelcontextprotocol/python-sdk/pull/2976
* [v1.x] Support TransportSecuritySettings in the WebSocket server transport by @maxisbey in https://github.com/modelcontextprotocol/python-sdk/pull/2992


**Full Changelog**: https://github.com/modelcontextprotocol/python-sdk/compare/v1.28.0...v1.28.1