feat: deprecate roots, sampling, and logging for 2026-07-28#406
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Warn when Roots, Sampling, or Logging APIs are used with MCP protocol version 2026-07-28, while leaving the latest stable default at 2025-11-25. Add a shared protocol deprecation helper, YARD deprecation notes, and regression tests covering warnings for 2026-07-28 and no warnings for older protocol versions. Closes modelcontextprotocol#390
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TL;DR
Deprecate MCP Roots, Sampling, and Logging only when protocol version
2026-07-28is negotiated or explicitly configured.Context
SEP-2577 deprecates Roots, Sampling, and Logging in the
2026-07-28protocol version.Closes #390
Changes
2026-07-28as an explicitly supported stable protocol version while keepingLATEST_STABLE_PROTOCOL_VERSIONat2025-11-25.Kernel.warnmessages only for2026-07-28.2026-07-28.@deprecatednotes and regression tests for both warning and no-warning behavior.Testing
GEM_HOME="$PWD/.gem-test" GEM_PATH="$PWD/.gem-test:/nix/store/jh918yiwd5cs4pjg005ac32m2q7ckw3l-ruby-4.0.5/lib/ruby/gems/4.0.0" bundle exec rake testGEM_HOME="$PWD/.gem-test" GEM_PATH="$PWD/.gem-test:/nix/store/jh918yiwd5cs4pjg005ac32m2q7ckw3l-ruby-4.0.5/lib/ruby/gems/4.0.0" bundle exec rake rubocopgit diff --check