- Add skill tool types: SkillArgs, SkillInfo, SkillLoadOptions interfaces
- Implement createSkillTool() factory function with configurable discovery options
- Add parseSkillInfo() helper to convert LoadedSkill to user-facing SkillInfo format
- Add formatSkillsXml() helper to generate available skills XML for tool description
- Support opencodeOnly option to filter Claude Code paths from discovery
- Tool loads and parses skill frontmatter, returns skill content with base directory
- Export skill tool singleton instance for default usage
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