Building an agent is easy until the first model, storage, retrieval, runtime, or UI change turns into an application-wide migration. AgentsKit solves that with stable TypeScript contracts for models, tools, skills, memory, RAG, runtimes, observability, sandboxes, evaluation, and interfaces. Teams install only the packages they need, self-host, run hosted or local models, and replace any layer without rebuilding the application.

The wider ecosystem includes Chat for agent interfaces, Registry for ready-made agents installed as source code you own, Agents Playbook for executable engineering practices, Doc Bridge for keeping agent instructions aligned with human documentation, and Code Review for repository-aware review automation. AgentsKit and these products are free and open source under permissive licenses.

AKOS is separate and optional: a managed control plane for organizations that need enterprise infrastructure, governance, RBAC, egress controls, RAG, observability, and provider independence without operating every layer themselves.