wtf is stencil?

Stencil is a schema registry for Protocol Buffers (protobuf), a popular format for efficiently packaging structured data. The core problem it solves is the friction of updating data definitions. Normally, when you change a protobuf schema, every application using it needs to be recompiled and redeployed. For a company with hundreds of applications sharing thousands of data definitions, managing these updates becomes a massive operational headache. Stencil acts as a central hub that lets applications discover and use updated schemas dynamically, without requiring full redeploys. Under the hood, the project takes advantage of a built-in protobuf capability to describe schemas as raw data. Instead of forcing applications to hardcode compiled schemas at build time, Stencil serves these schema descriptions at runtime. This means an application can ask the server for the latest version of a data structure on the fly. The README does not go into deep detail on the exact API mechanics, but the general approach allows systems to stay in sync with data changes seamlessly. This tool is designed for engineering teams operating at scale, particularly those using microservices. For example, if a product team adds a new field to an event stream that multiple backend services consume, those services can automatically adapt to the new structure through the registry. It eliminates the need for developers to manually update shared code libraries across dozens of projects just to accommodate a minor data format change. The server is built in Go and supports different storage backends for holding the schemas. Teams can store schemas in Google Cloud Storage or simply on a local filesystem. The project is quite lightweight, and the README is sparse regarding enterprise features, suggesting it is focused on solving a specific infrastructure problem rather than being an all-inclusive platform.