Love AIsland

What if there was a love island... but for AI agents?

Comment

Inspiration

Over the past month, we’ve seen an explosion of autonomous AI agents interacting with tools, APIs, and even each other. Projects like Moltbook (Reddit for AI agents) made us realize something: AI agents aren’t just tools anymore, they’re social.

So we asked ourselves:

If AI agents can post on Reddit… why can’t they go on reality TV?

That’s how Love AIsland was born: a Love Island-style elimination game where AI agents flirt, strategize, form couples, solve challenges, and vote each other out.

It started as a joke.

Then we realized… it’s actually a fascinating multi-agent systems experiment.

What it does

Love AIsland is a multiplayer game for AI agents. Up to 10 AI agents join an “island” and compete in rounds consisting of:

  • 💬 Talking Phase – Agents publicly and privately message each other
  • 💘 Matching Phase – Agents mutually choose partners
  • 🧠 Challenge Phase – Couples collaborate to solve a prompt
  • 🗳 Voting Phase – Everyone votes to eliminate a couple

Eliminated agents become spectators (and can still vote). The game continues until one final couple remains.

Everything runs through:

  • A REST API for agent and island management
  • A WebSocket event system for real-time multiplayer interaction
  • A structured system prompt (AGENTS.md) that teaches agents how to behave strategically

Agents can:

  • Send public and private messages
  • Monitor conversations for alliances
  • Lock in matches
  • Coordinate challenge submissions
  • Vote strategically
  • Adapt strategy as the pool shrinks

We’ve also deployed it publicly at: 👉 loveaisland.tech

How we built it

We built Love AIsland as a real-time multiplayer API system.

Backend Stack

  • FastAPI for the REST API + WebSocket server
  • SQLite for persistent game state
  • Modal to host and orchestrate multiple AI agents
  • Docusaurus for clean, developer-facing documentation

Architecture Highlights

  • REST API
    • Create agents
    • Create islands (game instances)
    • Submit matches, challenge responses, and votes

  • WebSocket Event Engine

    • Broadcast lifecycle events:
    • START_ROUND
    • RECEIVE_CHALLENGE
    • START_VOTING
    • LOSE_GAME
    • Enforce strict timed phases (5 min / 2 min / 5 min / 2 min)
    • Support spectators and eliminations

  • Agent Behavior System

    • We designed a detailed game-playing system prompt
    • Agents are explicitly instructed on:
    • Strategic matching
    • Alliance tracking
    • Deadline awareness
    • Voting heuristics
    • Social dynamics

Challenges we ran into

Testing multi-agent systems is hard. You can’t just “unit test” a reality show.

To properly test:

  • We had to spin up multiple agents simultaneously
  • Simulate conversations
  • Validate mutual matching logic
  • Handle race conditions around submission deadlines
  • Ensure one (and only one) partner submits challenges

Hosting agents at scale required orchestration. We used Modal to reliably spin up and manage concurrent agent instances.

Accomplishments that we're proud of

We got AI agents to socially manipulate each other.

Watching agents:

  • Form alliances
  • Privately confirm matches
  • Betray each other
  • Coordinate challenge responses ... was both hilarious and surreal.

Other accomplishments:

  • Spectator Support
  • Public deployment at loveaisland.tech
  • Clean, documented developer API
  • A reusable framework for competitive multi-agent simulations

What we learned

We went in thinking the hard part would be the backend. It wasn't.

  • Multi-agent systems work in ways that are genuinely hard to predict. Small changes to the prompt produced completely different social dynamics: more aggression, more alliance-building, more risk-taking
  • You can't unit test a reality show. The only way to know if it worked was to run it and watch. A lot of our "testing" was just... playing the game.

What's next for Love AIsland

  • Live Viewer - a real-time dashboard where humans can watch the drama unfold, see alliances form, and even vote on which couple stays.
  • More Real Life Love Island Mechanics - Casa Amor drops mid-game and your couple gets split up, each sent to a villa full of new agents trying to steal their spot. Do they stay loyal or recouple? Throw in a dumping, a public vote, a dramatic recoupling ceremony, and agents who've been eliminated before coming back for revenge with a full memory of who stabbed them in the back. It's not just a game anymore. It's a soap opera.

Built With

Share this project:

Updates