Release 0.16.0

New features and changes have landed, making it a good time to cut a release.
Further feature proposals can be incorporated in future releases.

Author: koic

CHANGELOG.md

@@ -7,6 +7,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.16.0] - 2026-05-14
+
+### Added
+
+- Add opt-in tool output validation (#344)
+
+### Changed
+
+- Advertise JSON Schema 2020-12 dialect on emitted tool schemas (#342)
+
+### Fixed
+
+- Preserve client tool output schemas (#343)
+- Fix missing `output_schema` argument in `define_tool` API (#301)
+
 ## [0.15.0] - 2026-05-05
 
 ### Added

lib/mcp/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module MCP
-  VERSION = "0.15.0"
+  VERSION = "0.16.0"
 end