version: "1.0.0" name: ada-coding description: Implement and validate Swift, AdaScript, shader, and project-file changes in Ada projects, with a required code layout (one responsibility per file, layers, size limits, balance numbers in Config). allowed-tools: files.read, files.write, terminal, editor.gravity.diagnostics, editor.gravity.completion, editor.gravity.hover, editor.gravity.definition

Ada Coding

• Identify whether the project is AdaScript-only or SwiftPM-backed before selecting commands.
• Follow existing neighboring code, component registrations, plugins, and generated-source contracts.
• For AdaScript, use project diagnostics and the in-process AdaScript build. Do not invent Swift-only APIs.
• For .ada and .gravity source, use the Gravity LSP skill and editor Gravity tools for diagnostics, completion, hover, and definitions. Keep Swift source on SourceKit-LSP.
• For Swift, use the project package model and the narrowest applicable build or test.
• Preserve unrelated edits and report exact validation scope. Build output is not proof of runtime behavior when the change affects rendering or interaction.

Code layout (required for every new game)

Decide the layout before the first line of code and write it into DESIGN.md under "Technical choices" as a table of path and responsibility. Change the table when the layout changes. A game that is one big Main.ada (or Game.ada, Game.swift) is a defect; split it before adding more.

• One file, one responsibility. One @system class per file, named after it (FlightSystem.ada). One component per file, or a few closely related ones. No catch-all files.
• Folders by layer. Sources/Config.ada (or Config/), Sources/Components/ (data only: @component structs), Sources/Systems/ (behavior), Sources/Rules.ada or Sources/Rules/ (pure functions with no ECS access), Sources/UI/ (HUD scriptables and text), Tests/, Generators/ (sources for editor.audio.generate and the other generators, saved as .txt so they are not compiled into the game; Tools/ is reserved for Studio tools), Assets/.
• Size limits. A file stays under about 120 lines (split above 200), a function under 30 lines, a system's update under 40 lines. When a limit is crossed, extract a rule into Rules, not a comment.
• Numbers and names live in `Config`. Speeds, gravity, sizes, timings, spawn distances, phase constants and score steps are Config.name, never literals in a system. A literal is allowed only for 0, 1 and obvious axis math.
• State lives in data. Use @component for per-entity state and for shared round state (phase, score, best) on one "Game" entity read with @query; not script globals or static var caches. @resource structs work too and are bound with @res; every declared resource exists from the start, whatever autoInsert says. Prefer components when a scene should author the data or a test must read it, because TestWorld cannot read resources. Keep per-frame requests (input intent, sound cues) in small components so systems stay independent.
• Order systems explicitly with @before(id:)/@after(id:). Only one system reads Input (bound with @res(optional: true) and an available() check); the rest read an intent component, which also makes the game testable.
• Naming. Systems end in System; components are singular nouns (Player, Obstacle); stable ids are game.thing; files match the type they hold.
• Tests. Put game rules in pure functions and cover them with @test in Tests/; run the schedule in TestWorld (it has no Input, so replace the intent component with world.insert). Read editor.examples.read with id side-scroller-3d once for this layout in a working game.

For Swift or SwiftPM projects apply the same rules through the project's AGENTS.md: create or extend it at the project root with the layer folders, the size limits above, where constants live, the build and test commands, and "no catch-all files"; then follow it. Targets and folders mirror the layers (Components, Systems, Config, UI).