A low-level Model-Context-Protocol implementation for Ruby. Supports prompts and completions.
server = RubyMCP::Server.new server.add_prompt( name: "ruby_example", description: "Example usage of a method", arguments: [ { name: "snippet", description: "small ruby snippet", required: true, completions: ->(*) { [ 'String#split', 'Array#join', 'tally', 'unpack' ] } } ], result: ->(snippet:) { { description: "Explain '#{snippet}'", messages: [ { role: "user", content: { type: "text", text: <<~TXT You're a coding assistant in the editor zed. You give one practical example for the given ruby method. Only answer with a single code snippet and one line of explanation. For example: INPUT: '''String#split''' OUTPUT: 'abc'.split('') # ['a', 'b', 'c']\n Splits the string" TXT } }, { role: "user", content: { type: "text", text: "INPUT: '''#{snippet}'''" } } ] } }, ) transport = RubyMCP::Transport::Stdio.new server.connect(transport)RubyMCP supports mcp logging. Each logging level has a corresponding method prefixed with send_ and suffixed with _log_message.
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Debug Level:
server.send_debug_log_message({ text: "Debug information" })
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Info Level:
server.send_info_log_message({ text: "Informational message" })
A MCP client can configure change the log severity or it can be set during server creation. The default is "info".
server = Server.new(logging_verbosity: "debug")