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Title: [v1.x] Support Python 3.14 by maxisbey · Pull Request #2769 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: [v1.x] Support Python 3.14 by maxisbey · Pull Request #2769 · modelcontextprotocol/python-sdk

X Title: [v1.x] Support Python 3.14 by maxisbey · Pull Request #2769 · modelcontextprotocol/python-sdk

Description: Adds the Programming Language :: Python :: 3.14 trove classifier, adds 3.14 to the v1.x CI test matrix, and makes the dependency floors installable there. Backports #1834 from main. References #2537. Motivation and Context The README's supported-Python-versions badge (img.shields.io/pypi/pyversions/mcp.svg) renders the classifiers of the latest PyPI release, which currently stop at 3.13 — so the badge says 3.10–3.13 even though the SDK installs and works on 3.14. #2537 asked for the classifier on the v1 line; this adds it together with the CI coverage that makes the claim tested. The badge updates automatically once the next v1.x release is published with this classifier — no README edits needed. The dependency changes are the minimal set needed for the lowest-direct lane to install on 3.14, marker-gated so floors for <3.14 are unchanged: pydantic>=2.12.0 on 3.14 only — 2.11.x pins pydantic-core 2.33.0, which has no cp314 wheels (the existing <3.0.0 cap is kept on both branches) starlette>=0.48.0 on 3.14 only — first release supporting 3.14 pywin32>=311 on 3.14 only — 310 ships no cp314 wheels mkdocs-material[imaging]>=9.5.45 → >=9.6.19 — 9.5.45's imaging extra pins pillow~=10.2, which has no cp314 wheels and fails to install on the 3.14 lowest-direct lane; 9.6.19 allows pillow 11.x. Dependency groups aren't published metadata, so this doesn't affect package consumers (the lockfile already pins 9.6.19). Code changes are the coverage workarounds from #1834 (coverage.py branch misreporting on 3.14, coveragepy/coveragepy#1987) plus one # pragma: no branch for a nested-async-with arc in test_sse_security.py that only 3.14 flags. No runtime changes were needed — same as on main. Deliberately not carried over from #1834: the coverage>=7.13.1 bump (reverted on main by #1897; ==7.10.7 has cp314 wheels and passes), the mkdocstrings-python major bump (1.12.2 installs fine on 3.14), and the pillow dev-dependency (supplied transitively via the imaging extra). How Has This Been Tested? Ran the CI lanes locally with the exact shared.yml commands (uv sync --upgrade --resolution {lowest-direct,highest} --all-extras --python , then coverage run/combine/report): 3.14 × lowest-direct: 1122 passed, 100.00% coverage (resolves pydantic 2.12.0, starlette 0.48.0, coverage 7.10.7, pillow 11.3.0) 3.14 × highest: 1122 passed, 100.00% 3.10 × lowest-direct and 3.13 × highest: 1122 passed, 100.00% (no regression from the marker splits or pragmas) Docs build from the updated lockfile (uv sync --frozen --group docs && mkdocs build) Full pre-commit suite including uv lock --check Built the package and verified the wheel METADATA carries Classifier: Programming Language :: Python :: 3.14 All four 3.14 CI lanes (lowest-direct/highest × ubuntu/windows) passed at the job level on this PR's earlier run. Since the test job is continue-on-error, reviewers should check the 3.14 job conclusions directly rather than relying on the green check. Breaking Changes None. Floors for Python <3.14 are unchanged; the lockfile gains a resolution fork at 3.14. Types of changes New feature (non-breaking change which adds functionality) Checklist I have read the MCP Documentation My code follows the repository's style guidelines New and existing tests pass locally I have added appropriate error handling I have added or updated documentation as needed Additional context On the 3.14 fork, pydantic 2.12.0 transitively requires typing-extensions>=4.14.1, so the advertised typing-extensions 4.9.0 floor is only exercised on ≤3.13 — same situation as main at #1834. The badge has shown 3.10–3.13 since 3.14.0 was released (2025-10); cutting a release (e.g. v1.27.3) after this merges makes the badge update automatically. AI Disclaimer

Open Graph Description: Adds the Programming Language :: Python :: 3.14 trove classifier, adds 3.14 to the v1.x CI test matrix, and makes the dependency floors installable there. Backports #1834 from main. References #253...

X Description: Adds the Programming Language :: Python :: 3.14 trove classifier, adds 3.14 to the v1.x CI test matrix, and makes the dependency floors installable there. Backports #1834 from main. References #253...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2769

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