VectorMCP MCP Server

A server implementation for the Model Context Protocol (MCP) in Ruby.

What the server does

VectorMCP is a Ruby implementation of the Model Context Protocol (MCP) server-side specification. It gives you a framework for exposing tools, resources, prompts, roots, sampling, middleware, and security over the MCP streamable HTTP transport.

• Streamable HTTP is the built-in transport, with session management, resumability, and MCP the publisher’s release record compliance
• Class-based tools via VectorMCP::Tool, plus the original block-based register_tool API
• Rack and Rails mounting through server.rack_app
• Opt-in authentication and authorization, structured logging, and middleware hooks
• Request-scoped identity: every request is dispatched through its own invocation, so concurrent requests on one session can never observe each other's headers or auth
• Image-aware tools/resources/prompts, roots, and server-initiated sampling

Credentials and setup notes

• Ruby 3.2+

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Maintainer setup documentation.