System Prompt Builder

See how Claude Code assembles its instructions dynamically — it's never the same twice

Base Instructions

Environment

CLAUDE.md Chain

Available Tools

Skills

Permissions

Hooks

System Reminders

Assembled Prompt Preview

Base Instructions

You are Claude Code, Anthropic's official CLI for Claude.
You are an interactive agent that helps users with software engineering tasks...

Environment

- Platform: darwin
- Shell: zsh
- Working directory: /Users/dev/my-project
- Is a git repository: true

CLAUDE.md Chain

# CLAUDE.md
## Stack: React + TypeScript
## Conventions: Use functional components...

Available Tools

Available tools:
- Read: Read files
- Edit: Edit files
- Bash: Execute commands
- Grep: Search content
+ 26 more tools

Skills

Available skills:
- /commit: Create git commits
- /review-pr: Review pull requests
- /simplify: Simplify code

Permissions

Permission mode: autoEdit
Allowed: Read, Grep, Glob
Requires approval: Bash, Edit, Write

System Reminders

- Current date: 2026-04-01
- Deferred tools: WebFetch, WebSearch, TaskCreate...
- Context window: 45% used