Tools
MCP's Skills extension is Final and published as an official extension
modelcontextprotocol PR #3372 (merged 2026-09-18 10:55 UTC) updates the spec docs because SEP-2640 is now Final and the official Skills extension is published; the SEP merged September 13 and Skills conformance scenarios merged September 11. The extension lives at modelcontextprotocol/ext-skills (627 stars, pushed today) and distributes skills through MCP Resources primitives. The docs explicitly separate publication from adoption: the Go, Python, TypeScript and C# SDK implementation PRs are still open, so nothing speaks it end to end yet.
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