MCP TypeScript SDK becomes the default client and server kit

Official SDK cadence is a leading indicator of paid-MCP readiness.

The modelcontextprotocol/typescript-sdk repository is the maintained TypeScript implementation of MCP clients and servers. Release tags are TIER_B maintainer evidence of protocol evolution. Paid MCP is not specified by the core SDK; it is an overlay that payment rails must attach.

Why it matters

Tool servers ship faster than payment overlays. That gap is a product opportunity and a support-load predictor.

Source: MCP TypeScript SDK

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