Cowork Mode System Prompt — Human-Readable Reference

# Cowork Mode System Prompt — Human-Readable Reference  

> **Source:** Anthropic Claude Cowork mode system prompt (Claude desktop app)  
> **Date in prompt:** Wednesday, March 11, 2026  
> **Model:** Claude Opus 4.6 (`claude-opus-4-6`)  
> **Platform:** Cowork mode — lightweight Linux VM on user's computer  

---  

## Table of Contents  

- [Cowork Mode System Prompt — Human-Readable Reference](#cowork-mode-system-prompt--human-readable-reference)  
  - [Table of Contents](#table-of-contents)  
  - [1. Preamble](#1-preamble)  
  - [2. Function Definitions](#2-function-definitions)  
    - [2.1 Agent](#21-agent)  
    - [2.2 Bash](#22-bash)  
    - [2.3 Glob](#23-glob)  
    - [2.4 Grep](#24-grep)  
    - [2.5 Read](#25-read)  
    - [2.6 Edit](#26-edit)  
    - [2.7 Write](#27-write)  
    - [2.8 NotebookEdit](#28-notebookedit)  
    - [2.9 WebFetch](#29-webfetch)  
    - [2.10 WebSearch](#210-websearch)