See Agent tool definition format for the compact in-repository source schema reference.
[^1]: Model Context Protocol documentation: https://modelcontextprotocol.io/docs/getting-started/intro.
[^2]: Model Context Protocol specification repository: https://github.com/modelcontextprotocol/modelcontextprotocol.
[^3]: Anthropic Agent Skills documentation: https://platform.claude.com/docs/en/agents-and-tools/agent-skills/overview.