Add $defs support in ToolSchema and update tests.
Motivation and Context
Fix parsing when tool schemas include $defs.
How Has This Been Tested?
`./gradlew :kotlin-sdk-core:jvmTest --tests
"io.modelcontextprotocol.kotlin.sdk.types.ToolsTest"`
Breaking Changes
No.
Types of changes
- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
Checklist
- [x] I have read the MCP Documentation
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed
Additional context
N/A
(cherry picked from commit 1b255a2baf)
6969176e6c