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Best Practices & Slash Commands

Master GitHub Copilot with proven techniques and powerful shortcuts that professional developers use daily.

Advanced Setup Strategies​

Use the @workspace Agent​

Start your prompt with @workspace so Copilot Chat can analyze your entire project and give more precise, context-aware answers.

@workspace How should I structure the authentication middleware for this Express app?

Install Real-Time Linters​

Install linters like Ruff (Python) in your IDE to catch Copilot's suggestions immediately—squiggles show errors instantly!

# Linter catches issues immediately ⚠️
def problematic_function():
    undefined_variable = some_missing_import()  # Red squiggle appears

Essential Slash Commands​

Slash commands are your secret weapon for common development tasks. Here are the most powerful ones:

Essential Slash Commands

CommandDescriptionExample Usage
/explain 🔍Get code explanations/explain what does the fetchPrediction method do?
/fix 🔧Propose fixes for code/fix the authentication bug in login route
/tests 🧪Generate unit tests/tests create comprehensive tests for UserService
/doc 📚Add documentation/doc add JSDoc comments to this function
/generate ⚡Generate new code/generate email validation regex with error handling
/optimize 🚀Improve performance/optimize this database query for better speed
/new 🆕Scaffold projects/new create a FastAPI app with authentication
/simplify 🎯Simplify complex code/simplify this nested loop structure

Advanced Slash Commands​

CommandDescriptionExample
/newNotebook 📊Create Jupyter notebooks/newNotebook analyze sales data with pandas and matplotlib
/fixTestFailure 🔥Fix failing testsAutomatically detects and fixes test failures
/clear 🗑️Clear chat session/clear - Start fresh conversation
/help ❓Get help/help what can you do with API testing?

Powerful Tricks & Agents​

@terminal Agent​

Generate and run shell commands directly in VS Code terminal.

@terminal create a Python virtual environment and install FastAPI dependencies

Result: Copilot generates and runs:

python -m venv venv
source venv/bin/activate  # or venv\Scripts\activate on Windows
pip install fastapi uvicorn

GitHub CLI Integration​

Use Copilot within GitHub CLI for repository management.

gh copilot explain "git rebase -i HEAD~3"
gh copilot suggest "create a pull request with these changes"

Auto-Generate Documentation​

Quickly create comprehensive documentation with one command.

def complex_calculation(data, weights, threshold=0.5):
    # Highlight this function and use /doc
    pass

# Result: Copilot adds complete docstring

Explain Terminal Errors​

Highlight error output and choose "Explain with Copilot" for instant solutions.

# Copy this error and ask Copilot to explain:
ModuleNotFoundError: No module named 'requests'

Pro Tips for Maximum Efficiency​

1. Context is King​

# Keep related files open - Copilot sees all context
# models.py (open)
# views.py (open) 
# tests.py (current file)

# Now ask: "Generate tests for the User model validation"
# Copilot knows about your User model structure!

2. Be Specific with Frameworks​

// ❌ Generic: "Create a component"
// ✅ Specific: "Create a React functional component with TypeScript and hooks"

interface Props {
  userId: string;
}

const UserProfile: React.FC<Props> = ({ userId }) => {
  // Copilot generates TypeScript-aware React code
};

3. Leverage Conversation Memory​

# First prompt: "Create a User class with validation"
class User:
    def __init__(self, email, password):
        # ... generated code

# Follow-up: "Add password hashing to the User class"
# Copilot remembers the previous context and adds to existing class

4. Use Examples for Complex Logic​

# Complex business logic example:
# Calculate shipping cost based on:
# - Weight: $2 per kg
# - Distance: $0.5 per km  
# - Express: +50% surcharge
# Example: calculate_shipping(2kg, 100km, express=True) -> $9

def calculate_shipping(weight_kg, distance_km, express=False):
    # Copilot generates accurate calculation based on examples

Quick Reference Card​

Daily Workflow Commands:

  • Ctrl/Cmd + I → Inline chat
  • /tests → Generate tests
  • /fix → Fix issues
  • /explain → Understand code
  • @workspace → Project-wide context

Troubleshooting Commands:

  • /fixTestFailure → Fix failing tests
  • @terminal → Shell command help
  • /optimize → Performance improvements
Pro Workflow
  1. Open all related files 📁
  2. Use @workspace for context 🌐
  3. Start with /generate or /new ⚡
  4. Iterate with /fix and /optimize 🔧
  5. Finish with /tests and /doc 📚

Ready for advanced techniques? Check out our Agent Mode and Testing Strategies guides! 🚀