Roblox Prototype Builder: create, edit, and verify a Draft

Describe one repeatable action, one form of feedback, and one short-term goal. For an Obby, that may be moving between checkpoints and reaching a finish. For a survival game, it may be waiting, avoiding a hazard, and seeing a round result. For another genre, reduce the idea to a starter loop before listing future systems. A concise brief makes it easier to identify what the initial Draft can actually demonstrate.

You can begin with a provided template or type your own prompt into the same composer. Those are two ways of describing an idea, not two separate agents or approval paths. The workspace should show a scope check and a reviewable plan. If a request needs missing genre-specific systems, the plan should name that gap rather than silently relabel a generic scene as a complete game.

Obby and Round Survival have bounded initial Build paths, with known project structure and test expectations. Other ideas, including Tycoon, Simulator, and tower defense concepts, can start through a generic starter-prototype path. That path can help inspect a proposed core loop, visual direction, or player feedback, but Roblox play remains unverified and the Build does not create every genre mechanic, progression system, monetization feature, or multiplayer rule implied by the label.

When you review the plan, look for three categories: what the first Build will contain, what remains an assumption, and what is outside the current supported surface. If the intended experience depends on an unsupported mechanic, simplify the first loop or defer that feature. This is a design choice, not a failure of the idea. A small honest prototype gives you something to test and revise without pretending a broad genre is finished.

After plan confirmation, download the .rbxlx Draft and keep its Build ID. Use a specific revision request: name the object, rule, or section to change, the behavior to preserve, and the outcome you want. The Agent can propose a bounded change and show what it intends to touch. A statement in chat is not a completed edit; completion requires the modification to be applied, persisted, built, and checked against the new version.

The workflow keeps earlier Builds instead of replacing the only usable file. Generated Luau modifications are limited to declared writable files and require approval of the exact diff. This is helpful for focused changes to a project produced here. It is not a general-purpose editor for arbitrary imported Roblox repositories or an automatic round-trip for manual Studio edits. If you change the Studio file directly, record that separately so the workspace does not assume it knows the new state.

A structural check can confirm that a generated file exists, references expected objects, and satisfies certain constraints. It cannot tell you whether the game feels fair, whether a player understands the objective, or whether a multiplayer rule works across clients. Open the exact Build in Roblox Studio, test the core loop, note confusing moments, and capture findings tied to that version. For a revision, retest the affected behavior even if an older Build had already passed.

Use the result to choose one next improvement: clearer feedback, a shorter wait, a safer checkpoint, or a better first minute. Keep release checks separate from prototype checks, including device behavior, asset permissions, rights, and publication. The Roblox Prototype Builder is a way to move from prompt to editable Draft to evidence-backed iteration. It is not an instant browser game, a guarantee of commercial success, or an automatic Roblox release pipeline.