fix: improve input validation, error logging, and env var handling

- Add validate_account_id() for get_account_holdings input validation
- Fix double logging bug in retry_on_auth_error decorator
- Remove emojis from log messages for cleaner log parsing
- Make PORT and LOG_LEVEL environment variables functional
- Delete redundant requirements.txt (pyproject.toml is authoritative)
- Clarify MONARCH_PORT is for Docker Compose only in .env.example

src/monarch_mcp_custom/server.py

@@ -4,6 +4,7 @@ Monarch Money MCP Server - Custom SSE Implementation.
 
 import logging
 import json
+import os
 from typing import Optional, Any
 
 from dotenv import load_dotenv
@@ -17,9 +18,11 @@ from monarch_mcp_custom.auth import get_authenticated_client, retry_on_auth_erro
 # Load environment variables
 load_dotenv()
 
-# Configure logging
+# Configure logging with LOG_LEVEL from environment
+log_level = os.getenv("LOG_LEVEL", "INFO").upper()
 logging.basicConfig(
-    level=logging.INFO, format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+    level=getattr(logging, log_level, logging.INFO),
+    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
 )
 logger = logging.getLogger(__name__)
 
@@ -124,13 +127,23 @@ async def get_budgets(reason: Optional[str] = None) -> str:
     return serialize_json(budget_list)
 
 
+def validate_account_id(account_id: str) -> int:
+    """Validate and convert account_id to integer."""
+    if not account_id or not account_id.strip():
+        raise ValueError("account_id must be provided and cannot be empty")
+    try:
+        return int(account_id.strip())
+    except (ValueError, TypeError):
+        raise ValueError("account_id must be a valid integer")
+
+
 @mcp.tool()
 @retry_on_auth_error()
 async def get_account_holdings(account_id: str, reason: Optional[str] = None) -> str:
     """Get investment holdings for a specific account."""
+    validated_id = validate_account_id(account_id)
     client = await get_authenticated_client()
-    # The library expects an int for account_id
-    holdings = await client.get_account_holdings(int(account_id))
+    holdings = await client.get_account_holdings(validated_id)
     return serialize_json(holdings)
 
 
@@ -176,4 +189,5 @@ app = create_app()
 if __name__ == "__main__":
     import uvicorn
 
-    uvicorn.run(app, host="0.0.0.0", port=8000)
+    port = int(os.getenv("PORT", "8000"))
+    uvicorn.run(app, host="0.0.0.0", port=port)