Update CHANGELOG update rules and ask Cursor to populate Unreleased

CHANGELOG.md

@@ -7,6 +7,23 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Custom methods support via `define_custom_method` (#75)
+- Streamable HTTP transport implementation (#33)
+- Tool argument validation against schemas (#43)
+
+### Changed
+
+- Server context is now optional for Tools and Prompts (#54)
+- Improved capability handling and removed automatic capability determination (#61, #63)
+- Refactored architecture in preparation for client support (#27)
+
+### Fixed
+
+- Input schema validation for schemas without required fields (#73)
+- Error handling when sending notifications (#70)
+
 ## [0.1.0] - 2025-05-30
 
 Initial release