Choose a stack

Translate requirements into experimental questions.

Choose the system boundary first

Do you need building blocks for an application you will design, or a complete coding environment around the model?

Decision	Start with
I need orchestration, tools, state, approvals, or delegation APIs inside my application	Frameworks and SDKs
I need a coding agent that already owns prompts, tools, execution, permissions, persistence, and interaction	Coding agents and harnesses

Do not combine them in one ranking. A harness owns many variables that the framework experiment deliberately holds fixed. The comparison gateway explains the boundary.

Start here

Write down provider/protocol, tool access, approvals, durability, latency and budget requirements. For frameworks, read the decision guide and feature matrix. For complete environments, use the coding-harness matrix. Check the profile evidence label, inspect the methodology, and reproduce the relevant arena before choosing.

Prerequisites: a small task you can describe, its permitted effects, and basic Python for executable examples. Reading the guides needs no API key.

Evidence and coverage

Existing offline comparisons establish mechanics. Native provider answer-quality rankings remain unavailable until repeated live scorecards are published.

Follow the concept and build path for runnable lessons and the ecosystem map for wider coverage. Return to all journeys.