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title: The Official Ruby SDK for MCP Reaches Tier 1 | daily.dev
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# The Official Ruby SDK for MCP Reaches Tier 1

**[Model Context Protocol](https://daily.dev/sources/modelcontextprotocol-blog)** · 4 min read · 0 upvotes · 0 comments

## Summary

The official Ruby SDK for the Model Context Protocol has reached Tier 1 status, becoming the sixth Tier 1 SDK alongside TypeScript, Python, C#, Go, and Rust. Version 1.2.0 of the mcp gem completes support for the 2026-07-28 spec revision, and the SDK passes 100% of scored conformance scenarios: 67/67 server runs and 50/50 client runs. The SDK went from Tier 3 in March 2026 to Tier 2 in July to Tier 1 in September. The team has committed to supporting the next spec revision, scheduled for 2026-12-15, by its release date. The latest release is v1.6.1.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://blog.modelcontextprotocol.io/posts/ruby-sdk-tier-1>

## Questions this post answers

### Which SDKs have reached Tier 1 status for the Model Context Protocol?

Six SDKs have reached Tier 1: TypeScript, Python, C#, Go, Rust, and now Ruby. Tier 1 requires full feature support for the current spec revision, a 100% conformance pass rate on the conformance suite, and a maintenance commitment with defined issue response times.

_Track which MCP SDKs hit full conformance before picking one for your stack on daily.dev._

### What does the Ruby mcp gem version 1.2.0 add for MCP spec support?

Version 1.2.0 of the mcp gem completes support for the 2026-07-28 protocol revision, including the stateless lifecycle (SEP-2575) served alongside the classic session handshake, multi round-trip requests (SEP-2322) on both server and client, cache hints (SEP-2549), custom HTTP headers (SEP-2243), and deprecation warnings for Roots, Sampling, and Logging capabilities per SEP-2577.

_Developers upgrading MCP servers track spec-revision support like this on daily.dev before touching production code._

### How do I install or upgrade the Ruby MCP SDK gem?

Run 'gem install mcp' to install it, or if a Gemfile pins a 0.x version, update the constraint to 'gem "mcp", ">= 1.6"' or 'gem "mcp", "~> 1.6"' to stay within the 1.x series. The latest release at time of writing is v1.6.1, and upgrading an existing 1.x server lets it serve 2026-07-28 clients alongside older ones.

_Ruby developers wiring up MCP servers keep gem upgrade paths like this handy on daily.dev._

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---

Tags: [#ruby](https://daily.dev/tags/ruby), [#mcp](https://daily.dev/tags/mcp)

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