Keel Framework is an open source initiative dedicated to defining and standardizing software architectures on top of mature technologies such as Spring, Apache or Python. It provides reference architectures for enterprise environments that encapsulate the technical and cross-cutting capabilities (security, session, integration, observability), so that each project only has to build what is specific to it.
Keel starts from a simple idea: projects should not have to solve the same problems of architecture, infrastructure and cross-cutting capabilities over and over again.
Every framework in the Keel family applies the same method: start from a mature base technology, establish a reference architecture on top of it and turn the common decisions into reusable capabilities.
Keel does not try to replace the technologies it is built on.
It starts from mature ecosystems widely used in production, such as Spring, Apache or Python, and uses their capabilities instead of reinventing them.
The base technology provides the infrastructure.
Keel establishes how to use it consistently.
On that foundation, Keel defines a reference architecture and encapsulates in independent modules the capabilities that are common to many projects.
Security, observability, transport, configuration, integration and other cross-cutting capabilities stop being decisions each team has to solve from scratch.
Keel also establishes development conventions, modular composition and centralized version management through BOMs, providing a common technical base for projects.
From that architecture, specialized frameworks are built for concrete needs.
Each framework combines the technology foundation with the Keel capabilities and also provides the scaffolding needed to generate a project ready to develop the business logic and deploy it.
Today, that application is Keel MCP, aimed at building Model Context Protocol servers. Tomorrow, the same architecture can extend to new use cases and technologies.
The use case changes.
The architectural philosophy remains.
The Keel architecture encompasses the choice of the foundation technology and the modules and conventions built on top of it. Your application rests on that whole and only adds the domain.
A framework for building production-ready Model Context Protocol servers. It applies the Keel architecture to the MCP use case and provides the project scaffolding so that developers can start directly with the domain logic. Available for Java; the Python version is planned for December 2026.
The use case evolves. The technology can change. The architectural principles remain consistent.
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