Close Your Laptop and Keep the Side Project Moving Without Burning Your Card

A stalled side project sits on a paid AI subscription, and the next run could cost more than the weekend. A 2025 METR randomized study involving 16 experienced open-source developers and 246 tasks found that allowing early-2025 AI tools increased completion time by an estimated 19%.

A Cursor Projects instance uses its own cloud machine, so the work keeps going even when your laptop is closed. Cursor made Projects available in beta on September 10. That is the tempting part: hand a bounded task to a background process and go to sleep. The risk is the same as any metered service. If the run is not metered, the bill arrives later.

Set the cap before the first run

Most side projects stay side projects, and that is fine. The close-laptop rule treats the cloud coordinator as a metered task runner with a hard stop before the bill exceeds the cap:

• Set a dollar spend cap before the agent starts.
• Choose one bounded long task with a clear finished state.
• Wire one trigger that matches how you check the project.
• Watch the token bill before adding more.

You are renting a small amount of machine time, and the run does not stop because your weekend ends. The Projects beta is offered on paid Cursor plans, with the lowest paid tier at $20 per month. The subscription floor is not the ceiling. For a weekend project, make the cap smaller than the subscription, low enough that a bad run is a small cost.

Write the cap in the same place you write the task. A cap that lives only in your notes will not stop the run. A cap in the settings can stop the run. The cap is the first control, not the last.

A bounded task keeps the run short

The task needs a clear end: a failing test that passes, a broken page that renders, a migration that runs. The finished state should be something you can check without opening a debate. Do not ask the coordinator to improve the app. Vague asks are how a weekend build becomes an open-ended background job.

A Projects coordinator can assign tasks to thousands of subagents. That power helps when the task is narrow. It hurts when the task is vague. When the end is unclear, the agent will keep finding work.

Name the task, its starting state, and its finished state. If the task needs a product decision, make the decision before you close the laptop.

A predictable trigger keeps the bill small

Wire a trigger and leave the rest off. You are done when a single event starts the work: a scheduled run, a pull request, or a chat message. The Projects coordinator can respond to Slack channel activity, scheduled runs, or pull-request and CI events. Pick the trigger that fits the way you actually check the project.

The trigger should start the work when you expect it, not when the network is active. The mistake is treating the coordinator as unlimited help, then discovering the bill after the weekend. A trigger that fires too often is wrong for a build that only matters on the day you check. A scheduled run fits a project that only needs work while you are away. Use a pull-request trigger when the project only needs a response to code changes. When you are unsure, start with the least active option.

The bill is the stop signal

After the first run, check the token bill before adding more. The review should be quick: what changed, what cost, and whether the output is worth another pass. Cursor's internal design-system Project is projected to affect between 20 and 100 pull requests daily. That scale belongs to a company workflow, not a weekend project.

If your build is not producing that kind of value, stop at an early useful result. Use the bill to make the call before the next run. If the bill stays small and the output keeps paying for itself, the project may be ready to become a company; if not, keep it a side project.