Overview

FEVEX is an Agent Engineering Framework for code-first, provider-neutral AI agents in TypeScript. It gives you the small contracts needed to define agents, tools, model adapters, validation and tests without adopting a heavy runtime.

Early MVP

FEVEX is usable for bounded local agent runs, but its API may change before the first stable release.

Why FEVEX

• Provider-neutral — application code depends on ModelGateway, not a model vendor SDK.
• Typed tools — Standard Schema validators infer inputs and validate every runtime boundary.
• Small runtime — one package, ESM, Node.js 20+, no database or service required.
• Observable — successful and failed runs emit structured events and optional local traces.
• Testable — @fevex/core/testing ships a deterministic model and shared model contract checks; @fevex/core/evals adds local regression suites.

Next steps

• Install the core package and any adapters you need.
• Run the Quickstart — a full model → tool → model cycle with no network access.
• Learn the core concepts: Agents, Tools and Models.