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Ruby client for the Model Context Protocol (MCP). Latin: one who takes in hand.
28 starsRuby
Manceps – Ruby Client for the Model Context Protocol (MCP)
by obiefernandez·Apr 7, 2026·1 point·0 comments
AI Analysis
●●SolidNiche GemShip It
Ruby MCP client with httpx persistence when other options break persistent connections.
Strengths
- •httpx-backed Streamable HTTP transport handles MCP's session-to-connection binding correctly
- •Framework-agnostic design avoids coupling to specific LLM SDKs like LangChain
- •Experimental OAuth 2.1 with PKCE and automatic token refresh already implemented
Weaknesses
- •Ruby >= 3.4 requirement excludes many production apps still on 3.1 or 3.2
- •OAuth flow untested against diverse authorization servers beyond the author's setup
Category
Target Audience
Ruby developers building MCP integrations
Similar To
MCP TypeScript SDK · FastMCP
Post Description
I built this because existing Ruby options for MCP either don't handle persistent connections properly (MCP servers bind sessions to TCP connections) or couple you to a specific LLM framework.
Manceps is a pure protocol client. Two transports (Streamable HTTP and stdio), built-in auth (bearer, API key, experimental OAuth 2.1 with PKCE), and full 2025-11-25 spec support including protocol negotiation, elicitation, structured output, and notifications.
It uses httpx under the hood for connection persistence. No LLM opinions -- just MCP.
Ruby >= 3.4, MIT licensed.
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