// Quick Reference

# One-shot / headless mode
claude -p "prompt"                    # Non-interactive
claude -p "prompt" --output-format json # JSON output
cat file | claude -p "analyze"        # Pipe input

# Session management
claude --continue                       # Continue last session
claude --resume                         # Resume named session
claude --fork-session                   # Fork existing session
claude --add-dir ../other-repo          # Add extra directory

# Safety & limits
claude --allowedTools Read,Edit         # Restrict tools
claude --max-turns 10                   # Limit turns
claude --max-budget-usd 5               # Set spend limit

# Model selection & effort
claude --model claude-opus-4-6          # Pick model
claude --fallback-model claude-haiku-4-5 # Fallback
claude --effort high                    # Deep reasoning depth
claude --verbose                        # See thinking

# Add to ~/.zshrc or ~/.bashrc
alias c="claude"
alias cc="claude --continue"           # Continue last session
alias cr="claude --resume"              # Resume with selection
alias cq="claude -p"                    # Quick single prompt
alias cplan="claude --permission-mode plan" # Start in Plan Mode

# Project Guidelines

## Tech Stack
- Language/Framework versions
- Key dependencies

## Code Style
@Rule Naming conventions
@Rule Structural patterns

## Error Handling
@Rule Exception strategy
@Rule Logging patterns

DO:
```java
// Good example with context
```

DO NOT:
```java
// Bad example to avoid
```

## Testing
@Rule Test framework patterns
@Rule Naming conventions

## DO NOT
- Anti-patterns to avoid
- Common mistakes

.claude/
  skills/
    java-testing.md     # Skill file
    code-review.md      # Another skill
    refactor.md         # Another skill

# Skill file format
---
description: Generate tests following team patterns
---

# Instructions go here
Apply to: $ARGUMENTS

## Instructions
## Reference Examples
@src/test/ExampleTest.java
## DO NOT

{
  "hooks": {
    "PreToolUse": [
      {
        "matcher": "Bash",
        "hooks": [
          {
            "type": "command",
            "command": "echo 'About to run a command'"
          }
        ]
      }
    ],
    "PostToolUse": [
      {
        "matcher": "Write",
        "hooks": [
          {
            "type": "command",
            "command": "echo 'File was written'"
          }
        ]
      }
    ]
  }
}

{
  "mcpServers": {
    "postgres": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-postgres",
        "postgresql://user:pass@localhost:5432/db"
      ],
      "lazyLoad": true
    }
  }
}