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Canonical AI event

Model Context Protocol Server 2.2.0 Fixes Unhandled Promise Rejection on Closed Connections

The Model Context Protocol server version 2.2.0 fixes a stack overflow issue in the createMcpHandler function.

28 Sept 20261 verified claims1 sources1 observations
What happened

The official source reports this update: @modelcontextprotocol/server@2.2.0. Patch Changes #2885 9dd722f Thanks @claude ! - Sending a notification on a closed connection no longer produces a briefly unhandled promise rejection (seen as unhandledrejection on Cloudflare Workers) in addition to the returned rejection. #2778 e3fb9ed Thanks @vjymisal0 ! - Fix a stack overflow in createMcpHandler when the factory returns the same server instance for more than one request. Returning a fresh instance per request is still required. #2651 c55efa6 Thanks @sushantkumar23 !

Why it matters

This official update documents a development concerning @modelcontextprotocol/server@2.2.0. Its practical significance depends on the scope and evidence stated by the source.

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Read the official source update and verify its stated scope, evidence and timing before acting on it.

Connected knowledge

Entities affected by this event

Typescript Sdksubject
Continue this topic
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Evidence trail

Sources behind the event

Model Context Protocol TypeScript SDK official releases@modelcontextprotocol/server@2.2.0
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