Claude Cowork Functionalities: Full Guide to Web and Mobile Expansion

Claude Cowork functionalities now include support for web and mobile access, as announced by Anthropic on July 7, 2026.

This update lets users run agentic tasks across devices, with sessions and files following their workflow whether on desktop, browser, or mobile app.

This guide explains how Claude Cowork works on web and mobile, practical use cases, and compliance considerations for regulated industries.

What Is Claude Cowork and Its Expansion to Web and Mobile?

Claude Cowork is Anthropic’s collaborative AI feature that allows users to start, resume, and run agentic tasks—complex, ongoing operations—across desktop, web, and mobile devices.

On July 7, 2026, Anthropic announced that Cowork will roll out to both web browsers and mobile platforms, allowing more flexible access to sessions and documents.

Previously limited to desktop apps for deep work, Cowork now lets users initiate and manage AI tasks within the claude.ai web interface and sidebar access in official mobile apps.

This means work can continue uninterrupted as users switch between laptop, browser, or phone.

• Supports real-time in-depth collaboration on documents and tasks
• Persistent sessions transfer between devices
• Agentic tasks keep running in the background, unaffected by device changes

How Do Claude Cowork Sessions and Files Follow Users?

Claude Cowork sessions are designed to follow the user as they move between devices, keeping tasks active and files accessible.

This persistent session architecture means tasks continue to run even when the original device—for example, a laptop—closes or goes offline.

Files and context uploaded to a session are available on any device logged into the same Anthropic account, removing the need for manual transfer.

• Switch from a desktop session to mobile or web without restarting tasks
• Files, chat, and agentic task progress are synced in the account
• Background processing allows for task completion while away from the app

Starting and Managing Cowork Sessions Across Devices

Users can start a Cowork session from claude.ai in any web browser or from the sidebar in Claude’s official mobile apps, with desktop support focusing on more complex workflows.

To initiate a session, users log in and select a document or workflow to open with Cowork, which creates a shared, AI-supported workspace.

Sessions remain active in the background and update in real time as the user moves between devices, supporting multi-step projects and agentic processes.

• Access Cowork from desktop, browser, or mobile app
• Use sessions for document editing, summarization, code, or research tasks
• Mobile sidebar enables input and file uploads on the go

Practical Use Cases for Cowork Functionalities in Regulated Firms

Claude Cowork functionalities help regulated workflows by supporting collaborative, persistent tasks that can traverse secure environments as users move.

Teams working in healthcare, insurance, or finance can review sensitive files on secure desktops, then monitor ongoing sessions or review summaries using mobile devices without duplicating data transfers.

A common failure mode observed with regulated SMBs is improper access control when users transition from desktop to mobile; during workflow automation reviews with clients in finance, Layer3 Labs found it essential to verify session management policies and device-level security before deploying Cowork for file review or collaboration.

• Legal teams preparing documents over several days benefit from session persistence
• Healthcare admins can upload forms on mobile for processing initiated on desktop
• Insurance firms can use Cowork for distributed claims review with audit-ready session logs

Data Security and Compliance Considerations

Deploying Claude Cowork in regulated industries requires careful attention to data security, session management, and compliance rules such as HIPAA or GDPR.

Sessions and files transferred between devices must comply with organization access policies and local data residency requirements.

Anthropic’s systems support encrypted file transfer and device authentication, but organizations must still review their configuration for mobile and browser access, and audit user permission logs regularly.

Layer3 Labs recommends firms coordinate with IT and compliance teams before deploying Cowork broadly, especially when handling PHI or customer financial data.

• Verify encryption in transit and at rest before uploading sensitive files
• Use organizational SSO to limit account access across personal devices
• Regularly audit session histories for files accessed outside controlled environments

Claude Cowork Functionalities vs. Other Cross-Device AI Tools

Claude Cowork distinguishes itself among cross-device AI assistants by enabling persistent, multi-device sessions with agentic task management, while many other tools require manual handoff or have limited background processing.

The table below compares Claude Cowork with two common alternatives: a traditional file-sharing AI assistant and an LLM-powered mobile copilot.