The wire types for the Model Context Protocol.

This package holds the protocol message models, JSON-RPC envelope types, per-version surface validators, and the protocol-version registry. Its only runtime dependencies are pydantic and typing-extensions, so it can be installed on its own when you need to (de)serialize MCP traffic without pulling in the full mcp SDK.

from mcp_types import Tool, CallToolRequest
from mcp_types.version import LATEST_PROTOCOL_VERSION

The mcp package re-exports these names, so existing from mcp import Tool imports keep working.