modelcontextprotocol/typescript-sdk

The Model Context Protocol (MCP) TypeScript SDK is the cornerstone of a major industry shift toward standardized AI integration. Developed by Anthropic, it solves the 'n-to-m' integration problem where every AI app needs a custom connector for every data source. With over 12,000 stars and nearly 1,800 forks, it has achieved massive adoption velocity, becoming the de facto standard for building 'tools' that Claude, Cursor, and other IDEs/agents can consume. Its defensibility is high not because the code is impossible to replicate, but because of its status as the official reference implementation of a protocol with strong network effects. Every new MCP server built increases the value of the ecosystem. While frontier labs like OpenAI or Google could theoretically launch a competing protocol, Anthropic has moved first to build an open ecosystem, and the 'Frontier Risk' is low because these labs are the primary sponsors/users of the protocol rather than competitors to the SDK itself. Platform domination risk is high because Anthropic effectively controls the specification's evolution. However, for a developer, this is an infrastructure-grade project with high switching costs once an ecosystem of connectors is established. The primary threat would be a sudden pivot by Microsoft or OpenAI toward a different, incompatible standard, but currently, major players like Sourcegraph and various IDE builders are aligning around MCP.