Close the Laptop, Let Claude Keep Working: Cowork Cloud Sessions for Long-Running Engineering Tasks

TL;DR: Cowork now runs on Anthropic's servers — close your laptop and Claude keeps working, cross-device handoff just works, and scheduled tasks run with no device online.

Until Cowork's July 7 web and mobile launch, your session died when you closed the lid. Cloud sessions change the execution model: they run on Anthropic's infrastructure, stay alive after you close the app, are accessible from any device, and can be scheduled to start with no device online at all.

What's genuinely different for engineering workflows

This isn't just UI-across-devices. The architectural change is that Cowork tasks now run as persistent cloud processes, not local app processes. Concretely:

• Long tasks survive context switches. A 2-hour codebase audit no longer requires keeping your Mac awake.
• Scheduled tasks run unattended. Set a research sweep or batch refactor to run at 2 AM; pick up the results in the morning.
• No install required. Orgs with locked-down machines can now run Cowork from a browser tab.
• Cross-device continuity. Start at your desk, monitor on your phone, receive the finished artifact anywhere.

Engineering tasks that fit the async model best

Async Cowork works for tasks with a clear "go do this and return a result" shape — not conversational back-and-forth. Strong fits:

• Repository audits: "Read every file in /api, list all routes that don't validate the request body"
• Documentation batch: "Generate docstrings for all public functions in lib/, commit the draft to a new branch"
• Issue triage: "Check each open GitHub issue against the current codebase; tag which ones are still reproducible"
• Migration prep: "Identify every call to the deprecated v1/auth endpoint and output a migration guide"

Getting started

Open Cowork on the web at claude.ai (beta, Max plan first; other plans rolling out). Start your task and click "Run in background" to detach the session from your current device. For scheduled tasks, use the clock icon and pick a time — Claude will start at the scheduled time with no device online.

Anthropic extended doubled usage limits through August 5 to mark the rollout — a good window to experiment with what your team can hand off to background sessions.

Sources: Claude Cowork on web and mobile — claude.com/blog · TechCrunch — Cowork expands to web and mobile