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Title: Deprecate roots, sampling, and logging methods per SEP-2577 by Kludex · Pull Request #2926 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Deprecate roots, sampling, and logging methods per SEP-2577 by Kludex · Pull Request #2926 · modelcontextprotocol/python-sdk

X Title: Deprecate roots, sampling, and logging methods per SEP-2577 by Kludex · Pull Request #2926 · modelcontextprotocol/python-sdk

Description: Implements SEP-2577 for the 2026-07-28 spec (tracked in #2805). Summary The deprecation is advisory only - no wire-level changes, capability negotiation is unchanged, and every method keeps working for sessions negotiating 2025-11-25 and earlier. This PR scopes the deprecation to the user-facing methods for Roots/Sampling/Logging, so users get a signal at their own call sites, without decorating every schema type and capability field (which would have required ~450 internal # pyright: ignore suppressions across the SDK that builds those types to serve older sessions). Methods marked with typing_extensions.deprecated: Sampling: ServerSession.create_message(), ClientPeer.sample() Roots: ServerSession.list_roots(), ClientPeer.list_roots(), ClientSession.send_roots_list_changed(), Client.send_roots_list_changed() Logging: ServerSession.send_log_message(), ClientSession.set_logging_level(), Client.set_logging_level(), and the MCPServer Context helpers log() / debug() / info() / warning() / error() Type checkers, IDEs, and the runtime now warn where these are called. Keeping the build green A scoped filterwarnings entry in pyproject.toml silences the advisory runtime DeprecationWarning, since the SDK calls these methods internally (e.g. ctx.debug -> log -> send_log_message). Internal/test/example call sites carry # pyright: ignore[reportDeprecated]. Added a pytest.warns test asserting the deprecation fires, and a migration-guide entry. Conformance SEP-2577 is advisory only with no observable wire behavior, so there is nothing for the conformance suite to assert. AI Disclaimer This PR was developed with the assistance of either Claude or Codex. I've reviewed and verified the changes.

Open Graph Description: Implements SEP-2577 for the 2026-07-28 spec (tracked in #2805). Summary The deprecation is advisory only - no wire-level changes, capability negotiation is unchanged, and every method keeps working...

X Description: Implements SEP-2577 for the 2026-07-28 spec (tracked in #2805). Summary The deprecation is advisory only - no wire-level changes, capability negotiation is unchanged, and every method keeps working...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2926

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Deprecate roots, sampling, and logging methods per SEP-2577 https://github.com/modelcontextprotocol/python-sdk/pull/2926/files#top
Show all changes 7 commits https://github.com/modelcontextprotocol/python-sdk/pull/2926/files
86bd4f3 Deprecate roots, sampling, and logging methods per SEP-2577 Kludex Jun 20, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2926/commits/86bd4f34088154056e2b240fb02368a47e4f111f
a5c1522 Emit deprecation warnings as a visible MCPDeprecationWarning Kludex Jun 20, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2926/commits/a5c1522cac46a7e3a1d1c753e751a8395aa8768c
a465678 Deprecate only `Context.log` for logging, with a capability-level mes… Kludex Jun 20, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2926/commits/a465678c42d79a920692c46d99789540e1c3e60c
8cfdd44 Restructure list_roots deprecation test to cover its branches on 3.14 Kludex Jun 20, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2926/commits/8cfdd44010e1ff1c888f52cb64b5f55dab8ff2ae
7ee2e0d Deprecate Connection.log for consistency with the logging capability Kludex Jun 20, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2926/commits/7ee2e0d362b650092ecc6b8f425e54e2f94cfbdd
24cb7b0 List the lowlevel Context.log in the SEP-2577 deprecation note Kludex Jun 20, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2926/commits/24cb7b086e282b13f7cf07e2da547aae9d189f45
b304131 Use capability-level deprecation messages for roots and sampling Kludex Jun 20, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2926/commits/b3041311d6c810bbf51cb0c5a4e76a49c3628576
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