Capability
Notification System For Asynchronous Server To Client Events
7 artifacts provide this capability.
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via “event subscription and notification handling”
mcp-ui Client SDK
Unique: Implements event subscription as a first-class API rather than layering on top of polling, enabling efficient server-to-client communication patterns native to MCP protocol
vs others: More efficient than polling because it uses server-initiated notifications, reducing latency and server load compared to client-side polling loops