$ grep -r "security" ~/blog/

The intersection of artificial intelligence and systems security has reached a critical inflection point. As AI agents become increasingly capable of executing external tools and accessing system resources, the traditional security models that govern software execution are proving inadequate. Microsoft’s Wassette emerges as a groundbreaking solution that leverages WebAssembly’s sandboxing capabilities to create a secure, scalable runtime for AI tool execution through the Model Context Protocol (MCP).

Wassette represents a paradigm shift from the current landscape of MCP server deployment, where tools typically run with unrestricted system access, to a capability-based security model that provides fine-grained control over resource access. This architectural evolution addresses fundamental security concerns while maintaining the flexibility and extensibility that make MCP valuable for AI system integration.

The evolution of web development from static document delivery to complex application platforms represents one of the most significant architectural transformations in software engineering. Modern web applications serve as the foundation for critical infrastructure spanning financial systems, healthcare platforms, and enterprise software—requiring engineering practices that prioritize reliability, security, and performance at scale. The principles outlined here reflect lessons learned from building production systems that serve millions of users across diverse operational environments.

Every web developer has encountered the frustration of inconsistent metadata discovery across different websites and services. Where do you find a site’s security contact information? How do you discover OAuth endpoints? What about password change URLs for password managers? The web’s decentralized nature, while powerful, has historically led to fragmented approaches for exposing essential service metadata.

The Well-known URI standard, formalized in RFC 8615 by the Internet Engineering Task Force (IETF), provides an elegant solution to this fundamental problem. By establishing a standardized location for service metadata at /.well-known/, this specification enables consistent, predictable discovery of critical information across the entire web ecosystem.