refactor: remove health check and rely on MCP session initialization

The /health endpoint has session authentication requirements that make it
unsuitable for pre-connection testing. Instead, we now rely on the MCP
session initialization itself to verify connectivity.

This simplification:
- Removes unnecessary health check step
- Tests the actual MCP endpoint we care about
- Provides better error messages when connection fails
- Aligns with how the official MCP SDK is designed to be used

The MCP SDK will handle connection errors gracefully and provide
clear error messages if the server isn't reachable.

Author: jruokola

test_agentic_mcp.py

@@ -319,50 +319,8 @@ async def run_http_tests():
     print("\n🌐 Using HTTP/SSE transport")
 
     mcp_url = f"http://{HTTP_HOST}:{HTTP_PORT}/mcp"
-    print(f"  URL: {mcp_url}")
-
-    # Quick check if server is reachable
-    print(f"\nChecking HTTP server health...")
-    print(f"  Endpoint: http://{HTTP_HOST}:{HTTP_PORT}/health")
-
-    try:
-        import httpx
-        async with httpx.AsyncClient() as client:
-            # Try health check with SSE headers (server may require them)
-            response = await client.get(
-                f"http://{HTTP_HOST}:{HTTP_PORT}/health",
-                timeout=2.0,
-                follow_redirects=True,
-                headers={
-                    "Accept": "text/event-stream, application/json, */*"
-                }
-            )
-            if response.status_code != 200:
-                print(f"❌ Health check failed: HTTP {response.status_code}")
-                print(f"   Response: {response.text[:200] if response.text else 'empty'}")
-                print(f"\n⚠️  Troubleshooting:")
-                print(f"   - Is the CodeGraph HTTP server running on port {HTTP_PORT}?")
-                print(f"   - Check: ps aux | grep codegraph")
-                print(f"   - Try: curl -H 'Accept: text/event-stream' http://{HTTP_HOST}:{HTTP_PORT}/health")
-                print(f"\nStart HTTP server with:")
-                print(f"  ./target/release/codegraph start http --host {HTTP_HOST} --port {HTTP_PORT}")
-                return 1
-        print("✓ Server is reachable\n")
-    except Exception as e:
-        print(f"❌ Cannot reach server: {e}")
-        print(f"\n⚠️  Troubleshooting:")
-        print(f"   - Is the server running? Check: ps aux | grep codegraph")
-        print(f"   - Wrong port? Common ports:")
-        print(f"     - 3000: Default HTTP server port")
-        print(f"     - 3003: Your configured port (CODEGRAPH_HTTP_PORT)")
-        print(f"     - 3004: SurrealDB (NOT for HTTP)")
-        print(f"   - Check firewall/network: curl http://{HTTP_HOST}:{HTTP_PORT}/health")
-        print(f"\nExpected .env configuration:")
-        print(f"  CODEGRAPH_HTTP_HOST={HTTP_HOST}")
-        print(f"  CODEGRAPH_HTTP_PORT={HTTP_PORT}")
-        print(f"\nStart HTTP server with:")
-        print(f"  ./target/release/codegraph start http --host {HTTP_HOST} --port {HTTP_PORT}")
-        return 1
+    print(f"  Connecting to: {mcp_url}")
+    print(f"  (Server must be running: ./target/release/codegraph start http --port {HTTP_PORT})\n")
 
     results = []
 
@@ -464,8 +422,13 @@ async def run_http_tests():
 
     except Exception as e:
         print(f"\n❌ Failed to connect via SSE: {e}")
-        import traceback
-        traceback.print_exc()
+        print(f"\n⚠️  Troubleshooting:")
+        print(f"   - Is the server running? Check: ps aux | grep codegraph")
+        print(f"   - Verify server is listening on port {HTTP_PORT}")
+        print(f"   - Check server logs for errors")
+        print(f"\nStart server with:")
+        print(f"  ./target/release/codegraph start http --host {HTTP_HOST} --port {HTTP_PORT}")
+        print(f"\nIf you need detailed error info, run with RUST_LOG=debug")
         return 1
 
     # Print summary