- Add outputSchema field to Tool type and RegisteredTool interface
- Make content field optional in CallToolResult
- Update ListToolsRequestSchema handler to include outputSchema in tool list responses
- Add support for structuredContent in tool results
- Update examples to handle optional content field
- Add tests for new outputSchema and structuredContent functionality
- Update ToolCallback documentation to clarify when to use structuredContent vs content

This change enables tools to define structured output schemas and return
structured JSON content, providing better type safety and validation for
tool outputs.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

- Cache tool output schemas when listing tools
- Validate structuredContent against outputSchema during callTool
- Enforce that tools with outputSchema must return structuredContent
- Add json-schema-to-zod dependency for schema conversion
- Add comprehensive tests for validation scenarios

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

…tured tool output

- Add outputSchema support to Tool interface with proper documentation
- Split CallToolResult into structured and unstructured variants
- Change structuredContent from string to object type
- Add validation that tools without outputSchema cannot return structuredContent
- Add validation that tools with outputSchema must return structuredContent
- Update client to validate structured content as object (no JSON parsing)
- Update tests to use object format for structuredContent
- Add tests for new validation constraints
- Update LATEST_PROTOCOL_VERSION to DRAFT-2025-v2

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

…patibility

- Update McpServer to support registering tools with outputSchema
- Add automatic content generation from structuredContent for backward compatibility
- Add validation to ensure proper usage of structuredContent vs content
- Add comprehensive tests for outputSchema functionality
- Add example servers demonstrating structured output usage
- Update existing test to match new backward compatibility behavior

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>