Fortifying APIs: Data Validation with Pydantic When building backend services, a fundamental principle stands above all others: never implicitly trust incoming data. Client applications, whether web, mobile, or third-party integrations, are inherently unpredictable. A seemingly innocuous input field expecting an integer for "age" might instead transmit "twenty-five". Without robust safeguards, s
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The Dangerous Bugs Are the Ones That Don't Crash: Building Input Validation for My MCP Server I was building an MCP server for an event platform that automates speaker communications (confirmations, reminders, calendar invites, follow-ups). An agent created a session confirmation for "Monday March 8th." March 8th was a Sunday. I caught it. But catching it was just the beginning. The confirmation
Some time ago, I was building a chat application using AWS Websocket API gateway. Things were going smoothly. I created a WebSocket API Gateway, added $connect, $disconnect, and sendMessage/addGroup routes. From the frontend (React) side, everything was fire-and-forget. You send a message, and the onMessageHandler takes care of it 💪🏼 But then a new requirement of uploading files using S3 signed