Annotations

Optional annotations attached to resources, resource templates, and content blocks, per the MCP spec's Annotations shape. All fields are optional and advisory; a field left unset is omitted from the serialized form.

- audience: who the object is intended for (e.g. ["user"], ["assistant"]). - priority: importance from 0.0 (least) to 1.0 (most). - lastModified: ISO 8601 timestamp of last modification.

@safe

struct Annotations {

string[] audience;

Nullable!double priority;

Nullable!string lastModified;

bool empty();

Annotations forVersion(ProtocolVersion v);

}

Members

Functions

empty bool empty(): True if no annotation is set (serializes to an empty object).
forVersion Annotations forVersion(ProtocolVersion v): Return a copy projected for the negotiated protocol version. audience and priority existed in 2024-11-05, so they are kept for every version; Annotations.lastModified was introduced in 2025-06-18, so it is stripped for any earlier peer to keep the wire output in-schema.

Variables

audience string[] audience;: intended audience, e.g. ["user", "assistant"]
lastModified Nullable!string lastModified;: ISO 8601 last-modified timestamp
priority Nullable!double priority;: importance 0.0..1.0