How to leverage slash commands for code actions on GitHub Copilot

intermediate 8 min read Updated 2026-03-18

Quick Answer

Slash commands in GitHub Copilot allow you to trigger specific code actions by typing commands like /explain, /fix, or /tests directly in your editor. These commands provide contextual assistance for code explanation, debugging, refactoring, and test generation.

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Prerequisites

GitHub Copilot subscription
VS Code or compatible IDE installed
GitHub Copilot extension enabled
Basic understanding of your programming language

Step-by-Step Instructions

Access Copilot Chat

Open the GitHub Copilot Chat panel in your IDE by pressing Ctrl+Shift+I (Windows/Linux) or Cmd+Shift+I (Mac). You can also click the Copilot Chat icon in the sidebar or use View > Command Palette and search for GitHub Copilot: Open Chat.

Pin the chat panel to keep it visible while coding for quick access to slash commands.

Use /explain command for code understanding

Select a code block in your editor, then type /explain in the Copilot Chat. Press Enter to get a detailed explanation of the selected code's functionality, logic flow, and purpose. You can also use /explain [specific concept] to ask about particular programming concepts.

Use /explain on complex algorithms or unfamiliar code sections to better understand the implementation.

Apply /fix command for error resolution

When you encounter errors or bugs, select the problematic code and type /fix in the chat. Copilot will analyze the code and suggest specific fixes or improvements. You can also describe the issue: /fix this function throws a null pointer exception.

Include error messages in your /fix command for more targeted solutions.

Generate tests with /tests command

Select a function or class you want to test, then use /tests to generate unit tests automatically. Copilot will create comprehensive test cases covering various scenarios. Specify test frameworks with /tests using Jest or /tests using pytest.

Review generated tests carefully and add edge cases specific to your application's requirements.

Optimize code with /optimize command

Select code that needs performance improvements and type /optimize. Copilot will suggest more efficient algorithms, better data structures, or performance enhancements. You can be specific: /optimize for memory usage or /optimize for speed.

Always benchmark before and after optimization to measure actual performance gains.

Use /doc command for documentation

Select functions, classes, or modules and type /doc to generate comprehensive documentation. Copilot will create docstrings, comments, and API documentation following your language's conventions. Use /doc JSDoc format for specific documentation styles.

Customize documentation style by specifying the format you prefer in your organization.

Combine slash commands with context

Enhance slash commands by providing additional context: /explain this regex pattern for email validation or /fix the authentication logic in this middleware. You can also chain commands by asking follow-up questions after receiving initial responses.

Be specific about your requirements to get more accurate and helpful responses from Copilot.

Accept and implement suggestions

Review Copilot's suggestions carefully, then use the Apply button or Copy icon to implement the recommended changes. You can also ask for modifications: Can you make this solution more concise? or Add error handling to this code.

Test all implemented suggestions thoroughly before committing to ensure they work correctly in your specific environment.

Common Issues & Troubleshooting

Slash commands not working or not recognized

Ensure your GitHub Copilot extension is updated to the latest version and restart your IDE. Check that your Copilot subscription is active and you're signed in to your GitHub account.

Generated code doesn't match expected programming language or framework

Be explicit in your commands: /tests using React Testing Library or /fix this Python function. Make sure your file has the correct file extension so Copilot can detect the language context.

Responses are too generic or not helpful

Provide more context by selecting relevant code and being specific in your requests. Use phrases like /explain how this handles user authentication instead of just /explain.

Copilot Chat panel is not responding

Try reloading the window with Ctrl+Shift+P > Developer: Reload Window. If issues persist, disable and re-enable the GitHub Copilot extension in your IDE settings.

Prices mentioned in this guide are pulled from current plan data and may change. Always verify on the official GitHub Copilot website before purchasing.

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