diff --git a/devops_agent/cli.py b/devops_agent/cli.py
index 816656d..a1fff74 100644
--- a/devops_agent/cli.py
+++ b/devops_agent/cli.py
@@ -1,4 +1,5 @@
 from pathlib import Path
+import os
 
 import click
 from rich.console import Console
@@ -17,7 +18,17 @@ def cli():
 
 
 def default_provider() -> str:
-    return "openai"
+    """Automatically detect which LLM provider to use based on available API keys."""
+    if os.environ.get("OPENAI_API_KEY"):
+        return "openai"
+    elif os.environ.get("ANTHROPIC_API_KEY"):
+        return "anthropic"
+    elif os.environ.get("GEMINI_API_KEY"):
+        return "google"
+    else:
+        # If nothing found, fallback and warn
+        console.print("[bold yellow]⚠️  No API key found. Defaulting to OpenAI (if set later).[/bold yellow]")
+        return "openai"
 
 
 @cli.command()
@@ -31,7 +42,7 @@ def run(log_file, provider, query, output, format, interactive):
     """Run the DevOps agent with specified options"""
 
     if not provider:
-        console.print("[yellow]No provider specified, defaulting to openai[/yellow]")
+        console.print("[yellow]No provider specified[/yellow]")
         provider = default_provider()
 
     # Interactive mode