Class: Raix::MCP::StdioClient

Inherits:
Object
  • Object
show all
Defined in:
lib/raix/mcp/stdio_client.rb

Overview

Client for communicating with MCP servers via stdio using JSON-RPC.

Instance Method Summary collapse

Constructor Details

#initialize(*args, env) ⇒ StdioClient

Creates a new client with a bidirectional pipe to the MCP server.



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# File 'lib/raix/mcp/stdio_client.rb', line 10

def initialize(*args, env)
  @args = args
  @io = IO.popen(env, args, "w+")
end

Instance Method Details

#call_tool(name, **arguments) ⇒ Object

Executes a tool with given arguments. Returns text content directly, or JSON-encoded data for other content types.



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# File 'lib/raix/mcp/stdio_client.rb', line 26

def call_tool(name, **arguments)
  result = call("tools/call", name:, arguments:)
  content = result["content"]
  return "" if content.nil? || content.empty?

  # Handle different content formats
  first_item = content.first
  case first_item
  when Hash
    case first_item["type"]
    when "text"
      first_item["text"]
    when "image"
      # Return a structured response for images
      {
        type: "image",
        data: first_item["data"],
        mime_type: first_item["mimeType"] || "image/png"
      }.to_json
    else
      # For any other type, return the item as JSON
      first_item.to_json
    end
  else
    first_item.to_s
  end
end

#close ⇒ Object

Closes the connection to the server.



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# File 'lib/raix/mcp/stdio_client.rb', line 55

def close
  @io.close
end

#tools ⇒ Object

Returns available tools from the server.



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# File 'lib/raix/mcp/stdio_client.rb', line 16

def tools
  result = call("tools/list")

  result["tools"].map do |tool_json|
    Tool.from_json(tool_json)
  end
end

#unique_key ⇒ Object 



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# File 'lib/raix/mcp/stdio_client.rb', line 59

def unique_key
  parametrized_args = @args.join(" ").parameterize.underscore
  Digest::SHA256.hexdigest(parametrized_args)[0..2]
end