Reduce stdout hedge in examples

This PR reduces redundant stdout in examples by replacing
multiple `puts` with a heredoc and by removing unnecessary `puts`.

examples/http_client.rb

@@ -50,7 +50,7 @@ class MCPHTTPClient
       },
     })
     puts "Response: #{JSON.pretty_generate(result)}"
-    puts
+
     result
   end
 
@@ -58,7 +58,7 @@ class MCPHTTPClient
     puts "=== Sending ping ==="
     result = send_request("ping")
     puts "Response: #{JSON.pretty_generate(result)}"
-    puts
+
     result
   end
 
@@ -66,7 +66,7 @@ class MCPHTTPClient
     puts "=== Listing tools ==="
     result = send_request("tools/list")
     puts "Response: #{JSON.pretty_generate(result)}"
-    puts
+
     result
   end
 
@@ -77,7 +77,7 @@ class MCPHTTPClient
       arguments: arguments,
     })
     puts "Response: #{JSON.pretty_generate(result)}"
-    puts
+
     result
   end
 
@@ -85,7 +85,7 @@ class MCPHTTPClient
     puts "=== Listing prompts ==="
     result = send_request("prompts/list")
     puts "Response: #{JSON.pretty_generate(result)}"
-    puts
+
     result
   end
 
@@ -96,7 +96,7 @@ class MCPHTTPClient
       arguments: arguments,
     })
     puts "Response: #{JSON.pretty_generate(result)}"
-    puts
+
     result
   end
 
@@ -104,7 +104,7 @@ class MCPHTTPClient
     puts "=== Listing resources ==="
     result = send_request("resources/list")
     puts "Response: #{JSON.pretty_generate(result)}"
-    puts
+
     result
   end
 
@@ -114,7 +114,7 @@ class MCPHTTPClient
       uri: uri,
     })
     puts "Response: #{JSON.pretty_generate(result)}"
-    puts
+
     result
   end
 
@@ -131,7 +131,6 @@ class MCPHTTPClient
     response = http.request(request)
     result = JSON.parse(response.body)
     puts "Response: #{JSON.pretty_generate(result)}"
-    puts
 
     @session_id = nil
     result
@@ -140,10 +139,11 @@ end
 
 # Main script
 if __FILE__ == $PROGRAM_NAME
-  puts "MCP HTTP Client Example"
+  puts <<~MESSAGE
-  puts "Make sure the HTTP server is running (ruby examples/http_server.rb)"
+    MCP HTTP Client Example
-  puts "=" * 50
+    Make sure the HTTP server is running (ruby examples/http_server.rb)
-  puts
+    #{"=" * 50}
+  MESSAGE
 
   client = MCPHTTPClient.new
 

examples/http_server.rb

@@ -154,15 +154,17 @@ rack_app = Rack::Builder.new do
 end
 
 # Start the server
-puts "Starting MCP HTTP server on http://localhost:9292"
+puts <<~MESSAGE
-puts "Use POST requests to initialize and send JSON-RPC commands"
+  Starting MCP HTTP server on http://localhost:9292
-puts "Example initialization:"
+  Use POST requests to initialize and send JSON-RPC commands
-puts '  curl -i http://localhost:9292 --json \'{"jsonrpc":"2.0","method":"initialize","id":1,"params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}\''
+  Example initialization:
-puts ""
+    curl -i http://localhost:9292 --json '{"jsonrpc":"2.0","method":"initialize","id":1,"params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}'
-puts "The server will return a session ID in the Mcp-Session-Id header."
+
-puts "Use this session ID for subsequent requests."
+  The server will return a session ID in the Mcp-Session-Id header.
-puts ""
+  Use this session ID for subsequent requests.
-puts "Press Ctrl+C to stop the server"
+
+  Press Ctrl+C to stop the server
+MESSAGE
 
 # Run the server
 # Use Rackup to run the server

examples/streamable_http_client.rb

@@ -92,7 +92,6 @@ def main
   end
 
   puts "=== MCP SSE Test Client ==="
-  puts ""
 
   # Step 1: Initialize session
   logger.info("Initializing session...")
@@ -134,13 +133,16 @@ def main
 
   # Step 3: Interactive menu
   loop do
-    puts "\n=== Available Actions ==="
+    puts <<~MESSAGE.chomp
-    puts "1. Send custom notification"
+
-    puts "2. Test echo"
+      === Available Actions ===
-    puts "3. List tools"
+      1. Send custom notification
-    puts "0. Exit"
+      2. Test echo
-    puts ""
+      3. List tools
-    print("Choose an action: ")
+      0. Exit
+
+      Choose an action:#{" "}
+    MESSAGE
 
     choice = gets.chomp
 
@@ -167,19 +169,15 @@ def main
       else
         logger.error("Error: #{response[:body]["error"]}")
       end
-
     when "2"
       print("Enter message to echo: ")
       message = gets.chomp
       make_request(session_id, "tools/call", { name: "echo", arguments: { message: message } })
-
     when "3"
       make_request(session_id, "tools/list")
-
     when "0"
       logger.info("Exiting...")
       break
-
     else
       puts "Invalid choice"
     end

examples/streamable_http_server.rb

@@ -136,37 +136,38 @@ rack_app = Rack::Builder.new do
 end
 
 # Print usage instructions
-puts "=== MCP Streaming HTTP Test Server ==="
+puts <<~MESSAGE
-puts ""
+  === MCP Streaming HTTP Test Server ===
-puts "Starting server on http://localhost:9393"
+
-puts ""
+  Starting server on http://localhost:9393
-puts "Available Tools:"
+
-puts "1. NotificationTool - Returns messages that are sent via SSE when stream is active"
+  Available Tools:
-puts "2. echo - Simple echo tool"
+  1. NotificationTool - Returns messages that are sent via SSE when stream is active"
-puts ""
+  2. echo - Simple echo tool
-puts "Testing SSE:"
+
-puts ""
+  Testing SSE:
-puts "1. Initialize session:"
+
-puts "   curl -i http://localhost:9393 \\"
+  1. Initialize session:
-puts '     --json \'{"jsonrpc":"2.0","method":"initialize","id":1,"params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"sse-test","version":"1.0"}}}\''
+     curl -i http://localhost:9393 \\
-puts ""
+       --json '{"jsonrpc":"2.0","method":"initialize","id":1,"params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"sse-test","version":"1.0"}}}'
-puts "2. Connect SSE stream (use the session ID from step 1):"
+
-puts '   curl -i -N -H "Mcp-Session-Id: YOUR_SESSION_ID" http://localhost:9393'
+  2. Connect SSE stream (use the session ID from step 1):"
-puts ""
+     curl -i -N -H "Mcp-Session-Id: YOUR_SESSION_ID" http://localhost:9393
-puts "3. In another terminal, test tools (responses will be sent via SSE if stream is active):"
+
-puts ""
+  3. In another terminal, test tools (responses will be sent via SSE if stream is active):
-puts "   Echo tool:"
+
-puts '   curl -i http://localhost:9393 -H "Mcp-Session-Id: YOUR_SESSION_ID" \\'
+     Echo tool:
-puts '     --json \'{"jsonrpc":"2.0","method":"tools/call","id":2,"params":{"name":"echo","arguments":{"message":"Hello SSE!"}}}\''
+     curl -i http://localhost:9393 -H "Mcp-Session-Id: YOUR_SESSION_ID" \\
-puts ""
+       --json '{"jsonrpc":"2.0","method":"tools/call","id":2,"params":{"name":"echo","arguments":{"message":"Hello SSE!"}}}'
-puts "   Notification tool (with 2 second delay):"
+
-puts '   curl -i http://localhost:9393 -H "Mcp-Session-Id: YOUR_SESSION_ID" \\'
+     Notification tool (with 2 second delay):
-puts '     --json \'{"jsonrpc":"2.0","method":"tools/call","id":3,"params":{"name":"notification_tool","arguments":{"message":"Hello SSE!", "delay": 2}}}\''
+     curl -i http://localhost:9393 -H "Mcp-Session-Id: YOUR_SESSION_ID" \\
-puts ""
+       --json '{"jsonrpc":"2.0","method":"tools/call","id":3,"params":{"name":"notification_tool","arguments":{"message":"Hello SSE!", "delay": 2}}}'
-puts "Note: When an SSE stream is active, tool responses will appear in the SSE stream and the POST request will return {\"accepted\": true}"
+
-puts ""
+  Note: When an SSE stream is active, tool responses will appear in the SSE stream and the POST request will return {"accepted": true}
-puts "Press Ctrl+C to stop the server"
+
-puts ""
+  Press Ctrl+C to stop the server
+MESSAGE
 
 # Start the server
 Rackup::Handler.get("puma").run(rack_app, Port: 9393, Host: "localhost")