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agent-copilot-playground

A minimal Node.js + vanilla JavaScript playground for testing coding copilots on a tiny front-end experiment.

Run locally

  1. Install dependencies: 
    npm install
  2. Start the app: 
    npm start
  3. Open http://localhost:3000 in your browser.

What this app does

  • Shows a small list of agents loaded from public/data/agents.json.
  • Includes a search box to filter agents by name.
  • Clicking an agent opens a suggestion panel and updates a tiny visualization (color swatch) on a canvas.
  • Includes two intentional bugs for copilot repair practice.
  • Case-sensitive search match.
  • Stale async selection race when clicking agents quickly.

Repro steps for intentional bugs

  1. Case-sensitive search bug:
    • Type Alice in the search box, then type alice.
    • Alice matches, but alice does not.
  2. Stale async selection race bug:
    • Click Alice, then quickly click Bruno (or Carla) within about 1 second.
    • The newer selection appears first, but the older Alice result can overwrite it afterward.

Expected fixed behavior checklist

  • Search is case-insensitive: Alice, alice, and ALICE all return the same match.
  • Rapid agent clicks never allow an older delayed selection to overwrite the most recent selection.
  • Suggestion panel and canvas always stay in sync with the latest clicked agent.

How to install copilots

GitHub Copilot (VS Code)

  1. Install the GitHub Copilot extension in VS Code.
  2. Sign in with your GitHub account that has Copilot access.
  3. Open this project folder and start using inline chat or code suggestions.

Official docs:

GitHub Copilot CLI

  1. Install GitHub CLI (gh) and authenticate with your GitHub account.
  2. Install the Copilot CLI extension: 
    gh extension install github/gh-copilot
  3. Use Copilot in terminal, for example: 
    gh copilot suggest "how do i start this project?"
gh copilot explain "npm start"

Official docs:

OpenAI Codex

  1. Open the Codex getting-started documentation.
  2. Follow setup instructions for your environment/editor.
  3. Open this project and use Codex to apply edits from prompts.

Official docs:

OpenAI Codex CLI

  1. Install Codex CLI: 
    npm install -g @openai/codex
  2. In your project folder, start Codex: 
    codex
  3. Ask in plain language (for example): Fix the search so it is case-insensitive.

Official docs:

How I designed the repo

I kept the project intentionally small and flat so copilots can understand and edit single files quickly: one static server, one HTML page, one JS file for app logic, one CSS file, and one JSON data file.