diff --git a/CLAUDE.md b/CLAUDE.md
index 44415a91..809d4f16 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -53,17 +53,24 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 # Terminal 1: SSH Tunnel (keep open)
 ssh -L 5432:127.0.0.1:5432 kjh2064@178.104.200.7
 
-# Terminal 2: Start Host in DEVELOPMENT MODE (NOT Release)
+# Terminal 2: Start Host in DEVELOPMENT/LOCAL/TEST MODE
 cd D:\JobRoomz\KArtSell.Aegis
 
 # Set actual API keys from Gitea Secrets (not test keys!)
 $env:KRX_API_KEY = "<actual-krx-api-key>"
 $env:OPENDART_API_KEY = "<actual-opendart-api-key>"
 $env:KIS_API_KEY = "<actual-kis-api-key>"
-$env:ASPNETCORE_ENVIRONMENT = "Development"
 
-# Run in DEBUG mode (Development environment)
-dotnet run --project src/KArtSell.Host
+# CRITICAL: Run with --configuration Debug (DEVELOPMENT mode)
+# This enables DevelopmentHeaderAuthenticationHandler (reads X-KArtSell-User header)
+# appsettings.Development.json will be loaded automatically
+dotnet run --project src/KArtSell.Host --configuration Debug --no-build
+
+# Expected output:
+# info: Microsoft.Hosting.Lifetime[14]
+#       Now listening on: http://127.0.0.1:5002
+# info: Microsoft.Hosting.Lifetime[0]
+#       Application started. Press Ctrl+C to shut down.
 
 # Expected output:
 # Now listening on: http://127.0.0.1:5002