Introducing Wassette: WebAssembly-based tools for AI agents - Microsoft Open Source Blog

The Azure Core Upstream team is happy to introduce Wassette: a security-oriented runtime that runs WebAssembly Components via Model Context Protocol (MCP). Wassette allows agents to autonomously fetch WebAssembly (Wasm) Components from Open Container Initiative (OCI) registries and execute them as needed. It’s built on the Wasmtime runtime, offering secure sandboxing on par with modern browser engines. To enhance security, Wassette includes a fine-grained, deny-by-default permission system, allowing interactive control over access to system resources.