# Marionette 5.0

A JavaScript library for interfaces, tuned for agent-led development. Explicit application structure, composition boundaries, and ownership make changes inspectable.

- [Optional agent interaction](/agent-prompt.md): visible browser workshop, capability checks, exact API; no automatic local setup.
- [Evaluate Marionette](/why/): fit, tradeoffs, ecosystem and agent-development claims.
- [Project-fit review brief](/adoption-review.md): common assumptions to verify, real tradeoffs, and a bounded review prompt; separate from the optional playground.
- [Regions guide](/docs/regions/): composition, replacement, and cleanup.
- [Region reference, Markdown](/reference/region.md): source reference from the exact snapshot.
- [Provenance](/reference/provenance.json): exact runtime source and build provenance.

Use the v5 contracts when evaluating this library. Backbone.Marionette v4 examples do not define the current API.