tessl/npm-anthropic-ai--claude-code

Claude Code is an agentic coding tool that lives in your terminal, understands your codebase, and helps you code faster by executing routine tasks, explaining complex code, and handling git workflows

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Overview

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CLI Interface

Name: tessl/npm-anthropic-ai--claude-code
Author: tessl

The Claude Code CLI provides an interactive terminal-based interface for AI-assisted coding through natural language commands.

Capabilities

Main CLI Command

The primary entry point for Claude Code that starts an interactive session.

# Start Claude Code interactive session
claude

# Usage patterns:
# 1. Run from project root directory for full codebase context
# 2. Interact through natural language commands
# 3. Claude understands your codebase and can perform various tasks

Usage Examples:

# Navigate to your project
cd /path/to/your/project

# Start Claude Code
claude

# Example interactions:
# User: "Help me understand this authentication flow"
# User: "Create a new React component for user profiles" 
# User: "Fix the failing tests in the user service"
# User: "Explain what the calculateTotalPrice function does"
# User: "Create a git commit with all staged changes"

Interactive Features

Claude Code provides several interactive capabilities:

Codebase Understanding: Automatically analyzes your project structure and code
Natural Language Processing: Interprets coding requests in plain English
Context Awareness: Maintains context across conversations within a session
Task Execution: Can perform file operations, run tests, execute git commands
Code Explanation: Provides detailed explanations of existing code
Code Generation: Creates new code based on requirements
Real-time Steering: Send messages while Claude works (interactive mode)
Background Commands: Execute commands in background with Ctrl+b
Mode Switching: Auto-accept mode with Shift+Tab
Vim Bindings: Optional vim-style key bindings
File Completion: Tab completion for files and directories
Image Support: Drag & drop, clipboard paste, @-mention files
Transcript Mode: Access conversation history with Ctrl+R

Command Patterns

Natural Language Commands

Common interaction patterns with Claude Code:

# Code analysis requests
"Explain this function"
"What does this component do"  
"How does the authentication work"

# Code modification requests
"Fix this bug"
"Add error handling to this function"
"Refactor this component to use hooks"

# File operations
"Create a new component"
"Add a test file for this module"
"Update the README with installation instructions"

# Git operations  
"Create a commit with these changes"
"Create a new branch for this feature"
"Show me the git status"

# Testing and debugging
"Run the tests"
"Fix the failing tests"
"Add unit tests for this function"

Slash Commands

Direct commands for specific actions:

# File and project management
/add-dir path/to/directory     # Add directories to context
/memory                        # Edit memory files
/context                       # Debug context issues
/export                        # Export conversations
/resume                        # Switch conversations
/clear                         # Clear conversation

# Development workflow
/bug "Issue description"       # Report bugs
/cost                          # View usage and costs
/todos                         # List current todos
/pr-comments                   # Handle PR comments
/install-github-app           # Install GitHub integration

# Configuration and tools
/doctor                        # Validate configuration
/permissions                   # Manage tool permissions
/model                         # Model selection
/statusline                    # Customize status line
/vim                          # Enable vim bindings
/config                       # Configuration management
/mcp                          # MCP server management
/agents                       # Create custom subagents
/status                       # View system status
/release-notes                # View release notes
/upgrade                      # Upgrade subscription

Session Management

Each Claude Code session maintains:

Project Context: Understanding of your codebase structure and content
Conversation History: Previous interactions and decisions within the session
File State Tracking: Awareness of file modifications during the session
Tool Access: Ability to execute various development tools and commands
Multi-session Support: Handle multiple concurrent conversations
Session Persistence: Resume conversations across restarts
Context Compaction: Automatic cleanup while preserving important context
Memory Management: Intelligent memory file handling

Interactive Controls

# Real-time interaction
Ctrl+b                         # Run command in background
Shift+Tab                      # Toggle auto-accept mode
Ctrl+R                         # Access transcript mode
Ctrl+C                         # Interrupt current operation
Tab                           # File/directory completion

# File operations
@filename.js                   # Mention file in conversation
@directory/                    # Mention directory
Drag & drop                    # Add images/files to context
Clipboard paste                # Paste images directly

# Session commands
"exit" or Ctrl+C              # End session
/clear                         # Clear current conversation
/resume conversation-id        # Switch to different conversation

Installation and Setup

# Global installation via npm
npm install -g @anthropic-ai/claude-code

# Verify installation
claude --version
claude --help

# Start using in any project directory
cd /your/project
claude

# Alternative startup options
claude --print "single command"       # Non-interactive mode
claude --settings custom.json         # Custom settings
claude --add-dir additional/path      # Include additional directories
claude --mcp-config servers.json      # With MCP servers

Configuration

Claude Code behavior can be customized through:

Hook System: Custom validation and processing of tool executions
Custom Commands: User-defined workflows and specialized tasks
Project-specific Settings: Configuration stored in .claude/ directory
Global Settings: User-wide configuration in ~/.claude/settings.json
Environment Variables: Control behavior through environment variables
MCP Servers: Extend capabilities with Model Context Protocol servers
Output Styles: Customize response formatting and verbosity
Permission System: Fine-grained tool access control

Configuration Files

~/.claude/settings.json        # Global user settings
.claude/settings.json          # Project-specific settings  
CLAUDE.md                      # Project context and instructions
.mcp.json                      # MCP server configuration
~/.claude/commands/            # Custom slash commands

Error Handling

Claude Code handles various error scenarios:

Project Detection: Graceful handling when not in a project directory
Permission Issues: Clear error messages for file system permission problems
Tool Failures: Appropriate error reporting when underlying tools fail
Network Issues: Handling of API connectivity problems
Authentication Failures: Clear guidance on authentication setup
Configuration Errors: Validation and helpful error messages
MCP Server Issues: Server health monitoring and error reporting
Hook Failures: Graceful degradation when hooks fail
Rate Limiting: Automatic retry with backoff strategies

Error Recovery

# Diagnostic commands
/doctor                        # Run comprehensive diagnostics
/doctor --verbose              # Detailed diagnostic output
/doctor --fix-permissions      # Attempt to fix permission issues

# Recovery actions
/config --reset                # Reset to default configuration
claude --reset-auth            # Reset authentication
claude --clear-cache           # Clear cached data
/mcp --restart server-name     # Restart failed MCP server

Exit and Cleanup

# Exit Claude Code session
# Use Ctrl+C or type "exit" to end the session
# Claude Code will clean up any temporary resources

# Graceful shutdown
"exit"                         # Normal session termination
"quit"                         # Alternative exit command
Ctrl+C                         # Interrupt and exit
Ctrl+D                         # EOF signal (Unix/Linux)

# Session cleanup
# - Closes active MCP server connections
# - Saves conversation history
# - Releases file system resources
# - Clears temporary files and caches
# - Executes SessionEnd hooks if configured

Advanced Usage

Print Mode for Automation

# Single command execution
claude --print "Fix the bug in auth.js"

# JSON output for programmatic use
claude --print "Analyze code" --output-format=json

# Batch processing
for file in *.js; do
  claude --print "Review $file" > "review-$file.txt"
done

Integration with Development Tools

# Git hooks integration
#!/bin/bash
# pre-commit hook
claude --print "Review staged changes" --output-format=text

# CI/CD pipeline integration
claude --print "Generate PR description" --system-prompt-file ci-prompt.txt

# IDE integration
# VS Code extension provides seamless integration
# Real-time diff display and diagnostics

Install with Tessl CLI

npx tessl i tessl/npm-anthropic-ai--claude-code

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