Replit Agent
Best for: Zero-setup build + host
An agent that builds and hosts the app in one place. Nothing to install, which is the whole point.
Visit Replit Agent ↗Home / Use case
Let an AI agent work overnight — safely
“I want an agent to chew through a queue of tasks while I sleep.”
Background agents can work through a to-do list in sandboxes and leave you pull requests in the morning. Give them a clear queue, limits, and nothing they can merge alone.
Fix it yourself in 3 steps
- Write the queue: small, separate tasks, each with a 'done when' line.
- Run the agent in a sandbox or branch per task, with a time or spending cap.
- In the morning, review each pull request; close what's wrong instead of fixing it in place.
Copy this prompt
Work through these tasks one at a time: [list, each with 'done when']. Use a separate branch per task and run the tests before marking it done. Stop if you hit [time/spend cap] or get stuck twice on the same task. Never merge, deploy, or change secrets. Leave me a morning summary: done, stuck, skipped.
Fill in the [brackets]. Each prompt says when the AI should stop, so it doesn't wander off.
Agents people used for this: Cursor, Codex, Replit Agent, Grok Bot.
Inspired by real examples collected at agentusecases.ai.
📚 9 real stories of people doing this with AI agents
- Build a project management tool with a 24-hour agent run · Cursor
- Debug overnight with a long-running agent · Codex
- Keep coding agents running autonomously for long stretches · Cursor
- Monitor tasks and open pull requests with long-running agents · Cursor
- Queue maintenance and bug fixes for Cursor background agents · Cursor
- Rebuild a platform and add RAG features in one day · Replit Agent
- Run background agents with an email-style approval inbox · custom-built or unnamed agent
- Shepherd PRs to merge automatically · Grok Bot
- Spend leftover AI quota on reviewable PRs · Claude | Codex
Collected at AgentUseCases.ai.
Tools for this
Cursor
Best for: Editor-first developers
A VS Code-style editor built around AI, with background agents. The comfortable choice if you live in an editor.
Visit Cursor ↗OpenAI Codex
Best for: Delegating tasks as PRs
OpenAI's coding agent, in the CLI and in the cloud. Good at handing off well-scoped tasks that come back as pull requests.
Visit OpenAI Codex ↗Grok Bot
Best for: Chores that repeat — done for you
The easiest AI helper for everyday people: show it a chore once — a morning brief, checking a bill, watching for a refund — and it keeps doing it while you're away, checking in only when it needs your OK. Works from the Grok app on your phone and computer (beta).
Visit Grok Bot ↗