Shared optional fields carried by every content kind in the MCP schema:
an _meta object and annotations (audience/priority/lastModified). Mixed
into each per-kind content struct so the fields live exactly once, with no
per-kind duplication or "meaningless on this kind" footgun.
Shared optional fields carried by every content kind in the MCP schema: an _meta object and annotations (audience/priority/lastModified). Mixed into each per-kind content struct so the fields live exactly once, with no per-kind duplication or "meaningless on this kind" footgun.