The Official Ruby SDK for MCP Reaches 1.0

Version 1.0.0 of the official Ruby SDK for the Model Context Protocol is now available. This is the first stable release of the mcp gem: the public API is now stable, and breaking changes ship only in major releases, following the Semantic Versioning policy documented in VERSIONING.md. Alongside the release, the Ruby SDK now meets every Tier 2 requirement of the SDK tiering system, as recorded in the Tier 2 assessment, and development toward Tier 1 is ongoing. ...

July 27, 2026 · 2 min · Koichi Ito (Ruby SDK Maintainer)