devsummit2026-ai-lab

AI4Dev Lab — Small model. Better context. Better output.

Stack: Phaser 3 + TypeScript + Vite
Model constraint: Small models only — gpt-5-mini, gpt-5.4-mini, claude-haiku-4-5, gemini-3-flash
CLI: OpenCode or GitHub Copilot

In GitHub Copilot: gpt-5-mini costs 0× (free), gpt-5.4-mini / claude-haiku-4-5 / gemini-3-flash cost 0.33×.

Presented by @bertrandgressier & @ThomasRumasLM

→ Open the lab

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Which files to fill in?

Tool	Agent stubs	Prompt/Command stubs
OpenCode	.opencode/agent/*.md	.opencode/command/*.md (already wired)
GitHub Copilot	.github/agents/*.md	.github/prompts/*.prompt.md

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Setup

git clone https://github.com/bertrandgressier/devsummit2026-ai-lab.git
cd devsummit2026-ai-lab
npm install
npm run dev   # → http://localhost:3000

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Configure your CLI

OpenCode

https://opencode.ai/docs/#install

npm install -g opencode-ai
opencode providers login 

select github-copilot → opens browser → login to GitHub → authorize device

Running opencode in your terminal

opencode

Then select a small model: In opencode settings (/models), select a small model only:

• github-copilot/gpt-5-mini (0×)
• github-copilot/gpt-5.4-mini (0.33×)
• github-copilot/claude-haiku-4-5 (0.33×)
• github-copilot/gemini-3-flash (0.33×)

Forbidden: claude-sonnet, claude-opus, gpt-4o, gemini-pro

GitHub Copilot

Open the project in VS Code with the GitHub Copilot extension.
Use Copilot Chat in agent mode — select a small model in Copilot Chat settings.

Agents: invoke via @<agent-name> in Copilot Chat.
Prompts: run via the Copilot Chat prompt runner or / prefix.

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Slash commands / Prompts

OpenCode command	Copilot prompt	What it does
/plan <game description>	plan.prompt.md	Generate an implementation plan (architect)
/design <game + mood>	design.prompt.md	Generate visual specs (designer)
/code [instruction]	code.prompt.md	Implement plan files in order, or act on an explicit instruction
/qa <game name>	qa.prompt.md	Review all game files, save report to .agents/qa-report.md
/archive	archive.prompt.md	Archive the current spec before the next game

OpenCode: commands live in .opencode/command/
Copilot: prompts live in .github/prompts/

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Agents

Four roles — fill in the stub that matches your tool:

Agent	Role	OpenCode	Copilot
architect	Reads game description + ARCHITECTURE.md → produces ordered plan saved to .agents/spec.md	.opencode/agent/architect.md	.github/agents/architect.md
designer	Produces DESIGN.md with exact colors, layout, animations	.opencode/agent/designer.md	.github/agents/designer.md
coder	Implements all spec files in order (skips already-done), or acts on an explicit instruction	.opencode/agent/coder.md	.github/agents/coder.md
qa	Reviews code against ARCHITECTURE.md rules, saves report to .agents/qa-report.md, never modifies files	.opencode/agent/qa.md	.github/agents/qa.md

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Skills

One skill in .agents/skills/:

Skill	What it provides
phaser-patterns	Phaser 3 code patterns (interactive objects, tweens, transitions...)

OpenCode: skills are declared in agent frontmatter (skills: [phaser-patterns]).
Copilot: instruct the agent to read .agents/skills/phaser-patterns/SKILL.md at startup.

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File structure after setup

.agents/
  skills/        ← reusable knowledge injected into agents
  spec.md        ← generated plan (gitignored)
  qa-report.md   ← latest QA report (gitignored)
.opencode/
  agent/         ← OpenCode role definitions
  command/       ← OpenCode slash commands
.github/
  agents/        ← Copilot agent definitions
  prompts/       ← Copilot reusable prompts
checkpoints/     ← reference implementations (facilitator unlocks)
src/             ← Phaser project (implement inside games/)
AGENTS.md        ← auto-loaded by every agent, maps key project files
ARCHITECTURE.md  ← folder structure, mandatory rules, scene types
LAB.md           ← step-by-step lab guide

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Checkpoint branches

Branch	What's in it
checkpoint-1	All agents pre-filled, Tic Tac Toe working — start here for Step 9
bonus-orchestrator	Full orchestrator setup with all subagents configured

git fetch origin && git checkout checkpoint-1

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Verify build

npm run build   # must exit 0