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AI / GitHub Copilot CLI Fundamentals Interview Questions

What are common Copilot CLI troubleshooting steps and how do you debug issues?

When Copilot CLI behaves unexpectedly - authentication errors, tool failures, or unexpected responses - a structured set of checks resolves most issues.

Common issues and fixes
SymptomLikely causeFix
'Not authenticated' errorNo valid token foundRun copilot and complete /login, or set COPILOT_GITHUB_TOKEN
'Organisation policy' errorCLI not enabled for your orgAsk org admin to enable Copilot CLI in org settings
Classic PAT rejectedghp_ tokens are not supportedUse a fine-grained PAT with Copilot Requests permission
Copilot ignores project contextNo copilot-instructions.mdRun /init to generate the file
Session crashes on large repoContext window exceededUse targeted prompts; guide Copilot to specific files
Trust prompt on every launch'Yes for this session' selectedReselect 'Yes, remember this folder' to persist trust
/mcp server not connectingMCP server config incorrectCheck /mcp and review server connection settings
Outdated model / responses seem offOld version of Copilot CLInpm update -g @github/copilot
# Common diagnostic commands
copilot --version               # check installed version
copilot -p "hello" -s           # quick test of auth + model

# Update Copilot CLI
npm update -g @github/copilot

# Re-authenticate
copilot
/logout
/login

# Check which token is being used
echo $COPILOT_GITHUB_TOKEN
echo $GH_TOKEN

For persistent issues, GitHub's Copilot CLI documentation includes a dedicated troubleshooting section, and you can open GitHub Support tickets for plan or policy-related authentication failures.

What is the correct way to update GitHub Copilot CLI to the latest version when installed via npm?
A developer gets an authentication error despite having a Copilot subscription. Which token type issue is most likely the cause?

More Related questions...

What is GitHub Copilot CLI and how does it differ from the deprecated gh copilot extension? What are the prerequisites for installing GitHub Copilot CLI? How do you install GitHub Copilot CLI? How do you authenticate GitHub Copilot CLI and what token types are supported? What is the directory trust model in GitHub Copilot CLI and why does it exist? How do you start an interactive Copilot CLI session and what are the two main usage modes? What are slash commands in GitHub Copilot CLI and what are the most important ones? What are the operating modes in GitHub Copilot CLI and how do you switch between them? What is the copilot-instructions.md file and how does it affect Copilot CLI behaviour? How does model selection work in GitHub Copilot CLI? What is the /pr slash command in GitHub Copilot CLI and what can it do? What is the /fleet slash command and what problem does it solve? What is remote control in GitHub Copilot CLI and how does it work? What are Copilot CLI hooks and what can they be used for? What is the AGENTS.md file and how does it differ from copilot-instructions.md? What is the /chronicle slash command and what session history features does it provide? What is MCP (Model Context Protocol) support in Copilot CLI and how do you use it? What is the COPILOT_HOME environment variable and where does Copilot CLI store its config? What are experimental features in Copilot CLI and how do you enable them? What is AI Credits billing in GitHub Copilot CLI and how does it work? How does Copilot CLI read and understand repository context? What are the keyboard shortcuts available in an interactive Copilot CLI session? What is the difference between GitHub Copilot CLI and Copilot in VS Code? What is GitHub Copilot Workspace and how does it differ from Copilot CLI? What are common Copilot CLI troubleshooting steps and how do you debug issues? How does Copilot CLI differ between Copilot Individual, Business, and Enterprise plans? How do you use Copilot CLI effectively with private repositories? What are best practices for writing effective prompts in GitHub Copilot CLI? How can you use GitHub Copilot CLI in CI/CD pipelines and automation workflows? What security considerations should developers be aware of when using GitHub Copilot CLI? What is the --delegate flag and how does the /delegate slash command work? What logging and diagnostic capabilities does GitHub Copilot CLI provide? What does GitHub Copilot CLI's diff and undo capability provide? What are the Windows-specific considerations for GitHub Copilot CLI? What is the full list of GitHub Copilot CLI command-line flags and their purposes? How does GitHub Copilot CLI integrate with GitHub issues? What are the key differences when using Copilot CLI on macOS vs Linux? What is the overall workflow for using Copilot CLI on a real development task from start to finish?
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