Module server 

MCP server core — tool registration, initialization, and dispatch logic.

Structs

McpServer

An MCP server that manages tools, resources, prompts, and dispatches calls.

Constants

LATEST_PROTOCOL_VERSION

The newest MCP protocol revision this server implements (modern, stateless).

LEGACY_LATEST_PROTOCOL_VERSION

The newest legacy (initialize-handshake) revision this server implements.

LEGACY_PROTOCOL_VERSIONS

The legacy (initialize-handshake) revisions this server implements, newest first — SUPPORTED_PROTOCOL_VERSIONS minus its modern head. The initialize handshake negotiates among these only.

META_PROTOCOL_VERSION

The _meta key carrying a modern request’s protocol version.

META_SERVER_INFO

The _meta key carrying the server identity in results (server/discover).

META_SUBSCRIPTION_ID

The _meta key tagging subscription-stream messages with the JSON-RPC id of the subscriptions/listen request that opened them.

SUPPORTED_PROTOCOL_VERSIONS

MCP protocol versions this server understands, newest first.

Traits

AsyncToolHandler

Async tool-handler trait — the async counterpart to the synchronous Handler.

Functions

request_protocol_version

Extract the modern-era protocol version from a request’s params._meta, if present. None means the request speaks legacy.

Type Aliases

Handler

Handler function type for MCP tool calls (synchronous).