Real AI agent use cases, with sources and setup prompts
Short answer: A coding agent is a loop: send the task and context to a model, let it call tools (read files, edit files, run shell commands, run tests), feed the results back and repeat until the work is done. Builders below wrote that loop in a few hundred lines of shell, added durability so runs survive crashes, shared one database across Claude Code, Codex and OpenCode, and even let a harness rewrite itself from its own failures (50% to 67% on unseen Terminal-Bench tasks). Start small with a handful of tools, run commands in a sandbox, log every step, and benchmark against an existing agent on the same tasks.
Builders who wrote their own agent loop, harness or editor around Claude, Codex and open models, and what each one adds over the stock tools. 18 matching use cases below, each with a public source.
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Omnara is an open-source, self-hostable alternative to Claude Managed Agents and OpenAI's Agents API. You create an agent with an API call; Omnara runs the agent loop, gives it sandboxes to run commands in and keeps runs going.
Lugh Xtudio is a desktop video studio where Claude Code, Codex or Antigravity does the editing on a real timeline and you can still adjust anything by hand. It is aimed at creators and faceless channels.
Vercel released durable-harness, which wraps Pi, OpenCode, Codex and Claude Code so a run that is killed mid-task can pick up where it stopped instead of forgetting everything. It works locally, on Vercel or on your own infrastructure.
Vercel extended the durability system behind its Workflows product to any agent harness, including Pi and OpenCode, as open source. It runs locally, on Vercel or on your own servers, so agent runs can be resumed after failures.
The founders of Relay, a local-first agent supervisor, pre-registered a 5-test suite with hidden judges and ran their tool, Claude Code, Prime Agent and Hermes through the same token meter on Sonnet 5.5 and Haiku 5.5, then published the losses along with the wins.
He had Claude Code build a code editor shaped around how he works, and talks to his agents through Full-Duplex Code, an open-source voice layer for Claude Code and Codex.
He built an open-source server where you name the harness (Claude Code, Codex, Pi or about 20 more) and send a request, with each run sandboxed. Use it for one-off jobs, build agents on top, or write loops instead of prompts.
A developer built CloudHarness MCP, a whole coding agent harness inside one MCP server: pi agents run inside it and carry out tasks delegated from ChatGPT, skills install from any GitHub repo, and credentials are injected without showing up in chat.
Based on a 2026 Harness Learning paper, a developer built a coding-agent harness that studies its own failed runs and rewrites itself. He kept the model (Claude Sonnet 5.5) and tasks fixed and only let the harness change.
The follow-up to the viral parents'-TV post shares the exact prompt, the launcher source and the gotchas the builder hit, so anyone can point their own coding agent at an Android TV or Google TV and get the same clean home screen.
A developer built his own agent harness workspace on top of Claude Code, Codex, OpenCode and Grok Build. All sessions share one SQLite database, work streams are Discord-style channels, and each agent has its own persona, memory, skills and scheduled jobs.
Built Rhun, a small cross-platform editor in assembly with Vim mode, terminal, git diffs and panels for Claude Code or Codex.
Shipped HarnessRouter: Unified interface for agent harnesses and shared it as a Show HN.
Built Pu.sh, a full coding-agent harness in about 400 lines of shell.
Built an open-source agent that the author reports topped TerminalBench on Gemini-3-flash-preview.
Two Neovim fans wanted an agent harness they could customize as deeply as their editor, so they built Ito, a Lua library for terminal UIs. Its browser playground ships an ito.md guide you paste into your LLM along with what you want to make.
Built a LangGraph workflow plus C++ harness so agents can run, benchmark and Nsight-profile CUDA kernels.
Built Peerd, an AI agent harness that runs entirely in the browser.
How to make faceless YouTube videos with AI · How to automate work with n8n and AI · How to vibe code an app with Claude Code · How to build AI agents for SEO and ads · How to run multiple coding agents together · How to build an MCP server for AI agents · How to add memory to coding agents · How to secure vibe-coded apps and agents · How to observe and debug AI agents · How to build agent memory and context layers · How to control coding agents from your phone · How to add payments to vibe-coded apps · How to run local LLMs with AI agents · How to set up Grok Bot agents for real work · How to build with Gemini 4 Argon and Gemini agents · How to use AI agents for taxes, bills and budgets · How to make AI video ads and Reels with agents · How to set up Hermes Agent workflows · How to vibe code a game with AI · How to replace SaaS subscriptions with vibe-coded tools · How to use AI agents for errands, calls and shopping · How to use Cursor agents and automations · How to make 3D scenes and models with AI and Blender · How to use Claude Code skills and plugins · How to cut AI coding agent costs and token use · How to automate a small business with AI agents · How to compare AI models on the same prompt · How to build hardware projects with AI agents · How to make AI music videos and songs · How to use AI agents with Obsidian and your notes · How to build apps and games for your kids with AI · How to use ChatGPT for real projects and everyday tasks · How to make AI agents ask for approval before they act · How to build AI trading and investing agents · How to build AI agents that make and answer phone calls · How to plan meals and groceries with AI agents · How to use AI agents for fitness and health · How to undo, checkpoint and stop runaway coding agents · How to use AI agents for job hunting · How to automate social media posts with AI agents · How to build a smart home and voice assistant with AI agents · How to make money with AI agents · How to build a website with AI agents · How to use AI agents for research and science · How to build an iPhone or Android app with AI · How to automate email and your inbox with AI agents · How to use AI agents for Linux, servers and homelabs · How to build Telegram, Discord and WhatsApp bots with AI · How to research memecoins and crypto with AI agents · How to remove ads and bloatware from your smart TV with AI · How to self-host AI agents on a Raspberry Pi, Mac mini or homelab · How to learn anything with an AI tutor · How to build an AI second brain and personal wiki · How to reverse-engineer and revive old devices with AI · How to edit videos with Claude Code and Codex · How to set up an AI family assistant · How to make a Godot, Unity or 3D game with AI agents · How to build a custom Android TV or Google TV launcher with AI · How to use Claude Code and Codex together · How to build your own invoicing and bookkeeping app with AI · How to make a browser arcade game with AI · How to make a product demo or launch video with AI · How to fix Wi-Fi and secure your home network with AI · How to control Claude Code and Codex by voice · How to design a PCB and electronics with AI · How to save, share and resume coding agent sessions · How to run AI coding agents in a sandbox · How to make a multiplayer game with AI · How to let AI control your computer (computer use) · How to build a Mac menu bar app with AI · How to port code to another language with AI · How to make an AI animated short film or anime · How to get notified when Claude Code or Codex needs you · How to build a Chrome extension with AI · How to use AI agents with Excel and Google Sheets · How to run Claude Code and Codex in a desktop app (T3 Code, Codex app, Claude Desktop) · How to make a song or album with AI · How to vibe code classroom apps and quizzes as a teacher · How to plan and book a trip with an AI agent · How to make motion graphics and animated videos with Claude Code · How to mod and reverse engineer games with AI · How to run AI agents overnight while you sleep · How to negotiate bills and get refunds with an AI agent
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