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Aaron Powell
40665c23b7
* Migrate extension plugin materialization layout Materialize extension plugins into a dedicated extensions/ container, validate the new manifest convention, and bump extension plugin versions. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1 * Keep extension manifests source-compatible Restore source extension manifests to "extensions": "." while preserving materialization-time rewrite to "extensions" in distribution output. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1 * Validate canvas extension layout for external submissions Add intake and quality-gate checks for canvas-tagged external plugins so they must include extensions/extension.mjs and optional manifest extensions is validated when present. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1 * Fix plugin clean extension pass and typo guard text Declare EXTENSIONS_DIR in clean-materialized-plugins and run extension cleanup once after plugin cleanup. Also normalize misspelled-key detection strings to satisfy spelling checks without changing validation behavior. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1 * Proper codespell fix * Separate canvas structure quality gate status Track canvas structure as its own gate status and output, include it in aggregate summaries, and enforce Git object types so extensions/ is a tree and extensions/extension.mjs is a blob. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1 * Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Agent Arcade Canvas
A GitHub Copilot canvas that opens a retro arcade in the side panel. It serves the built Agent Arcade Phaser frontend and lets either the user or the agent switch between five mini-games.
Games
- Alien Onslaught — Space Invaders-style arcade action with marching aliens, shields, and mystery ships.
- Cosmic Rocks — Asteroids-style vector shooter with thrust physics and splitting asteroids.
- Galaxy Blaster — Galaga-style space shooter with formation enemies, attack patterns, and dual-shot power-up.
- Ninja Runner — Classic platformer with double jumps, power-ups, warp pipes, and enemies.
- Planet Guardian — Defender-style side-scrolling shooter with humanoid rescues and six enemy types.
Files
extension.mjs— canvas declaration, loopback game server, static asset handling, and agent actions.game/— compiled Phaser game frontend served inside the canvas.assets/— game sprites, sounds, app icon, andpreview.pngfor the extensions gallery.package.json— declares the Copilot SDK dependency and ESM entry point.copilot-extension.json— Copilot extension name/version metadata.canvas.json— Awesome Copilot gallery metadata.
Prerequisites
- Node.js 20.19 or newer because the Copilot SDK requires
node ^20.19.0 || >=22.12.0. - The GitHub Copilot app canvas / UI-extensions experiment enabled.
Install
Drop this folder at ~/.copilot/extensions/arcade-canvas/ for user scope, or in a repository at .github/extensions/arcade-canvas/ for project scope. Then install dependencies from inside the copied folder:
# User scope
cd ~/.copilot/extensions/arcade-canvas
# Or project scope, from the repository root
cd .github/extensions/arcade-canvas
npm install
Reload extensions in the GitHub Copilot app, then open the arcade-canvas canvas. The canvas accepts an optional defaultGame input with one of these keys: cosmic-rocks, alien-onslaught, galaxy-blaster, ninja-runner, or defender.
Agent actions
list_games— list available mini-games and the currently selected game.select_game { gameKey }— switch the open arcade canvas to a specific mini-game.restart_game— reload the open arcade canvas to restart the current game.
Development
In the Agent Arcade repository, rebuild the committed canvas bundle after frontend or asset changes:
npm run build:canvas
That command builds the frontend, copies dist/game into game/, copies dist/assets into assets/, writes assets/preview.png for the Awesome Copilot gallery, and bundles assets/canvas-background.webp for the canvas-only space backdrop.
Credits
- Sprite assets: Simple Platformer 16 by JuhoSprite.
- Space shooter assets: Space Shooter Redux by Kenney.nl.
- Galaga-style game mechanics: WesleyEdwards/galaga by Wesley Edwards.
- Asteroids-style game mechanics: phaser3-typescript by digitsensitive.
- Defender-style game mechanics and sound effects: OpenDefender by mkinney.
- Retro game sound effects: "Retro game sound effects" by Vircon32 (Carra), published at OpenGameArt under CC-BY 4.0.
- Thanks to John Papa for his Alien Onslaught game PR.
- Thanks to Shayne Boyer for the initial PR to get Agent Arcade running in the GitHub App canvas.