Runtimes Customizados

Explains the case for a hand-rolled runtime when frameworks add more overhead than value, and when that choice is rational rather than not-invented-here.

A first hand-rolled agent loop with no framework, just a model call and a tool dispatcher you can unit test.

A recipe for building a minimal, dependency-light agent loop as an API service in FastAPI or Express.

A recipe for a pluggable tool-registration system inside a hand-rolled agent runtime, with schemas, allowlists, and safe dispatch.

Ten-plus practices for keeping a hand-rolled agent runtime maintainable as it grows: budgets, plugins, evals, observability, and exit discipline.