Implementation

Identifies an MCP implementation (client or server).

Per the schema Implementation extends BaseMetadata (name/title) and the Icons mixin, adding version plus the optional description, websiteUrl, and icons fields (description/icons/websiteUrl apply from 2025-11-25). All optional fields are omitted from toJson when unset, so wire output stays valid for older protocol versions.

@safe

struct Implementation {

string name;

string version_;

Nullable!string title;

Nullable!string description;

Nullable!string websiteUrl;

Icon[] icons;

Implementation forVersion(ProtocolVersion v);

}

Members

Functions

forVersion Implementation forVersion(ProtocolVersion v): Return a copy of this Implementation with any fields newer than the negotiated protocol version stripped, so the wire output stays valid for the peer's version. title applies from 2025-06-18 (BaseMetadata); description, websiteUrl, and icons apply from 2025-11-25. name/version are always present. This lets a server (or client) hold a fully-populated identity while emitting only the fields its peer understands.

Variables

description Nullable!string description;: optional human-readable description (>= 2025-11-25)
icons Icon[] icons;: optional icons for display in user interfaces (>= 2025-11-25)
title Nullable!string title;: human-friendly display name (>= 2025-06-18)
version_ string version_;: serialized as "version"
websiteUrl Nullable!string websiteUrl;: optional website URL (>= 2025-11-25)

mcp protocol capabilities enums

ClientCapability

structs

variables

tasksExtensionKey