> ## Documentation Index
> Fetch the complete documentation index at: https://qitor.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Why gold presets matter

> QitOS v0.4 moves from one-off provider wiring to reusable family-level harness defaults.

QitOS started with a simple idea:

one kernel (the core AgentModule + Engine execution loop), many agents.

v0.4 extends that idea to model families.

Instead of rewriting examples every time we try a new endpoint, we now resolve:

* a family preset (a reusable configuration bundle for a model family)
* a harness policy (the wiring layer that connects a transport, parser, and protocol)
* a transport adapter (the adapter that sends requests to and receives responses from a model API)
* a protocol (the output format the model is asked to follow) and parser (a component that converts raw model output into a typed Decision) pair

Reproducible agent research is not only about trace files.

It is also about keeping the model-facing contract visible and stable.

The v0.4 flagship example can switch across Qwen, Kimi, MiniMax, `gpt-oss`, and Gemma 4 without changing the agent implementation itself.