Claude Cowork: The Definitive Setup Guide

What Cowork Actually Is Cowork is an agentic desktop tool built into the Claude Desktop app. It gives Claude direct read/write access to folders on your computer, the ability to execute multi-step tasks autonomously, and the capacity to coordinate parallel sub-agents, all without a terminal or command line. It launched January 12, 2026. Availability expanded to Pro subscribers on January 16, Team and Enterprise on January 23, and Windows (x64) on February 10. On February 24, Anthropic shipped a major enterprise update with new plugins, connectors, and admin controls. Key distinction from regular Claude chat: Chat is prompt-response. Cowork is task delegation. You describe an outcome, Claude makes a plan, breaks it into subtasks, executes in a sandboxed VM on your machine, and delivers finished files to your folder. You can step away and come back to completed work. Cowork is built on the same agentic architecture as Claude Code (Anthropic's terminal-based coding tool). Boris Cherny reportedly built Cowork in ~10 days using Claude Code itself. Still a research preview. Anthropic is explicit: agent safety is under active development. Treat it accordingly. Requirements Platform macOS (universal) or Windows (x64 only). No arm64 Windows. No mobile. No web. Subscription Any paid plan: Pro ($20/mo), Max 5x ($100/mo), Max 20x ($200/mo), Team ($25+/seat/mo), Enterprise (custom) Desktop App Latest version from claude.com/download Internet Active connection required throughout the session App must stay open Closing the desktop app kills the session. Sleep is fine, quitting is not. Step 1: Install and Access Cowork Download the Claude Desktop app from claude.com/download. Sign in with your paid account. Open the app. Find the mode selector at the top, click the "Cowork" tab to switch from Chat to Tasks mode. You're in Cowork. Step 2: Set Up Your Working Folder Cowork operates on a folder-permission model. You grant Claude access to a specific directory, and it can read, edit, and create files within it. The dedicated workspace approach Create a dedicated folder for Cowork rather than pointing it at your entire home directory or Documents folder. This is a safety best practice confirmed by Anthropic's own safety documentation. ~/Claude-Workspace/ ├── context/ # Your standing context files ├── projects/ # Active project folders │ ├── client-a/ │ └── client-b/ └── outputs/ # Where Claude delivers finished work Why this matters: Cowork runs in a VM but has real read/write/delete access to any folder you share. Anthropic's safety guide explicitly warns: "Claude can take potentially destructive actions (such as deleting local files) if it's instructed to." A dedicated workspace limits blast radius. Backup first. Before your first real task, back up anything in the folders you plan to share. cp -R ~/Claude-Workspace/ ~/Claude-Workspace-Backup/ is cheap insurance. Cloud sync for cross-device access Cowork is desktop-only with no built-in sync. If you work across machines, put your workspace in a cloud-synced folder (iCloud Drive, Dropbox, OneDrive) so at least your files are consistent. This won't sync Cowork sessions, just the files. Step 3: Write Your Context Files This is the highest-leverage setup step. The quality of Cowork's output is directly proportional to the quality of context you provide in files. Create these in your context/ folder as .md (Markdown) files. Markdown is the most token-efficient format for Claude to read. about-me.md brand-voice.md working-preferences.md The compounding effect: These files get better over time. After every session where Claude's output missed the mark, update the relevant context file. You can also ask Claude Desktop to help you write these three files based on all previous discussions you got together. Step 4: Set Global and Folder Instructions Instructions are standing directives that load automatically at the start of every Cowork session. Global Instructions: Go to Settings > Cowork in Claude Desktop. Click "Edit" next to Global Instructions. Write your core preferences and save. What to put here (distilled from your context files): Keep this concise. Global instructions load every session, consuming context window. Folder Instructions: Folder-specific instructions activate when you select that folder in Cowork. Use these for project or client-specific context. Example: Your projects/client-a/ folder might have instructions like: Claude can also update folder instructions during a session based on what it learns. Step 5: Install Plugins Plugins bundle skills, slash commands, connectors, and sub-agents into role-specific packages. How to install: In Cowork, click the "Customise" menu in the left sidebar. Click "Browse plugins" to see available options. Click Install on your chosen plugin. Or browse at claude.com/plugins. What's available (as of February 27, 2026) Anthropic open-sourced 11 plugins on January 30 and