# MCP Python SDK v1.29.0

- Product: MCP Python SDK (https://whatsnew.fyi/product/mcp-python-sdk)
- Vendor: Anthropic
- Date: 2026-07-28
- Version: v1.29.0
- Original notes: https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.29.0
- Permalink: https://whatsnew.fyi/product/mcp-python-sdk/releases/v1.29.0

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** — Route Context.report_progress() to the originating request stream
- **added** — Add Streamable HTTP request body limits
- **fixed** — Reject trailing newline in tool-name validation

##### What's Changed
* [v1.x] Route Context.report_progress() to the originating request stream by @maxisbey in https://github.com/modelcontextprotocol/python-sdk/pull/2994
* [v1.x] docs: publish llms.txt and markdown renditions of the docs by @maxisbey in https://github.com/modelcontextprotocol/python-sdk/pull/3029
* [v1.x] docs: pin mkdocs<2 by @maxisbey in https://github.com/modelcontextprotocol/python-sdk/pull/3074
* [v1.x] Add Streamable HTTP request body limits by @Kludex in https://github.com/modelcontextprotocol/python-sdk/pull/3101
* [v1.x] fix: reject trailing newline in tool-name validation by @maxisbey in https://github.com/modelcontextprotocol/python-sdk/pull/3086
* [v1.x] ci: pick the docs toolchain per worktree in build-docs.sh by @maxisbey in https://github.com/modelcontextprotocol/python-sdk/pull/3082
* [v1.x] Move the v1.x docs to /v1/ and mark v1.x as the maintenance line by @maxisbey in https://github.com/modelcontextprotocol/python-sdk/pull/3177


**Full Changelog**: https://github.com/modelcontextprotocol/python-sdk/compare/v1.28.1...v1.29.0