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ruby-sdk

MCP server · GitHub · ★ 940 · graded 2026-10-23Source linked

The official Ruby SDK for the Model Context Protocol servers and clients.

No outside reports on file

This SDK is safe as a library, but servers you build with it need careful controls over what data and actions the AI can actually reach.

Based on public adoption and transparency signals as of Oct 23, 2026. Our opinion, not a code audit or security guarantee.

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What it can access

  • Local filesNo local folder access notedLOW
  • Command executionNo shell command runner notedLOW
  • Network reachConnects to outside service APINOTED
  • CredentialsRequires API key or tokenREVIEW
  • Package sourceGitHub (modelcontextprotocol/ruby-sdk)PUBLIC

Inferred from this listing’s public package details and description. Check the project’s source before installing.

Install

No npm or PyPI package is listed. Install from source: github.com/modelcontextprotocol/ruby-sdk ↗

All setup options ↓

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About Ruby Sdk

This is an official Ruby library that lets developers build servers and clients that follow the Model Context Protocol (MCP) standard. It handles the communication format and structure so you can connect AI assistants to your Ruby applications and data sources.

Who it’s for

Ruby developers who want to create MCP servers to integrate custom tools, data, or services with Claude or other AI systems. It's for people building AI integrations in Ruby projects.

Alternatives

  • Python MCP SDK: The official Python version for building MCP servers in Python projects.
  • Node.js MCP SDK: The official JavaScript/TypeScript version for Node.js environments.
  • FastMCP: A Python framework that simplifies building MCP servers with decorators.

Setup

Check these steps against the project’s own instructions before running anything.

Follow the project's README at https://github.com/modelcontextprotocol/ruby-sdk (opens external site) for installation instructions. The README will show you how to add it to your Ruby project and start building servers.

Why this grade

CC — Moderate risk signals

Signal-based grade (3/7 points): well starred on GitHub, public source code. This reflects adoption and transparency, not a code review.

Popularity and upkeep

32/100
GitHub stars
940
Listing last refreshed
2026-10-29

These are public popularity signals, not a maintenance check. Look at the repository’s commit history and open issues.

Security reports

No reports found for this package in our research (last checked 2026-10-29).

Check a specific version →

Risks to watch for

  • Direct data access: A server built with this SDK can reach any databases, files, or APIs your Ruby process has permission to access, potentially exposing sensitive information to the AI.
  • Prompt injection: Attackers could craft clever prompts that trick your AI into misusing the tools this SDK exposes, causing unintended data access or changes.
  • Malicious dependencies: Ruby packages used by this SDK could contain hidden code that steals credentials or system information.
  • Unfiltered tool exposure: Tools you connect through this SDK might perform actions without proper validation, letting the AI modify or delete data unexpectedly.

How to lower the risk

Least-privilege permissions

  • Run the MCP server with only the database and file permissions it actually needs.
  • Create separate database accounts for the AI with read-only access where possible.

Network isolation

  • Keep the MCP server on an internal network, not exposed to the internet.
  • Use firewalls to limit what systems it can contact.

Monitoring

  • Log all requests the AI makes through your MCP server and review them regularly.
  • Set up alerts for unusual data access patterns or failed tool calls.

Red flags to watch for

  • Prompts that try to get the AI to ignore safety instructions or access restricted tools.
  • Unexpected connections to external services or unfamiliar data sources.

Questions

How do I install Ruby Sdk?

Ruby Sdk does not publish a standalone npm or PyPI package. Clone or follow the setup instructions in its source repository at github.com/modelcontextprotocol/ruby-sdk.

Are there security reports about Ruby Sdk?

No reports found for this package in our research (last checked 2026-10-29). Ruby Sdk currently holds Grade C (Moderate risk signals) based on public adoption and transparency signals. Key risk areas to watch include direct data access, prompt injection, malicious dependencies.

Is Ruby Sdk actively maintained?

Ruby Sdk has 940 GitHub stars. Our directory data was last refreshed on 2026-10-29. Check recent commit activity, release tags, and open issues at github.com/modelcontextprotocol/ruby-sdk before pinning it in production.

What are alternatives to Ruby Sdk?

Notable alternatives to Ruby Sdk include Python MCP SDK (The official Python version for building MCP servers in Python projects), Node.js MCP SDK (The official JavaScript/TypeScript version for Node.js environments), FastMCP (A Python framework that simplifies building MCP servers with decorators). You can also compare Ruby Sdk side by side with other MCP servers in the Related tools section on this page.

README badge and team notes

Maintain or use Ruby Sdk? Show its live grade in your GitHub README, docs site, or run a check from the terminal before you install.

AgentArmorHQ Risk Grade C for Ruby Sdk

GitHub README Markdown:

markdown
[![AgentArmorHQ Risk Grade for Ruby Sdk](https://agentarmorhq.com/api/badge/modelcontextprotocol-ruby-sdk)](https://agentarmorhq.com/skills/modelcontextprotocol-ruby-sdk)

HTML embed:

html
<a href="https://agentarmorhq.com/skills/modelcontextprotocol-ruby-sdk"><img src="https://agentarmorhq.com/api/badge/modelcontextprotocol-ruby-sdk" alt="AgentArmorHQ Risk Grade for Ruby Sdk" height="20" /></a>

Terminal check:

terminal
curl -fsSL https://agentarmorhq.com/api/cli | node --input-type=module - check "modelcontextprotocol-ruby-sdk"

Share with your security lead

Need sign-off to use ruby-sdk? Copy this note for Slack, a ticket or a pull request.

### AgentArmorHQ Security Review Memo: ruby-sdk
- **Listing URL:** https://agentarmorhq.com/skills/modelcontextprotocol-ruby-sdk
- **Type:** App connector
- **Risk Grade:** Grade C (Moderate risk signals)
- **Outside Security Advisories on File:** 0
- **Public Adoption:** 940 GitHub stars

#### Permission & Blast-Radius Signals
- **Local files:** No local folder access noted
- **Command execution:** No shell command runner noted
- **Network reach:** Connects to outside service API
- **Credentials:** Requires API key or token
- **Package source:** GitHub (modelcontextprotocol/ruby-sdk)

#### Recommended Hardened Setup
- **Source Repo:** https://github.com/modelcontextprotocol/ruby-sdk
- **Controls:** Pin an exact version in `.mcp.json`, scope access to a single workspace folder, and use a least-privilege read-only token where supported.

_Based on public adoption and transparency signals as of Oct 23, 2026. Our opinion, not a code audit or security guarantee._

Key facts

Type
App connector
Publisher
modelcontextprotocol
Source code
github.com/modelcontextprotocol/ruby-sdk
Est. context load
~700 tokens / turn (~4 tool schemas, 0.35% of 200k context)
Popularity
940 GitHub stars
Last updated
2026-10-29
Last graded
2026-10-23

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