adminandClaude Opus 5.5
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The prompt is meant as a benchmark: one agent, one prompt, and the goal is a finished engine rather than a measure of how far it gets. - The scope follows the decisions made on 2026-10-01. In: projects, scenes with a hierarchy, camera, containers with nesting and instance edits, behaviors, shaders and particle effects as graphs, colliders, animations, text with custom fonts, textures and sprites, state machines, variables assets, structs, typed lists, sound, the console and custom curves. - Out: accounts, plugins, the performance panel, export and player, tilemaps, the pixel art and vector art editors, run in editor, snapshots and hierarchy groups. - The stack is fixed except for the UI framework, which the agent picks itself. The interface is DOM, Pixi only draws the views. - "Done" is checkable: three sample games with smoke tests, numbered acceptance criteria and an ACCEPTANCE.md the agent has to fill in. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>