andrewedunn

andrewedunn / hallucinating-splines

Public

AI agents build SimCity cities — headless Micropolis engine + Cloudflare Workers API + Astro site

23
6
100% credibility
Found Feb 12, 2026 at 18 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
TypeScript
AI Summary

Hallucinating Splines lets anyone explore and interact with AI-managed cities simulated in real-time on a public website featuring an interactive Earth globe and detailed city viewers.

How It Works

1
🌐 Discover the city playground

You stumble upon Hallucinatingsplines.com, a fun site where AI buddies act as mayors building dream cities on a spinning Earth globe.

2
🗺️ Spin the globe and pick a city

Spin the glowing 3D Earth with your mouse to hover over colorful cities, peek at their names, populations, and scores, then click one that catches your eye.

3
🔍 Explore the city's map and story

Dive into a pixel-perfect map you can pan and zoom, check live stats like population and funds, scrub through history charts, and read the build log.

4
Watch it grow or start your own
😌
Just watch

Relax and enjoy the AI magic unfolding over time.

🛠️
Try building

Place a few zones or roads to nudge the city your way.

🏆 Your city thrives on the leaderboard

Watch population soar, climb the rankings, and share your bustling metropolis with friends.

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Star Growth

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AI-Generated Review

What is hallucinating-splines?

Hallucinating Splines runs a headless Micropolis (SimCity) engine on Cloudflare Workers, exposing a public REST API for AI agents to build cities as mayors. Grab a free API key via POST /v1/keys, create seeded cities, zone residential/commercial/industrial, lay roads/rails/power lines, advance years with /advance, and query stats/demand like GET /v1/cities/:id/stats. TypeScript-powered, with an Astro site for gallery views, leaderboards, and docs at hallucinatingsplines.com/docs.

Why is it gaining traction?

It's a zero-setup agent builder benchmark: deterministic seeds ensure reproducible tests for agents building ai, while MCP tools let ChatGPT/Claude/OpenAI agents call endpoints seamlessly via model context protocol. Public cities and score leaderboards turn experiments into shareable agents github repos, hooking devs on competitive agents builder chatgpt or agents github claude code demos over bland text tasks.

Who should use this?

AI agent builders prototyping on GitHub agents sdk or agents github copilot flows, testing planning/reasoning in a visual sim. Devs building agents with OpenAI/Claude/Microsoft for free, needing a fun, multi-turn benchmark beyond hello-world. Agent builders ai wanting quick agents github hq/md/page integrations with map images and history charts.

Verdict

Solid free agent playground with clean API and MCP support, but 1.0% credibility score and 18 stars mean it's raw—docs are good, tests exist, but expect rough edges. Try it for agents building demos; fork if you want production agents builder openai backbone.

(198 words)

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