🚀 ErrGuard: A DevOps CLI That Explains Terminal Errors Using GitHub Copilot CLI

This is a submission for the GitHub Copilot CLI Challenge

As a DevOps learner, I spend most of my time inside the terminal. And like every beginner (and even experienced engineers), I frequently hit errors—Docker build failures, Git mistakes, Kubernetes connection issues, and permission problems.

The usual flow looks like this:

• Run a command


• See a confusing error


• Copy the error


• Google it


• Open multiple Stack Overflow tabs


• Lose time and context

I wanted to fix this problem inside the terminal itself.

That’s why I built ErrGuard.

🧩 What I Built

ErrGuard is a DevOps-focused CLI tool that wraps terminal commands and explains failures using GitHub Copilot CLI.

Instead of running:

docker build .

You run:

errguard docker build .

If the command succeeds, ErrGuard stays silent.

If it fails, ErrGuard:

1. Detects the failure


2. Captures the exact error output


3. Sends the error and command context to GitHub Copilot CLI


4. Returns a clear explanation:

• What happened


• Why it happened


• What went wrong


• Step-by-step fix


• How to avoid it next time

This turns terminal errors into learning moments.

🎬 Demo

🔗 GitHub Repository:

https://github.com/yashsonawane25/errguard.git

📸 Screenshot Demo:

First Image

Second Image

Real Example: Docker Build Failure

I ran the following command inside the ErrGuard directory:

errguard docker build .

Docker failed because there was no Dockerfile in the directory.

ErrGuard captured the real error output and passed it to GitHub Copilot CLI. Copilot analyzed the project context and returned a mentor-style explanation describing:

• Why Docker failed


• What mistake was made


• How to fix it


• How to avoid the issue in the future

All of this happened directly in the terminal, without switching to a browser.

🤖 My Experience with GitHub Copilot CLI

GitHub Copilot CLI is the core engine behind ErrGuard.

Instead of using Copilot only for autocomplete or IDE suggestions, I used the new standalone Copilot CLI as an intelligent agent that reasons about:

• The command that failed


• The actual error output


• The current working directory

ErrGuard sends structured prompts to Copilot CLI in non-interactive mode:

copilot -p "Explain this terminal error and how to fix it" --allow-all

Copilot then:

• Inspects the directory


• Understands the DevOps context


• Explains the root cause


• Suggests exact fixes

This significantly improved my debugging speed and helped me understand DevOps concepts more deeply.

🛠️ What I Learned

While building ErrGuard, I learned several real-world lessons:

• The older gh copilot extension was deprecated


• GitHub introduced a new standalone Copilot CLI


• Copilot CLI works best as an agent using prompts


• Authentication and permissions matter in real CLI tools

Adapting ErrGuard to these changes was an important part of the project.

💡 Why ErrGuard Matters

For DevOps learners:

• Errors are frequent


• Documentation is scattered


• Context switching slows learning

ErrGuard keeps you focused inside the terminal and turns errors into clear, actionable guidance.

🏁 Final Thoughts

Building ErrGuard helped me experience GitHub Copilot CLI as part of a real DevOps workflow—not just a demo tool.

Instead of fighting terminal errors, I now learn from them.

Thanks for reading 🙌

🏷️ Tags

#githubcopilot #cli #devops #automation #ai