mcp-server-pfm

The server employs API keys for authentication on the AWS API Gateway endpoints, using environment variables for secrets, which is good practice. Input validation is performed for the 'add_transaction' function. The use of broad CORS headers ('Access-Control-Allow-Origin: *') is generally acceptable for widely integrated APIs but could be restricted if specific client origins are known. The direct read-modify-write operation on the CSV file in S3 for 'add_transaction' carries a minor risk of race conditions or data loss under extremely high concurrent write loads, though this is less likely for a personal finance manager.