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MCP · Building servers and clients · all subjects

registry & publication

5 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

MCP ecosystem growth statistics

As of November 2025, the MCP Registry launched in September has close to two thousand entries, representing 407% growth from the initial batch of servers onboarded that same month. The specification release mentions 58 maintainers supporting 9 core/lead maintainers in the steering group, with 2,900+ contributors in the contributor community on Discord, and 100+ new contributors joining every week.

MCP community governance structure and SEPs

MCP uses Specification Enhancement Proposals (SEPs) for community-driven protocol improvements. The governance structure includes Working and Interest Groups established through formal proposals. As of the November 2025 release, the community managed to collaborate through 17 SEPs in about a quarter's worth of time.

Official SDK languages and tiers

The Model Context Protocol provides official SDKs in the following languages with their tier classifications: TypeScript (Tier 1), Python (Tier 1), C# (Tier 1), Go (Tier 1), Rust (Tier 1), Java (Tier 2), Ruby (Tier 2), Swift (Tier 3), PHP (Tier 3), and Kotlin (Tier 3). SDK tiers are based on feature completeness, protocol support, and maintenance commitment.

Swift SDK repository location

The official Swift SDK for MCP is located in the repository modelcontextprotocol/swift-sdk and is classified as Tier 3.

PHP SDK documentation

The official PHP SDK for MCP is located at https://php.sdk.modelcontextprotocol.io with the repository at modelcontextprotocol/php-sdk and is classified as Tier 3.

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