James Montemagno
e370b97107
Canvas extensions (accessibility-kanban, where-was-i) resolved git state
against the extension's install directory or the session-state folder
instead of the repo the session was opened in. This broke repo/branch
detection for user-scoped installs and worktrees ("unknown/unknown",
"detached HEAD"). Both now read the active session's working directory
from the canvas request context on open and on each action, so they
follow whichever project/worktree opened them.
where-was-i also re-gathers context on open when the saved branch is
blank, so it never opens stuck on stale data.
Also compress oversized extension preview images (pngquant, with a mild
resize for the photographic arcade-canvas art) so every preview.png is
comfortably under the installer's inline-byte cap that was blocking
release-notes-showcase from installing.
Update release-notes-showcase author to Kayla Cinnamon.
Co-authored-by: Copilot App <223556219+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.